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Securities - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
bond
debt_security
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
debt_security
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]        
Transferred Securities, Unrealized Loss, Before Tax $ 103,100,000   $ 105,100,000  
Securities transferred, Unrealized Loss, Net of Tax 81,400,000   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 (554,000) $ (18,000)    
Gross realized losses on AFS securities (1,200,000) 79,000    
Gross realized gains on AFS securities 600,000 61,000    
Proceeds from sale of AFS securities 120,242,000 917,000    
Equity investments 9,458,000   9,467,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Sale of HTM portfolio 0 0    
Interest receivable 36,245,000   $ 46,724,000  
FHLB stock with other-than-temporary impairment 0      
Other-than-temporarily impaired equity investments $ 0      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | debt_security 361   421  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 430,971,000 469,373,000 $ 426,161,000 $ 560,510,000
Less: Net gains recognized during the period on equity investments sold during the period 0 0    
Debt Securities, Available-for-Sale, Accrued Interest 8,300,000   13,600,000  
Debt Securities, Held-to-Maturity, Accrued Interest $ 8,000,000.0   12,900,000  
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bond 2      
Gain (Loss) on Hedging Activity $ (1,200,000)      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Nonaccrual 0   0  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,278,394,000   1,279,234,000  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0  
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) 64,000 0    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,041,455,000   1,040,912,000  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 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) 64,000 $ 0    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 124,256,000   124,095,000  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0  
Asset Pledged as Collateral        
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Debt Securities 2,230,000,000   2,180,000,000  
Asset Pledged As Collateral, Excess Amount        
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Debt Securities 425,200,000   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