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Investment Securities - Amortized Cost and Approximate Fair Values of Securities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Total available for sale |  |
Total Investment Securities | $ 1,149,727,000 | $ 986,565,000
Gross Unrealized Gains | 6,721,000 | 17,896,000
Gross Unrealized Losses | 14,253,000 | 4,514,000
Investment securities available for sale | 1,142,195,000 | 999,947,000
Total held to maturity |  |
Amortized Cost | 490,387,000 | 560,655,000
Gross Unrealized Gains | 3,571,000 | 9,636,000
Gross Unrealized Losses | 4,741,000 | 2,083,000
Fair Value | 489,217,000 | 568,208,000
Total Investment Securities |  |
Amortized Cost | 1,640,114,000 | 1,547,220,000
Gross Unrealized Gains | 10,292,000 | 27,532,000
Gross Unrealized Losses | 18,994,000 | 6,597,000
Fair Value | 1,631,412,000 | 1,568,155,000
U.S. Government-sponsored agency securities |  |
Total available for sale |  |
Total Investment Securities | 13,493,000 |
Gross Unrealized Gains | 92,000 |
Gross Unrealized Losses | 3,000 |
Investment securities available for sale | 13,582,000 |
Total held to maturity |  |
Amortized Cost | 22,618,000 | 22,618,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | 545,000 | 435,000
Fair Value | 22,073,000 | 22,183,000
State and municipal |  |
Total available for sale |  |
Total Investment Securities | 605,994,000 | 510,852,000
Gross Unrealized Gains | 5,995,000 | 16,932,000
Gross Unrealized Losses | 5,854,000 | 1,091,000
Investment securities available for sale | 606,135,000 | 526,693,000
Total held to maturity |  |
Amortized Cost | 197,909,000 | 235,594,000
Gross Unrealized Gains | 2,858,000 | 6,295,000
Gross Unrealized Losses | 872,000 | 244,000
Fair Value | 199,895,000 | 241,645,000
U.S. Government-sponsored mortgage-backed securities |  |
Total available for sale |  |
Total Investment Securities | 530,209,000 | 473,325,000
Gross Unrealized Gains | 634,000 | 964,000
Gross Unrealized Losses | 8,396,000 | 3,423,000
Investment securities available for sale | 522,447,000 | 470,866,000
Total held to maturity |  |
Amortized Cost | 268,860,000 | 301,443,000
Gross Unrealized Gains | 713,000 | 3,341,000
Gross Unrealized Losses | 3,323,000 | 1,404,000
Fair Value | 266,250,000 | 303,380,000
Corporate obligations |  |
Total available for sale |  |
Total Investment Securities | 31,000 | 31,000
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Investment securities available for sale | 31,000 | 31,000
Foreign Investment |  |
Total available for sale |  |
Gross Unrealized Losses | 0 |
Total held to maturity |  |
Amortized Cost | 1,000,000 | 1,000,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | 1,000 |
Fair Value | $ 999,000 | 1,000,000
Equity securities |  |
Total available for sale |  |
Total Investment Securities |  | 2,357,000
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Investment securities available for sale |  | $ 2,357,000

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