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Investment Securities - Schedule of contractual maturity of debt securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,187,499 | $ 1,028,883
Debt Securities, Available-for-sale | 1,209,701 | 1,003,421
Obligations of States and Political Subdivisions |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 3,984 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 4,135 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 3.04% |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | $ 298,944 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 316,356 |
Debt Securities, Available-for-sale, Maturity, after 10 Years, Weighted Average Yield | 3.69% |
Debt Securities, Available-for-sale, Amortized Cost | $ 302,928 |
Debt Securities, Available-for-sale | $ 320,491 |
Available for Sale Securities Weighted Avg Yield | 3.68% |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 884,571 | 1,028,883
Debt Securities, Available-for-sale | $ 889,210 | $ 1,003,421
Available for Sale Securities Weighted Avg Yield | 2.37% |

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