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Investment Securities - Schedule of Marketable 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
Gross Unrealized/Unrecognized Holding Gains | 28,425 | 453
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,223 | 25,915
Debt Securities, Available-for-sale | 1,209,701 | 1,003,421
Debt Securities, Held-to-maturity | 0 | 351,808
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 3,289
Gross Unrealized/Unrecognized Holding Losses |  | 3,675
Debt Securities, Held-to-maturity, Fair Value |  | 351,422
Obligations of States and Political Subdivisions |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 302,928 |
Gross Unrealized/Unrecognized Holding Gains | 17,563 |
Debt Securities, Available-for-sale | 320,491 |
Debt Securities, Held-to-maturity |  | 305,278
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 3,202
Gross Unrealized/Unrecognized Holding Losses |  | 2,672
Debt Securities, Held-to-maturity, Fair Value |  | 305,808
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
Gross Unrealized/Unrecognized Holding Gains | 10,862 | 453
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,223 | 25,915
Debt Securities, Available-for-sale | $ 889,210 | 1,003,421
Debt Securities, Held-to-maturity |  | 46,530
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 87
Gross Unrealized/Unrecognized Holding Losses |  | 1,003
Debt Securities, Held-to-maturity, Fair Value |  | $ 45,614

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