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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | 6 Months Ended |
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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

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