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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 211,276  
Available-for-sale investments, After 1 through 5 years 185,091  
Available-for-sale investments, After 5 through 10 years 207,610  
Available-for-sale investments, After ten years 560,356  
Available-for-sale investments, Fair Value $ 1,164,333 $ 1,218,985
Available-for-sale, Weighted average yield, One year or less (in hundredths) 1.64%  
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) 2.51%  
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) 2.04%  
Available-for-sale , Weighted average yield,After ten years (in hundredths) 1.70%  
Available-for-sale , Weighted average yield,Total (in hundredths) 1.87%  
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) 1.67%  
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) 2.51%  
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) 2.06%  
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) 1.72%  
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) 1.89%  
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less $ 0  
Held-to-maturity, After1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 2,971  
Held-to-maturity $ 2,971 2,954
Held To Maturity Weighted average yield, One year or less 0.00%  
Held To Maturity Weighted average yield, After 1 through 5 years 0.00%  
Held To Maturity Weighted average yield After 5 through 10 years 0.00%  
Held To Maturity Weighted average yield After ten years 0.00%  
Held To Maturity Weighted average yield ,Total 0.00%  
Held To Maturity, Full tax-equivalent yield , One year or less 0.00%  
Held To Maturity, Full tax-equivalent yield , After 1 through 5 years 0.00%  
Held To Maturity, Full tax-equivalent yield , After 5 through 10 years 0.00%  
Held To Maturity, Full tax-equivalent yield , After ten years 0.00%  
Held To Maturity, Full tax-equivalent yield , Total 0.00%  
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 167,082  
Available-for-sale investments, After 1 through 5 years 48,072  
Available-for-sale investments, After 5 through 10 years 0  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 215,154 220,527
Obligations of States and Political Subdivisions    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 18,358  
Available-for-sale investments, After 1 through 5 years 80,207  
Available-for-sale investments, After 5 through 10 years 182,228  
Available-for-sale investments, After ten years 1,223  
Available-for-sale investments, Fair Value 282,016 287,698
Mortgage-backed Securities: GSE Residential    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 2,429  
Available-for-sale investments, After 1 through 5 years 7,456  
Available-for-sale investments, After 5 through 10 years 24,730  
Available-for-sale investments, After ten years 559,133  
Available-for-sale investments, Fair Value 593,748 627,880
Other Securities    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 23,407  
Available-for-sale investments, After 1 through 5 years 49,356  
Available-for-sale investments, After 5 through 10 years 652  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 73,415 82,880
Other Investments    
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less 0  
Held-to-maturity, After1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 2,971  
Held-to-maturity $ 2,971 $ 2,954