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Investment Securities (Details) - Investments classified by maturity date - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities Available-for-Sale:    
Due in one year or less, amortized cost $ 4,439  
Due in one year or less, fair value 4,451  
Due after one year through five years, amortized cost 9,911  
Due after one year through five years, fair value 10,024  
Due after five years through ten years, amortized cost 7,777  
Due after five years through ten years, fair value 8,029  
Due after ten years, amortized cost 171,353  
Due after ten years, fair value 172,779  
Total, amortized cost 460,847 $ 477,326
Total, fair value 462,884 487,955
Residential mortgage pass-through securities [Member]    
Securities Available-for-Sale:    
Total, amortized cost 255,488 266,114
Total, fair value 256,055 270,884
Commercial mortgage pass-through securities [Member]    
Securities Available-for-Sale:    
Total, amortized cost 10,859 6,906
Total, fair value 10,526 6,922
Other securities [Member]    
Securities Available-for-Sale:    
Total, amortized cost 1,020 157
Total, fair value $ 1,020 $ 157