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Securities - Narrative (Details)
 6 Months Ended
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 1,631,953,000   $ 1,549,589,000
Estimated fair values 1,522,611,000   1,432,371,000
Tax benefit (provision) on net realized gains and losses (8,200) $ (128,700)  
Allowance for credit loss on available for sale debt securities $ 0   0
Securities unrealized loss | security 528    
Impairment existed based on a combination of factors $ 0    
Investment in federal home loan bank 26,800,000   18,200,000
Investment in federal reserve bank 14,800,000   14,800,000
Restricted stock, at cost 42,189,000   33,559,000
Asset Pledged as Collateral      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost 1,100,000,000   1,200,000,000
Estimated fair values 1,000,000,000.0   1,100,000,000
Community Bankers' Bank      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Restricted stock, at cost 111,000   111,000
U.S. Treasuries and government agencies      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost 164,859,000   165,619,000
Estimated fair values $ 153,345,000   149,127,000
Securities in unrealized loss positions | security 11    
Residential mortgage backed - agency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 58,174,000   57,244,000
Estimated fair values $ 55,137,000   53,186,000
Securities in unrealized loss positions | security 12    
Commercial mortgage backed - agency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Securities in unrealized loss positions | security 14    
State and Municipal Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Securities in unrealized loss positions | security 386    
Residential mortgage backed - non-agency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 240,055,000   259,964,000
Estimated fair values $ 233,004,000   247,876,000
Securities in unrealized loss positions | security 61    
Commercial mortgage backed - non-agency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 132,095,000   158,621,000
Estimated fair values $ 130,108,000   154,511,000
Securities in unrealized loss positions | security 16    
Asset-backed      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 57,268,000   64,308,000
Estimated fair values $ 56,426,000   64,056,000
Securities in unrealized loss positions | security 20    
Other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost $ 32,076,000   32,861,000
Estimated fair values $ 31,009,000   $ 31,820,000
Securities in unrealized loss positions | security 8