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Investment Securities - Securities Available for Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Securities available for sale, less than 12 months, fair value $ 131,670 $ 89,258
Securities available for sale, 12 months or longer, fair value 0 24,804
Securities available for sale, fair value 131,670 114,062
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (773) (501)
Securities available for sale, 12 months or longer, unrealized losses 0 (167)
Securities available for sale, unrealized losses (773) (668)
Obligations of the U.S. government and agencies    
Fair Value    
Securities available for sale, less than 12 months, fair value 19,777 48,497
Securities available for sale, 12 months or longer, fair value 0 7,966
Securities available for sale, fair value 19,777 56,463
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (219) (315)
Securities available for sale, 12 months or longer, unrealized losses 0 (37)
Securities available for sale, unrealized losses (219) (352)
Mortgage-backed securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 79,990 33,783
Securities available for sale, 12 months or longer, fair value 0 5,977
Securities available for sale, fair value 79,990 39,760
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (457) (119)
Securities available for sale, 12 months or longer, unrealized losses 0 (38)
Securities available for sale, unrealized losses (457) (157)
Collateralized mortgage obligations    
Fair Value    
Securities available for sale, less than 12 months, fair value 31,903 6,978
Securities available for sale, 12 months or longer, fair value 0 10,861
Securities available for sale, fair value 31,903 17,839
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (97) (67)
Securities available for sale, 12 months or longer, unrealized losses 0 (92)
Securities available for sale, unrealized losses $ (97) $ (159)