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Securities - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
debt_security
bonds
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0   $ 0  
Transferred Securities, Unrealized Loss, Before Tax 111,500,000   113,500,000  
Securities transferred, Unrealized Loss, Net of Tax 88,100,000   89,700,000  
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 (18,000) $ (2,146,000)    
Gross realized gains on AFS securities 61,000 3,300,000    
Gross realized losses on AFS securities 79,000 1,100,000    
Equity investments 9,554,000   9,691,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Sale of HTM portfolio 0 0    
Interest receivable 39,716,000   50,489,000  
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 396      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 469,373,000 310,492,000 560,510,000 $ 199,252,000
Less: Net gains recognized during the period on equity investments sold during the period 0 2,416,000    
Debt Securities, Available-for-Sale, Accrued Interest 9,800,000   15,400,000  
Debt Securities, Held-to-Maturity, Accrued Interest $ 8,400,000   13,700,000  
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bonds 3      
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) $ 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 $ 0    
Asset Pledged as Collateral        
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Debt Securities 2,310,000,000   2,280,000,000  
Asset Pledged As Collateral, Excess Amount        
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Debt Securities 251,900,000   213,100,000  
Financial Asset, Past Due        
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]        
Securities held to maturity (estimated fair value of $138,879) $ 0   $ 0