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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS, HTM and Restricted Equity Securities (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Securities available for sale      
Amortized Cost $ 328,648,000 $ 332,148,000 $ 339,555,000
Unrealized Gains 119,000 310,000 84,000
Unrealized Losses (54,316,000) (50,405,000) (51,397,000)
Fair Value (Estimated) 274,451,000 282,053,000 288,242,000
Securities to be held to maturity      
Amortized Cost 379,635,000 385,669,000 392,283,000
Unrealized Gains 190,000 383,000 440,000
Unrealized Losses (52,009,000) (47,482,000) (48,670,000)
Fair Value (Estimated) 327,816,000 338,570,000 344,053,000
Less allowance for credit losses (182,000) (434,000) (438,000)
Net securities to be held to maturity 379,453,000 385,235,000 391,845,000
Restricted equity securities      
Federal Home Loan Bank Stock 4,896,000 2,348,000 2,837,000
Federal Reserve Bank Stock 1,037,000 1,037,000 1,037,000
Restricted equity securities 5,933,000 3,385,000 3,874,000
U.S. Treasury & Agency securities      
Securities available for sale      
Amortized Cost 26,036,000 26,033,000 26,027,000
Unrealized Gains 0 0 0
Unrealized Losses (6,343,000) (6,203,000) (6,509,000)
Fair Value (Estimated) 19,693,000 19,830,000 19,518,000
Securities to be held to maturity      
Amortized Cost 38,100,000 40,100,000 40,100,000
Unrealized Gains 0 0 0
Unrealized Losses (9,851,000) (9,601,000) (10,099,000)
Fair Value (Estimated) 28,249,000 30,499,000 30,001,000
Less allowance for credit losses 0    
   Mortgage-backed securities      
Securities available for sale      
Amortized Cost 259,538,000 262,823,000 269,730,000
Unrealized Gains 99,000 265,000 72,000
Unrealized Losses (41,635,000) (38,491,000) (38,711,000)
Fair Value (Estimated) 218,002,000 224,597,000 231,091,000
Securities to be held to maturity      
Amortized Cost 55,483,000 56,401,000 59,523,000
Unrealized Gains 15,000 70,000 75,000
Unrealized Losses (11,258,000) (10,398,000) (10,443,000)
Fair Value (Estimated) 44,240,000 46,073,000 49,155,000
   State and political subdivisions      
Securities available for sale      
Amortized Cost 40,288,000 40,306,000 40,451,000
Unrealized Gains 0 41,000 12,000
Unrealized Losses (6,338,000) (5,702,000) (6,114,000)
Fair Value (Estimated) 33,950,000 34,645,000 34,349,000
Securities to be held to maturity      
Amortized Cost 254,302,000 254,418,000 257,910,000
Unrealized Gains 175,000 313,000 365,000
Unrealized Losses (27,879,000) (24,213,000) (25,357,000)
Fair Value (Estimated) 226,598,000 230,518,000 232,918,000
Less allowance for credit losses (113,000) (222,000)  
Asset-backed securities      
Securities available for sale      
Amortized Cost 2,786,000 2,986,000 3,347,000
Unrealized Gains 20,000 4,000 0
Unrealized Losses 0 (9,000) (63,000)
Fair Value (Estimated) 2,806,000 2,981,000 3,284,000
Corporate securities      
Securities to be held to maturity      
Amortized Cost 31,750,000 34,750,000 34,750,000
Unrealized Gains 0 0 0
Unrealized Losses (3,021,000) (3,270,000) (2,771,000)
Fair Value (Estimated) 28,729,000 31,480,000 $ 31,979,000
Less allowance for credit losses $ (69,000) $ (212,000)