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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 207,114  
Available-for-sale investments, After 1 through 5 years 280,756  
Available-for-sale investments, After 5 through 10 years 740,238  
Available-for-sale investments, After ten years 2,680  
Available-for-sale investments, Fair Value $ 1,230,788 $ 1,421,422
Available-for-sale, Weighted average yield, One year or less (in hundredths) 1.56%  
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) 3.17%  
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) 1.76%  
Available-for-sale , Weighted average yield,After ten years (in hundredths) 2.88%  
Available-for-sale , Weighted average yield,Total (in hundredths) 2.03%  
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) 1.68%  
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) 3.44%  
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) 1.93%  
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) 3.40%  
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) 2.21%  
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 2,930  
Held-to-maturity $ 2,930 7,030
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 $ 159,663  
Available-for-sale investments, After 1 through 5 years 53,511  
Available-for-sale investments, After 5 through 10 years 9,557  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 222,731 203,815
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity   5,001
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 24,140  
Available-for-sale investments, After 1 through 5 years 75,195  
Available-for-sale investments, After 5 through 10 years 185,717  
Available-for-sale investments, After ten years 1,056  
Available-for-sale investments, Fair Value 286,108 395,457
Mortgage-backed Securities: GSE Residential    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 3,831  
Available-for-sale investments, After 1 through 5 years 90,744  
Available-for-sale investments, After 5 through 10 years 544,195  
Available-for-sale investments, After ten years 1,624  
Available-for-sale investments, Fair Value 640,394 791,038
Other Securities    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 19,480  
Available-for-sale investments, After 1 through 5 years 61,306  
Available-for-sale investments, After 5 through 10 years 769  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 81,555 31,112
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 2,930  
Held-to-maturity $ 2,930 $ 2,029