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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 140,599  
Available-for-sale investments, After 1 through 5 years 417,465  
Available-for-sale investments, After 5 through 10 years 149,029  
Available-for-sale investments, After ten years 1,065  
Available-for-sale investments, Fair Value $ 708,158 $ 685,636
Available-for-sale, Weighted average yield, One year or less (in hundredths) 2.34%  
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) 2.59%  
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) 2.41%  
Available-for-sale , Weighted average yield,After ten years (in hundredths) 3.68%  
Available-for-sale , Weighted average yield,Total (in hundredths) 2.50%  
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) 2.60%  
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) 2.78%  
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) 3.05%  
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) 4.99%  
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) 2.79%  
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity $ 15,009 69,542
Held To Maturity Weighted average yield, One year or less 2.33%  
Held To Maturity Weighted average yield, After 1 through 5 years 2.06%  
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 2.24%  
Held To Maturity, Full tax-equivalent yield , One year or less 2.33%  
Held To Maturity, Full tax-equivalent yield , After 1 through 5 years 2.06%  
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 2.24%  
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 46,263  
Available-for-sale investments, After 1 through 5 years 15,852  
Available-for-sale investments, After 5 through 10 years 11,784  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 73,899 107,320
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less 9,985  
Held-to-maturity, After1 through 5 years 5,024  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 0  
Held-to-maturity 15,009 69,542
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 32,878  
Available-for-sale investments, After 1 through 5 years 73,456  
Available-for-sale investments, After 5 through 10 years 93,298  
Available-for-sale investments, After ten years 1,065  
Available-for-sale investments, Fair Value 200,697 178,433
Mortgage-backed Securities: GSE Residential    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 61,458  
Available-for-sale investments, After 1 through 5 years 321,315  
Available-for-sale investments, After 5 through 10 years 42,901  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 425,674 396,126
Other Securities    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 0  
Available-for-sale investments, After 1 through 5 years 6,842  
Available-for-sale investments, After 5 through 10 years 1,046  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value $ 7,888 $ 3,757