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Investment Securities - Schedule of Bond Ratings For Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity $ 935,142 $ 972,207
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 62,151 62,500
Corporate bonds    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 30,000 30,000
Moody's And/Or Standard & Poor's AAA Rating | Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 42,680 42,986
Moody's And/Or Standard & Poor's AAA Rating | Corporate bonds    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 0 0
Moody's And/Or Standard & Poor's AA Rating | Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 19,471 19,514
Moody's And/Or Standard & Poor's AA Rating | Corporate bonds    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 0 0
Moody's And/Or Standard & Poor's A Rating | Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 0 0
Moody's And/Or Standard & Poor's A Rating | Corporate bonds    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity $ 30,000 $ 30,000