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Securities - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
bond
debt_security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
bond
debt_security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
debt_security
Schedule of Investments [Line Items]          
Transferred Securities, Unrealized Loss, Before Tax $ 98,900,000   $ 98,900,000   $ 105,100,000
Securities transferred, Unrealized Loss, Net of Tax 78,200,000   78,200,000   83,000,000.0
Fair value of securities transferred from AFS to HTM     0   0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Net gain (loss) on sale of securities AFS 24,395,000 $ 1,929,000 24,949,000 $ 2,510,000  
Net realized losses on AFS securities     (25,400,000) (6,100,000)  
Gross realized gains on AFS securities     2,000,000.0 88,000  
Proceeds from sale of AFS securities     411,502,000 126,248,000  
Equity investments 9,552,000   9,552,000   9,467,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Sale of HTM portfolio 0 0 0 0  
Interest receivable 35,413,000   35,413,000   $ 46,724,000
FHLB stock with other-than-temporary impairment 0   0    
Other-than-temporarily impaired equity investments $ 0   $ 0    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | debt_security 191   191   421
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)   0   0  
Less: Net gains recognized during the period on equity investments sold during the period $ 0 0 $ 0 0  
Debt Securities, Available-for-Sale, Accrued Interest 7,100,000   7,100,000   $ 13,600,000
Debt Securities, Held-to-Maturity, Accrued Interest $ 7,800,000   $ 7,800,000   12,900,000
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bond 2   2    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Nonaccrual $ 0   $ 0   0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,263,456,000   1,263,456,000   1,279,234,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0   0
Debt Securities, Available-for-Sale, Realized Loss, Sale Of Municipal Securities   685,000      
Debt Securities, Available-for-Sale, Sold at Par Value   10,000,000      
Debt Securities, Available-for-Sale, Realized Loss, Unwind Of Fair Value Hedges   183,000      
Debt Securities, Available-For-Sale Realized Loss, Impairment   $ 868,000      
State and political subdivisions          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)     55,000    
Gain (Loss) on Hedging Activity       $ 3,500,000  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,042,425,000   1,042,425,000   1,040,912,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0   0
Corporate bonds and other          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) 0        
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 112,668,000   112,668,000   124,095,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0   0
MBS And Municipal Sercurities          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Gain (Loss) on Hedging Activity     (1,500,000)    
Asset Pledged as Collateral          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Debt Securities 1,950,000,000   1,950,000,000   2,180,000,000
Asset Pledged As Collateral, Excess Amount          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Debt Securities 382,200,000   382,200,000   431,700,000
Financial Asset, Past Due          
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]          
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 0   $ 0   $ 0