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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale securities |  |
Total Investment Securities | $ 1,726,185 | $ 1,740,420
Gross Unrealized Gains | 98,162 | 51,816
Gross Unrealized Losses | 187 | 2,211
Fair Value | 1,824,160 | 1,790,025
Held to maturity securities |  |
Total Investment Securities | 1,109,126 | 806,038
Gross Unrealized Gains | 44,670 | 22,073
Gross Unrealized Losses | 1,278 | 545
Fair Value | 1,152,518 | 827,566
Amortized Cost | 2,835,311 | 2,546,458
Gross Unrealized Gains | 142,832 | 73,889
Gross Unrealized Losses | 1,465 | 2,756
Fair Value | 2,976,678 | 2,617,591
U.S. Treasury |  |
Available for sale securities |  |
Total Investment Securities | 300 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 300 |
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Total Investment Securities | 2,384 | 38,529
Gross Unrealized Gains | 60 | 346
Gross Unrealized Losses | 0 | 0
Fair Value | 2,444 | 38,875
Held to maturity securities |  |
Total Investment Securities | 21,094 | 15,619
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | 33 | 37
Fair Value | 21,063 | 15,583
State and municipal |  |
Available for sale securities |  |
Total Investment Securities | 1,074,381 | 859,511
Gross Unrealized Gains | 72,752 | 41,092
Gross Unrealized Losses | 187 | 807
Fair Value | 1,146,946 | 899,796
Held to maturity securities |  |
Total Investment Securities | 573,538 | 354,115
Gross Unrealized Gains | 25,880 | 15,151
Gross Unrealized Losses | 1,240 | 107
Fair Value | 598,178 | 369,159
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Total Investment Securities | 645,089 | 842,349
Gross Unrealized Gains | 25,306 | 10,378
Gross Unrealized Losses | 0 | 1,404
Fair Value | 670,395 | 851,323
Held to maturity securities |  |
Total Investment Securities | 512,994 | 434,804
Gross Unrealized Gains | 18,788 | 6,921
Gross Unrealized Losses | 3 | 401
Fair Value | 531,779 | 441,324
Corporate obligations |  |
Available for sale securities |  |
Total Investment Securities | 4,031 | 31
Gross Unrealized Gains | 44 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 4,075 | 31
Foreign investment |  |
Held to maturity securities |  |
Total Investment Securities | 1,500 | 1,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2 | 0
Fair Value | $ 1,498 | $ 1,500

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