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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 175,367  
Available-for-sale investments, After 1 through 5 years 476,511  
Available-for-sale investments, After 5 through 10 years 689,936  
Available-for-sale investments, After ten years 79,608  
Available-for-sale investments, Fair Value $ 1,421,422 $ 879,240
Available-for-sale, Weighted average yield, One year or less (in hundredths) 1.55%  
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) 2.04%  
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) 1.67%  
Available-for-sale , Weighted average yield,After ten years (in hundredths) 2.11%  
Available-for-sale , Weighted average yield,Total (in hundredths) 1.80%  
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) 1.72%  
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) 2.22%  
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) 1.87%  
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) 2.64%  
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) 2.01%  
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less $ 5,001  
Held-to-maturity, After1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 2,029  
Held-to-maturity $ 7,030 5,016
Held To Maturity Weighted average yield, One year or less 2.06%  
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 2.06%  
Held To Maturity, Full tax-equivalent yield , One year or less 2.06%  
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 2.06%  
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 $ 132,009  
Available-for-sale investments, After 1 through 5 years 60,744  
Available-for-sale investments, After 5 through 10 years 11,062  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 203,815 127,069
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less 5,001  
Held-to-maturity, After1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 0  
Held-to-maturity 5,001 5,016
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 26,159  
Available-for-sale investments, After 1 through 5 years 87,639  
Available-for-sale investments, After 5 through 10 years 205,518  
Available-for-sale investments, After ten years 76,141  
Available-for-sale investments, Fair Value 395,457 249,844
Mortgage-backed Securities: GSE Residential    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 13,677  
Available-for-sale investments, After 1 through 5 years 309,961  
Available-for-sale investments, After 5 through 10 years 467,400  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 791,038 491,348
Other Securities    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 3,522  
Available-for-sale investments, After 1 through 5 years 18,167  
Available-for-sale investments, After 5 through 10 years 5,956  
Available-for-sale investments, After ten years 3,467  
Available-for-sale investments, Fair Value 31,112 $ 10,979
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 2,029  
Held-to-maturity $ 2,029