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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale securities |  |
Total Investment Securities | $ 1,229,729 | $ 1,149,727
Gross Unrealized Gains | 21,575 | 6,721
Gross Unrealized Losses | 3,672 | 14,253
Investment securities available for sale | 1,247,632 | 1,142,195
Held to maturity securities |  |
Total Investment Securities | 615,027 | 490,387
Gross Unrealized Gains | 9,312 | 3,571
Gross Unrealized Losses | 1,704 | 4,741
Fair Value | 622,635 | 489,217
Amortized Cost | 1,844,756 | 1,640,114
Gross Unrealized Gains | 30,887 | 10,292
Gross Unrealized Losses | 5,376 | 18,994
Fair Value | 1,870,267 | 1,631,412
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Total Investment Securities | 33,494 | 13,493
Gross Unrealized Gains | 210 | 92
Gross Unrealized Losses | 1 | 3
Investment securities available for sale | 33,703 | 13,582
Held to maturity securities |  |
Total Investment Securities | 22,619 | 22,618
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 350 | 545
Fair Value | 22,269 | 22,073
State and municipal |  |
Available for sale securities |  |
Total Investment Securities | 633,617 | 605,994
Gross Unrealized Gains | 18,773 | 5,995
Gross Unrealized Losses | 532 | 5,854
Investment securities available for sale | 651,858 | 606,135
Held to maturity securities |  |
Total Investment Securities | 254,520 | 197,909
Gross Unrealized Gains | 6,682 | 2,858
Gross Unrealized Losses | 117 | 872
Fair Value | 261,085 | 199,895
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Total Investment Securities | 562,587 | 530,209
Gross Unrealized Gains | 2,592 | 634
Gross Unrealized Losses | 3,139 | 8,396
Investment securities available for sale | 562,040 | 522,447
Held to maturity securities |  |
Total Investment Securities | 336,888 | 268,860
Gross Unrealized Gains | 2,630 | 713
Gross Unrealized Losses | 1,237 | 3,323
Fair Value | 338,281 | 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 | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Fair Value | $ 1,000 | $ 999

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