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Securities - Narrative (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Debt and Equity Securities, FV-NI [Line Items]          
Private mortgage-backed security fair value     $ 700,000 $ 700,000  
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position [Extensible Enumeration]     Accrued interest receivable Accrued interest receivable  
Accrued interest on available for sale debt securities     $ 5,200,000 $ 4,600,000  
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss, statement of financial position [Extensible Enumeration]     Accrued interest receivable Accrued interest receivable  
Accrued interest on held to maturity debt securities     $ 4,200,000 $ 4,200,000  
Number of securities | security     573 584  
Number of securities in an unrealized loss position | security     491 560  
Investment securities, pledged as collateral for public deposits     $ 730,400,000    
Proceeds from sales of securities available for sale     464,652,000 $ 385,125,000 $ 111,863,000
Securities losses, net     (71,600,000) (41,500,000)  
Equity securities, FV-NI, realized gain (loss)       4,500,000  
Proceeds from maturities, calls and principal repayments of securities available for sale   $ 5,200,000 216,476,000 243,029,000 $ 165,358,000
Securities losses, net   $ (1,000,000.0) 0    
FHLB stock and FRB stock, cost     41,600,000 41,300,000  
FHLB, cost     8,500,000    
FRB stock     33,100,000 32,700,000  
Common Class B          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, FV-NI, realized gain (loss) $ 4,500,000        
Carrying value of shares $ 0        
Collateral For Public Deposits          
Debt and Equity Securities, FV-NI [Line Items]          
Investment securities, pledged as collateral for public deposits     876,800,000 806,000,000.0  
Collateral For FRB Borrowings          
Debt and Equity Securities, FV-NI [Line Items]          
Investment securities, pledged as collateral for public deposits     $ 622,100,000 $ 661,000,000.0