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Securities - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
bonds
debt_security
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
bonds
debt_security
Sep. 30, 2023
USD ($)
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 107,300,000   107,300,000   113,500,000  
Securities transferred, Unrealized Loss, Net of Tax 84,800,000   84,800,000   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 (1,929,000) $ 11,000 (2,510,000) $ (5,590,000)    
Gross realized losses on AFS securities     6,100,000 1,400,000    
Realized loss, impairment 868,000          
Realized loss, sale of municipal securities 685,000          
Realized loss, unwind of fair value hedges 183,000          
Gross realized gains on AFS securities     88,000 7,000,000.0    
Proceeds from sale of AFS securities     126,248,000 747,434,000    
Sold at par value 10,000,000          
Equity investments 9,722,000   9,722,000   9,691,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Sale of HTM portfolio 0 0 0 0    
Interest receivable 37,888,000   37,888,000   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 271   271      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 486,297,000 325,823,000 $ 486,297,000 325,823,000 560,510,000 $ 199,252,000
Less: Net gains recognized during the period on equity investments sold during the period 0 0 0 5,058,000    
Debt Securities, Available-for-Sale, Accrued Interest 8,400,000   8,400,000   15,400,000  
Debt Securities, Held-to-Maturity, Accrued Interest $ 8,200,000   $ 8,200,000   13,700,000  
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bonds 2   2      
Gain (Loss) on Hedging Activity     $ 3,500,000   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 2,100,000,000   2,100,000,000   2,280,000,000  
Asset Pledged As Collateral, Excess Amount            
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Debt Securities 352,600,000   352,600,000   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