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Debt Securities Held-to-Maturity (Tables)
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary Of Mortgage-Backed Securities Held-to-Maturity
The following is a summary of mortgage-backed securities held-to-maturity at December 31, 2021 and 2020 (in thousands): 
 December 31, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:    
GSEs$5,283 $192 $— $5,475 
Total securities held-to-maturity$5,283 $192 $— $5,475 

 December 31, 2020
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:
GSEs$7,234 $340 $— $7,574 
Total securities held-to-maturity$7,234 $340 $— $7,574