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Held-to-Maturity Securities Major Security Types (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 947,142 $ 1,424,176
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss (76,035) (129,153)
Carrying Value [1],[2] 871,107 1,295,023
Gross Unrecognized Holding Gains 168,842 242,834
Gross Unrecognized Holding Losses (4,539) (8,928)
Held-to-maturity securities Fair Value 1,035,410 1,528,929
U.S. agency obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   208
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss   0
Carrying Value   208
Gross Unrecognized Holding Gains   0
Gross Unrecognized Holding Losses   0
Held-to-maturity securities Fair Value   208
HFA securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 87,250 104,465
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss 0 0
Carrying Value 87,250 104,465
Gross Unrecognized Holding Gains 0 4
Gross Unrecognized Holding Losses (3,845) (4,612)
Held-to-maturity securities Fair Value 83,405 99,857
Other Than Mortgage-backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 87,250 104,673
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss   0
Carrying Value [1] 87,250 104,673
Gross Unrecognized Holding Gains   4
Gross Unrecognized Holding Losses   (4,612)
Held-to-maturity securities Fair Value 83,405 100,065
U.S. government-guaranteed - single-family MBS [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 6,987 8,173
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss 0 0
Carrying Value 6,987 8,173
Gross Unrecognized Holding Gains 129 158
Gross Unrecognized Holding Losses 0 0
Held-to-maturity securities Fair Value 7,116 8,331
GSEs – MBS [Member] | GSEs - single-family [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 303,604 412,639
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss 0 0
Carrying Value 303,604 412,639
Gross Unrecognized Holding Gains 5,197 6,861
Gross Unrecognized Holding Losses (246) (1,389)
Held-to-maturity securities Fair Value 308,555 418,111
GSEs – MBS [Member] | GSEs - multifamily [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 140,661 209,786
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss 0 0
Carrying Value 140,661 209,786
Gross Unrecognized Holding Gains 612 1,728
Gross Unrecognized Holding Losses (2) 0
Held-to-maturity securities Fair Value 141,271 211,514
Private-label residential [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 408,640 688,905
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss (76,035) (129,153)
Carrying Value 332,605 559,752
Gross Unrecognized Holding Gains 162,904 234,083
Gross Unrecognized Holding Losses (446) (2,927)
Held-to-maturity securities Fair Value 495,063 790,908
MBS [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost [3] 859,892 1,319,503
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss (76,035) (129,153)
Carrying Value [1],[3] 783,857 1,190,350
Gross Unrecognized Holding Gains 168,842 242,830
Gross Unrecognized Holding Losses (694) (4,316)
Held-to-maturity securities Fair Value [3] $ 952,005 $ 1,428,864
[1]
Carrying value of held-to-maturity securities represents the sum of amortized cost and the amount of noncredit-related other-than-temporary impairment recognized in accumulated other comprehensive loss.
[2] Fair values of held-to-maturity securities were $1,035,410 and $1,528,929 at December 31, 2019 and 2018, respectively.
[3]
MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers of the underlying loans may have the right to call or prepay their obligations with or without call or prepayment fees.