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Securities - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Investments, Debt and Equity Securities [Abstract]          
Securities $ 764,600,000   $ 764,600,000    
Securities AFS 636,679,000   636,679,000   $ 550,148,000
Unrealized loss for debt securities     16,200,000    
Accumulated unrealized loss on AFS securities (47,000,000)   (47,000,000)    
Securities available-for-sale, at amortized cost 124,853,000   124,853,000   131,796,000
Payments to acquire investments     146,700,000    
Maturities, principal repayments, and calls     83,500,000    
Securities sold     0    
Debt securities, held-to-maturity, sale     0    
Debt securities, held-to-maturity, purchase     0    
Available-for-sale, allowance for credit loss 0   0   0
Held-to-maturity, allowance for credit loss 0   0   0
Accrued interest receivables, available for sale and held to maturity securities $ 3,200,000   $ 3,200,000   3,000,000
Available-for-sale, number of securities in unrealized loss positions | security 442   442    
Securities in a loss position as a proportion of AFS securities (as a percent) 7.18%   7.18%    
Proceeds from sale of debt securities $ 0 $ 0 $ 0 $ 0  
Equity securities, at fair value 3,019,000   3,019,000   2,937,000
Gain (Loss) on equity securities 28,000 $ 107,000 82,000 $ 63,000 (28,000)
Securities pledged as collateral $ 219,700,000   $ 219,700,000   $ 226,500,000