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Investment Securities - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Jul. 07, 2023
USD ($)
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]                
Held-to-maturity, allowance for credit Loss     $ 0   $ 0     $ 0
Transfer of securities from available-for-sale to held-to-maturity at fair value   $ 357,500,000            
Net unrealized pre-tax loss     96,225,000   96,225,000     $ 90,543,000
Proceeds from sale of available-for-sale securities     $ 79,840,000 $ 10,664,000 $ 79,840,000 $ 10,664,000    
Number of investment securities in unrealized loss position | security     331   331     407
Number of investment securities in unrealized loss position longer than 12 months | security     323   323      
Number of investment securities in unrealized loss position less than 12 months | security     8   8      
Debt securities, available-for-sale unrealized loss position, allowance for credit loss     $ 0   $ 0     $ 0
Derivative, notional amount     11,300,000   11,300,000      
Subsequent event                
Debt Securities, Available-for-sale [Line Items]                
Proceeds from sale of available-for-sale securities $ 55,000,000              
Sale of available-for-sale securities, pretax net loss 2,100,000              
Sale of available-for-sale securities, loss net of tax $ 1,500,000              
Interest rate swap                
Debt Securities, Available-for-sale [Line Items]                
Derivative, notional amount             $ 101,800,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax                
Debt Securities, Available-for-sale [Line Items]                
Net unrealized pre-tax loss     $ 14,800,000   $ 14,800,000