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Investment Securities - Amortized Cost and Approximate Fair Values of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total available for sale |  |
Amortized Cost | $ 1,740,420 | $ 1,149,727
Gross Unrealized Gains | 51,816 | 6,721
Gross Unrealized Losses | 2,211 | 14,253
Fair Value | 1,790,025 | 1,142,195
Total held to maturity |  |
Amortized Cost | 806,038 | 490,387
Gross Unrealized Gains | 22,073 | 3,571
Gross Unrealized Losses | 545 | 4,741
Fair Value | 827,566 | 489,217
Total Investment Securities |  |
Amortized Cost | 2,546,458 | 1,640,114
Gross Unrealized Gains | 73,889 | 10,292
Gross Unrealized Losses | 2,756 | 18,994
Fair Value | 2,617,591 | 1,631,412
U.S. Government-sponsored agency securities |  |
Total available for sale |  |
Amortized Cost | 38,529 | 13,493
Gross Unrealized Gains | 346 | 92
Gross Unrealized Losses | 0 | 3
Fair Value | 38,875 | 13,582
Total held to maturity |  |
Amortized Cost | 15,619 | 22,618
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 37 | 545
Fair Value | 15,583 | 22,073
State and municipal |  |
Total available for sale |  |
Amortized Cost | 859,511 | 605,994
Gross Unrealized Gains | 41,092 | 5,995
Gross Unrealized Losses | 807 | 5,854
Fair Value | 899,796 | 606,135
Total held to maturity |  |
Amortized Cost | 354,115 | 197,909
Gross Unrealized Gains | 15,151 | 2,858
Gross Unrealized Losses | 107 | 872
Fair Value | 369,159 | 199,895
U.S. Government-sponsored mortgage-backed securities |  |
Total available for sale |  |
Amortized Cost | 842,349 | 530,209
Gross Unrealized Gains | 10,378 | 634
Gross Unrealized Losses | 1,404 | 8,396
Fair Value | 851,323 | 522,447
Total held to maturity |  |
Amortized Cost | 434,804 | 268,860
Gross Unrealized Gains | 6,921 | 713
Gross Unrealized Losses | 401 | 3,323
Fair Value | 441,324 | 266,250
Corporate obligations |  |
Total available for sale |  |
Amortized Cost | 31 | 31
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 31 | 31
Foreign investment |  |
Total held to maturity |  |
Amortized Cost | 1,500 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Fair Value | $ 1,500 | $ 999

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