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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Available for sale securities |  |
Total Investment Securities | $ 1,593,317,000 | $ 1,149,727,000
Gross Unrealized Gains | 54,773,000 | 6,721,000
Gross Unrealized Losses | 1,691,000 | 14,253,000
Fair Value | 1,646,399,000 | 1,142,195,000
Held to maturity securities |  |
Total Investment Securities | 843,021,000 | 490,387,000
Gross Unrealized Gains | 22,869,000 | 3,571,000
Gross Unrealized Losses | 604,000 | 4,741,000
Fair Value | 865,286,000 | 489,217,000
Amortized Cost | 2,436,338,000 | 1,640,114,000
Gross Unrealized Gains | 77,642,000 | 10,292,000
Gross Unrealized Losses | 2,295,000 | 18,994,000
Fair Value | 2,511,685,000 | 1,631,412,000
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Total Investment Securities | 48,553,000 | 13,493,000
Gross Unrealized Gains | 450,000 | 92,000
Gross Unrealized Losses | 26,000 | 3,000
Fair Value | 48,977,000 | 13,582,000
Held to maturity securities |  |
Total Investment Securities | 42,434,000 | 22,618,000
Gross Unrealized Gains | 4,000 | 0
Gross Unrealized Losses | 95,000 | 545,000
Fair Value | 42,343,000 | 22,073,000
State and municipal |  |
Available for sale securities |  |
Total Investment Securities | 754,846,000 | 605,994,000
Gross Unrealized Gains | 42,663,000 | 5,995,000
Gross Unrealized Losses | 634,000 | 5,854,000
Fair Value | 796,875,000 | 606,135,000
Held to maturity securities |  |
Total Investment Securities | 355,263,000 | 197,909,000
Gross Unrealized Gains | 15,841,000 | 2,858,000
Gross Unrealized Losses | 40,000 | 872,000
Fair Value | 371,064,000 | 199,895,000
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Total Investment Securities | 789,887,000 | 530,209,000
Gross Unrealized Gains | 11,660,000 | 634,000
Gross Unrealized Losses | 1,031,000 | 8,396,000
Fair Value | 800,516,000 | 522,447,000
Held to maturity securities |  |
Total Investment Securities | 443,824,000 | 268,860,000
Gross Unrealized Gains | 7,024,000 | 713,000
Gross Unrealized Losses | 462,000 | 3,323,000
Fair Value | 450,386,000 | 266,250,000
Corporate obligations |  |
Available for sale securities |  |
Total Investment Securities | 31,000 | 31,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 31,000 | 31,000
Foreign investment |  |
Available for sale securities |  |
Gross Unrealized Losses | 0 |
Held to maturity securities |  |
Total Investment Securities | 1,500,000 | 1,000,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 7,000 | 1,000
Fair Value | $ 1,493,000 | $ 999,000

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