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, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses at beginning of period $ (6,958) $ (14,238) $ (22,528)
Additions on securities for which credit losses were not previously recorded (425) (983) (4,555)
Increase (decrease) on securities with previously recorded credit losses 970 (1,747) (5,208)
Writeoffs 2,470 10,010 18,053
Allowance for credit losses at end of period (3,943) (6,958) (14,238)
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 (6,785) (12,851) (17,889)
Additions on securities for which credit losses were not previously recorded (55) (482) (190)
Increase (decrease) on securities with previously recorded credit losses 965 (3,462) (4,542)
Writeoffs 2,256 10,010 9,770
Allowance for credit losses at end of period (3,619) (6,785) (12,851)
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 (173) (1,387) (4,639)
Additions on securities for which credit losses were not previously recorded (370) (501) (4,365)
Increase (decrease) on securities with previously recorded credit losses 5 1,715 (666)
Writeoffs 214 0 8,283
Allowance for credit losses at end of period $ (324) $ (173) $ (1,387)