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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]      
Amortized Cost $ 381,906 $ 370,040 $ 375,699
Unrealized Gains 86 8,599 8,037
Unrealized Losses (68,196) (3,312) (3,939)
Fair Value (Estimated) 313,796 375,327 379,797
Equity Securities, Restricted [Abstract]      
Federal Home Loan Bank Stock 3,477 4,328 7,802
Federal Reserve Bank Stock 1,037 1,037 1,037
Restricted equity securities 4,514 5,365 8,839
U.S. Government-sponsored agencies      
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]      
Amortized Cost 38,100 35,600 35,600
Unrealized Gains 0 2 17
Unrealized Losses (10,428) (1,149) (1,161)
Fair Value (Estimated) 27,672 34,453 34,456
   Mortgage-backed securities      
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]      
Amortized Cost 56,423 60,646 64,651
Unrealized Gains 48 261 354
Unrealized Losses (11,784) (1,795) (1,701)
Fair Value (Estimated) 44,687 59,112 63,304
   State and political subdivisions      
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]      
Amortized Cost 257,633 250,544 254,198
Unrealized Gains 38 7,925 7,251
Unrealized Losses (43,899) (302) (1,042)
Fair Value (Estimated) 213,772 258,167 260,407
Corporate securities      
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]      
Amortized Cost 29,750 23,250 21,250
Unrealized Gains 0 411 415
Unrealized Losses (2,085) (66) (35)
Fair Value (Estimated) $ 27,665 $ 23,595 $ 21,630