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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 331,962 $ 281,606 $ 298,786
Unrealized Gains 10,288 5,590 7,925
Unrealized Losses (188) (151) (64)
Fair Value (Estimated) 342,062 287,045 306,647
U.S. Government-sponsored agencies      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 26,146 32,840 32,840
Unrealized Gains 294 47 93
Unrealized Losses 0 (26) 0
Fair Value (Estimated) 26,440 32,861 32,933
   Mortgage-backed securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 43,414 14,431 15,584
Unrealized Gains 844 450 502
Unrealized Losses (119) (16) (16)
Fair Value (Estimated) 44,139 14,865 16,070
   State and political subdivisions      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 245,152 219,585 236,612
Unrealized Gains 8,660 4,936 7,136
Unrealized Losses (69) (109) (48)
Fair Value (Estimated) 253,743 224,412 243,700
Corporate securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 17,250 14,750 13,750
Unrealized Gains 490 157 194
Unrealized Losses 0 0 0
Fair Value (Estimated) $ 17,740 $ 14,907 $ 13,944