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Debt Securities Available-for-Sale (Tables)
6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Comparative Summary of Mortgage-Backed Securities and Other Securities Available-for-Sale
The following is a comparative summary of mortgage-backed securities and other debt securities available-for-sale at June 30, 2022, and December 31, 2021 (in thousands):
 June 30, 2022
  GrossGrossEstimated
 Amortizedunrealizedunrealizedfair
 costgainslossesvalue
U.S. Government agency securities$76,572 $— $(1,769)$74,803 
Mortgage-backed securities:
Pass-through certificates:    
Government sponsored enterprises ("GSEs")538,676 49 (25,299)513,426 
Real estate mortgage investment conduits ("REMICs"):    
GSE317,266 — (9,453)307,813 
 855,942 49 (34,752)821,239 
Other debt securities:    
Municipal bonds52 — — 52 
Corporate bonds197,818 22 (7,066)190,774 
197,870 22 (7,066)190,826 
Total debt securities available-for-sale$1,130,384 $71 $(43,587)$1,086,868 
 December 31, 2021
  GrossGrossEstimated
 Amortizedunrealizedunrealizedfair
 costgainslossesvalue
U.S. Government agency securities$2,344 $— $(54)$2,290 
Mortgage-backed securities: 
Pass-through certificates: 
GSE579,035 5,233 (2,862)581,406 
REMICs: 
GSE390,755 2,398 (1,443)391,710 
 969,790 7,631 (4,305)973,116 
Other debt securities:
Municipal bonds71 — 72 
Corporate bonds233,311 192 (744)232,759 
233,382 193 (744)232,831 
Total debt securities available-for-sale$1,205,516 $7,824 $(5,103)$1,208,237 
Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other Than Mortgage-Backed Securities
The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at June 30, 2022 (in thousands):
Available-for-saleAmortized costEstimated fair value
Due in one year or less$159,755 $156,465 
Due after one year through five years113,115 107,719 
Due after five years through ten years1,572 1,445 
 $274,442 $265,629 
Gross Unrealized Losses on Mortgage-Backed Securities
Gross unrealized losses on mortgage-backed securities and other debt securities available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2022 and December 31, 2021, were as follows (in thousands):

 June 30, 2022
 Less than 12 months12 months or moreTotal
 UnrealizedEstimatedUnrealizedEstimatedUnrealizedEstimated
 lossesfair valuelossesfair valuelossesfair value
U.S. Government agency securities$(1,642)$73,358 $(127)$1,444 $(1,769)$74,802 
Mortgage-backed securities:
Pass-through certificates:      
GSE(24,602)490,569 (668)7,927 (25,270)498,496 
REMICs:      
GSE(6,077)246,515 (3,405)60,905 (9,482)307,420 
Other debt securities:      
Corporate bonds(5,368)159,665 (1,698)13,312 (7,066)172,977 
Total$(37,689)$970,107 $(5,898)$83,588 $(43,587)$1,053,695 


 December 31, 2021
 Less than 12 months12 months or moreTotal
 UnrealizedEstimatedUnrealizedEstimatedUnrealizedEstimated
 lossesfair valuelossesfair valuelossesfair value
U.S. Government agency securities$— $— $(54)$2,290 $(54)$2,290 
Mortgage-backed securities:      
Pass-through certificates:      
GSE(2,543)417,291 (318)14,625 (2,861)431,916 
REMICs:      
GSE(1,350)125,725 (94)4,413 (1,444)130,138 
Other debt securities:
Corporate bonds(744)146,853 — — (744)146,853 
Total$(4,637)$689,869 $(466)$21,328 $(5,103)$711,197 
Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2022 were as follows (in thousands):

 June 30, 2022
 Less than 12 months12 months or moreTotal
 UnrealizedEstimatedUnrealizedEstimatedUnrealizedEstimated
 lossesfair valuelossesfair valuelossesfair value
Mortgage-backed securities:      
Pass-through certificates:      
GSE$(224)$4,977 $— $— $(224)$4,977 
Total$(224)$4,977 $— $— $(224)$4,977