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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale securities |  |
Total Investment Securities | $ 1,360,946 | $ 1,149,727
Gross Unrealized Gains | 39,820 | 6,721
Gross Unrealized Losses | 807 | 14,253
Investment securities available for sale | 1,399,959 | 1,142,195
Held to maturity securities |  |
Total Investment Securities | 692,965 | 490,387
Gross Unrealized Gains | 16,264 | 3,571
Gross Unrealized Losses | 314 | 4,741
Fair Value | 708,915 | 489,217
Amortized Cost | 2,053,911 | 1,640,114
Gross Unrealized Gains | 56,084 | 10,292
Gross Unrealized Losses | 1,121 | 18,994
Fair Value | 2,108,874 | 1,631,412
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Total Investment Securities | 33,494 | 13,493
Gross Unrealized Gains | 453 | 92
Gross Unrealized Losses | 0 | 3
Investment securities available for sale | 33,947 | 13,582
Held to maturity securities |  |
Total Investment Securities | 33,865 | 22,618
Gross Unrealized Gains | 20 | 0
Gross Unrealized Losses | 66 | 545
Fair Value | 33,819 | 22,073
State and municipal |  |
Available for sale securities |  |
Total Investment Securities | 685,123 | 605,994
Gross Unrealized Gains | 30,835 | 5,995
Gross Unrealized Losses | 200 | 5,854
Investment securities available for sale | 715,758 | 606,135
Held to maturity securities |  |
Total Investment Securities | 310,076 | 197,909
Gross Unrealized Gains | 10,987 | 2,858
Gross Unrealized Losses | 22 | 872
Fair Value | 321,041 | 199,895
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Total Investment Securities | 642,298 | 530,209
Gross Unrealized Gains | 8,532 | 634
Gross Unrealized Losses | 607 | 8,396
Investment securities available for sale | 650,223 | 522,447
Held to maturity securities |  |
Total Investment Securities | 347,524 | 268,860
Gross Unrealized Gains | 5,257 | 713
Gross Unrealized Losses | 226 | 3,323
Fair Value | 352,555 | 266,250
Corporate obligations |  |
Available for sale securities |  |
Total Investment Securities | 31 | 31
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Investment securities available for sale | 31 | 31
Foreign investment |  |
Held to maturity securities |  |
Total Investment Securities | 1,500 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Fair Value | $ 1,500 | $ 999

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