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Investments Held-to-Maturity Securities by Major Security Type (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] $ 733,647 $ 947,142
Allowance for Credit Losses (3,768) [2] 0
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] (52,991) (76,035)
Carrying Value [3],[4] 676,888 871,107
Gross Unrecognized Holding Gains 68,649 168,842
Gross Unrecognized Holding Loss (11,567) (4,539)
Fair Value 733,970 1,035,410
Held-to-maturity securities - accrued interest receivable 1,600 2,000
HFA securities [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] 79,680 87,250
Allowance for Credit Losses [2] 0  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] 0 0
Carrying Value 79,680 87,250
Gross Unrecognized Holding Gains 0 0
Gross Unrecognized Holding Loss (10,319) (3,845)
Fair Value 69,361 83,405
U.S. government-guaranteed - single-family MBS [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] 6,686 6,987
Allowance for Credit Losses [2] 0  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] 0 0
Carrying Value 6,686 6,987
Gross Unrecognized Holding Gains 76 129
Gross Unrecognized Holding Loss 0 0
Fair Value 6,762 7,116
Private-label [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] 275,069 408,640
Allowance for Credit Losses [2] (3,768)  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] (52,991) (76,035)
Carrying Value 218,310 332,605
Gross Unrecognized Holding Gains 62,591 162,904
Gross Unrecognized Holding Loss (738) (446)
Fair Value 280,163 495,063
MBS [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1],[5] 653,967 859,892
Allowance for Credit Losses [2] (3,768)  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] (52,991) (76,035)
Carrying Value [3],[5] 597,208 783,857
Gross Unrecognized Holding Gains 68,649 168,842
Gross Unrecognized Holding Loss (1,248) (694)
Fair Value [5] 664,609 952,005
GSE - single-family [Member] | Government Sponsored Enterprises [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] 281,285 303,604
Allowance for Credit Losses [2] 0  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] 0 0
Carrying Value 281,285 303,604
Gross Unrecognized Holding Gains 5,464 5,197
Gross Unrecognized Holding Loss (510) (246)
Fair Value 286,239 308,555
GSE - multifamily [Member] | Government Sponsored Enterprises [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost [1] 90,927 140,661
Allowance for Credit Losses [2] 0  
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss [2] 0 0
Carrying Value 90,927 140,661
Gross Unrecognized Holding Gains 518 612
Gross Unrecognized Holding Loss 0 (2)
Fair Value $ 91,445 $ 141,271
[1]
Amortized cost of held-to-maturity securities includes adjustments made to the cost basis of an investment for accretion, amortization, and collection of cash. Amortized cost excludes accrued interest receivable of $1.6 million and $2.0 million at March 31, 2020, and December 31, 2019.
[2]
With the adoption of changes to accounting standards on credit impairment on January 1, 2020, the other-than-temporary impairment approach was replaced with an allowance for credit loss; however, other-than-temporary impairment remains for those securities that had credit impairment prior to the adoption date. See Note 2 — Summary of Significant Accounting Policies and Note 3 — Recently Issued and Adopted Accounting Guidance for further information.
[3]
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 and the allowance for credit losses.
[4] Fair values of held-to-maturity securities were $733,970 and $1,035,410 at March 31, 2020, and December 31, 2019, respectively.
[5]
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.