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Investment Securities - Number of Temporarily Impaired Investment Securities (Details) - security
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 109 114
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 4 4
U.S. Government sponsored entities & agencies collateralized by mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 49 51
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 45 46
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 8 9
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, temporarily impaired, number of positions 3 4