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Debt Securities Held-to-Maturity (Tables)
6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Securities Held-to-Maturity
The following is a summary of mortgage-backed securities held-to-maturity at June 30, 2022 and December 31, 2021 (in thousands): 
 June 30, 2022
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:    
GSE$5,201 $— $(224)$4,977 
Total securities held-to-maturity$5,201 $— $(224)$4,977 
 December 31, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:    
GSE$5,283 $192 $— $5,475 
Total securities held-to-maturity$5,283 $192 $— $5,475 
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