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Investment Securities, Amortized Cost, Unrealized Gains and Losses, Estimated Fair Values and Related Allowance for Credit Losses on Investments in Debt and Other Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investment securities available-for-sale [Abstract]    
Amortized cost $ 620,314 $ 683,784
Unrealized gains 733 102
Unrealized losses (48,690) (65,794)
Estimated fair value 572,357 618,092
ACL 0 0
Gross realized gains from sales of available-for-sale securities 96 0
Gross realized losses from sales of available-for-sale securities 208 152
U.S. Treasury Securities [Member]    
Investment securities available-for-sale [Abstract]    
Amortized cost 90,063 119,644
Unrealized gains 134 13
Unrealized losses (3,015) (5,842)
Estimated fair value 87,182 113,815
ACL 0  
Securities of U.S. Government Agencies and Corporations [Member]    
Investment securities available-for-sale [Abstract]    
Amortized cost 121,305 128,697
Unrealized gains 105 20
Unrealized losses (6,331) (9,806)
Estimated fair value 115,079 118,911
ACL 0  
Obligations of States and Political Subdivisions [Member]    
Investment securities available-for-sale [Abstract]    
Amortized cost 55,021 58,955
Unrealized gains 237 13
Unrealized losses (3,581) (5,642)
Estimated fair value 51,677 53,326
ACL 0  
Collateralized Mortgage Obligations [Member]    
Investment securities available-for-sale [Abstract]    
Amortized cost 107,658 114,983
Unrealized gains 15 0
Unrealized losses (16,726) (19,633)
Estimated fair value 90,947 95,350
ACL 0  
Mortgage-backed Securities [Member]    
Investment securities available-for-sale [Abstract]    
Amortized cost 246,267 261,505
Unrealized gains 242 56
Unrealized losses (19,037) (24,871)
Estimated fair value 227,472 $ 236,690
ACL $ 0