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Securities - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
debt_security
bonds
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
debt_security
bonds
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]            
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0   $ 0   $ 0  
Transferred Securities, Unrealized Loss, Before Tax 109,500,000   109,500,000   113,500,000  
Securities transferred, Unrealized Loss, Net of Tax 86,500,000   86,500,000   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 (563,000) $ (3,455,000) (581,000) $ (5,601,000)    
Gross realized gains on AFS securities     88,000 7,000,000.0    
Gross realized losses on AFS securities     4,600,000 1,400,000    
Equity investments 9,531,000   9,531,000   9,691,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Sale of HTM portfolio 0 0        
Interest receivable 50,393,000   50,393,000   50,489,000  
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 417   417      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 451,996,000 207,113,000 $ 451,996,000 207,113,000 560,510,000 $ 199,252,000
Less: Net gains recognized during the period on equity investments sold during the period 0 2,642,000 0 5,058,000    
Debt Securities, Available-for-Sale, Accrued Interest 14,200,000   14,200,000   15,400,000  
Debt Securities, Held-to-Maturity, Accrued Interest $ 13,700,000   $ 13,700,000   13,700,000  
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bonds 3   3      
Gain (Loss) on Hedging Activity     $ 4,000,000.0   6,500,000  
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) $ 0 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 $ 0 0 $ 0    
Asset Pledged as Collateral            
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Debt Securities 2,110,000,000   2,110,000,000   2,280,000,000  
Asset Pledged As Collateral, Excess Amount            
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Debt Securities 377,400,000   377,400,000   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   $ 0