v3.25.2
AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 518,154 $ 515,516
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 748 9
Gross Unrealized Losses 18,342 26,496
AFS securities 500,560 489,029
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 210,588 230,807
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 6,282 10,236
AFS securities 204,306 220,571
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 72,933 81,135
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 9
Gross Unrealized Losses 4,617 4,576
AFS securities 68,320 76,568
Auction Rate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,200 3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 435 156
AFS securities 2,765 3,044
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 26,093 29,068
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 1,436 2,182
AFS securities 24,657 26,886
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 197,190 163,156
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 744 0
Gross Unrealized Losses 4,694 8,482
AFS securities 193,240 154,674
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 8,150 8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 878 864
AFS securities $ 7,272 $ 7,286