Quarterly report pursuant to Section 13 or 15(d)

Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details)

v3.21.2
Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period $ (17,765) $ (42,583) $ (22,528)  
Additions on securities for which credit losses were not previously recorded (26) (86) (3,907) $ (44,286)
Reductions for securities sold   0   246,792
Increase (decrease) on securities with previously recorded credit losses (133) (7,014) (2,509) (9,645)
Writeoffs 2,495 24,188 13,515 29,055
Recoveries of amounts previously written off   0   (2,535)
Allowance for credit losses at end of period (15,429) (25,495) (15,429) (25,495)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period (15,154) (30,634) (17,889)  
Additions on securities for which credit losses were not previously recorded (26) (86) (57) (32,882)
Reductions for securities sold       0
Increase (decrease) on securities with previously recorded credit losses (1,156) (558) (3,293) 1,604
Writeoffs 2,336 12,037 7,239 12,037
Recoveries of amounts previously written off       0
Allowance for credit losses at end of period (14,000) (19,241) (14,000) (19,241)
Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period (2,611) (11,949) (4,639)  
Additions on securities for which credit losses were not previously recorded 0 0 (3,850) (11,404)
Reductions for securities sold       246,792
Increase (decrease) on securities with previously recorded credit losses 1,023 (6,456) 784 (11,249)
Writeoffs 159 12,151 6,276 17,018
Recoveries of amounts previously written off       (2,535)
Allowance for credit losses at end of period $ (1,429) $ (6,254) $ (1,429) $ (6,254)