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Securities - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
debt_security
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
debt_security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]            
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0   $ 0   $ 0  
Transferred Securities, Unrealized Loss, Before Tax 115,600,000   115,600,000   121,500,000  
Securities transferred, Unrealized Loss, Net of Tax 91,300,000   91,300,000   96,000,000  
Fair value of securities transferred from AFS to HTM     0   1,250,000,000  
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]            
Net gain (loss) on sale of securities AFS 11,000 $ (99,000) (5,590,000) $ (3,819,000)    
Gross realized gains on AFS securities     1,400,000 584,000    
Gross realized losses on AFS securities     7,000,000 4,400,000    
Equity investments 9,454,000   9,454,000   11,181,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]            
Sale of HTM portfolio 0 0 0 0    
Interest receivable 39,646,000   39,646,000   49,350,000  
Debt Securities, Held-to-maturity, Nonaccrual 0   0   0  
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 585   585      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 325,823,000 195,127,000 $ 325,823,000 195,127,000 199,252,000 $ 201,753,000
Less: Net gains recognized during the period on equity investments sold during the period 0 0 5,058,000 0    
Debt Securities, Available-for-Sale, Accrued Interest 10,800,000   10,800,000   16,900,000  
Debt Securities, Held-to-Maturity, Accrued Interest 8,500,000   8,500,000   13,600,000  
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 2,480,000,000   2,480,000,000   1,820,000,000  
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