Annual report pursuant to Section 13 and 15(d)

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

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Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period $ (22,528)  
Additions on securities for which credit losses were not previously recorded (4,555) $ (44,359)
Reductions for securities sold 0 246,792
Increase (decrease) on securities with previously recorded credit losses (5,208) (14,081)
Writeoffs 18,053 36,531
Recoveries of amounts previously written off 0 (2,535)
Allowance for credit losses at end of period (14,238) (22,528)
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 (17,889)  
Additions on securities for which credit losses were not previously recorded (190) (32,931)
Reductions for securities sold 0 0
Increase (decrease) on securities with previously recorded credit losses (4,542) 385
Writeoffs 9,770 14,657
Recoveries of amounts previously written off 0 0
Allowance for credit losses at end of period (12,851) (17,889)
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 (4,639)  
Additions on securities for which credit losses were not previously recorded (4,365) (11,428)
Reductions for securities sold 0 246,792
Increase (decrease) on securities with previously recorded credit losses (666) (14,466)
Writeoffs 8,283 21,874
Recoveries of amounts previously written off 0 (2,535)
Allowance for credit losses at end of period $ (1,387) $ (4,639)