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Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance $ 2,542 $ 1,768
Total realized and unrealized gains included in noninterest income 67 18
Net purchases, sales, calls, and maturities 110 75
Net transfers into Level 3 0 0
Balance 2,719 1,861
Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses)relating to assets and liabilities still held at June 30 67 18
Available-for-Sale Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance 0 21,050
Net purchases, sales, calls, and maturities 0 0
Net transfers into Level 3 0 0
Balance 0 0
Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses)relating to assets and liabilities still held at June 30 0 0
Total unrealized gains included in other comprehensive income 0 0
Transfer to held to maturity $ 0 $ (21,050)