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INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Amortized Cost, Held to maturity $ 2,492 $ 2,760
Fair Value    
Fair Value, Held to maturity 2,557 2,827
Amortized Cost    
One to five years 47,993 37,997
Five to ten years 15,000  
After ten years 16,909  
Amortized Cost, total 79,902 37,997
Amortized Cost, Available-for-sale Securities 483,575 262,749
Fair Value    
One to five years 47,092 37,916
Five to ten years 14,631  
After ten years 16,070  
Fair Value, total 77,793 37,916
Fair Value, Available-for-sale Securities 479,988 266,096
AFS securities pledged to secure customer deposit 0 0
Residential mortgage-backed securities    
Amortized Cost    
Amortized Cost, Held to maturity 2,492 2,760
Fair Value    
Fair Value, Held to maturity 2,557 2,827
Amortized Cost    
Amortized Cost, Available-for-sale Securities 368,776 192,163
Fair Value    
Fair Value, Available-for-sale Securities 366,770 194,688
Commercial mortgage-backed securities    
Amortized Cost    
Amortized Cost, Available-for-sale Securities 29,895 32,589
Fair Value    
Fair Value, Available-for-sale Securities 30,452 $ 33,492
Securities issued by states and political subdivisions in the U.S    
Amortized Cost    
Amortized Cost, Available-for-sale Securities 5,002  
Fair Value    
Fair Value, Available-for-sale Securities $ 4,973