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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale securities |  |
Total Investment Securities | $ 1,732,279,000 | $ 1,740,420,000
Gross Unrealized Gains | 83,903,000 | 51,816,000
Gross Unrealized Losses | 407,000 | 2,211,000
Fair Value | 1,815,775,000 | 1,790,025,000
Held to maturity securities |  |
Total Investment Securities | 882,179,000 | 806,038,000
Gross Unrealized Gains | 38,027,000 | 22,073,000
Gross Unrealized Losses | 28,000 | 545,000
Fair Value | 920,178,000 | 827,566,000
Amortized Cost | 2,614,458,000 | 2,546,458,000
Gross Unrealized Gains | 121,930,000 | 73,889,000
Gross Unrealized Losses | 435,000 | 2,756,000
Fair Value | 2,735,953,000 | 2,617,591,000
U.S. Treasury |  |
Available for sale securities |  |
Total Investment Securities | 596,000 |
Gross Unrealized Gains | 4,000 |
Gross Unrealized Losses | 0 |
Fair Value | 600,000 |
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Total Investment Securities | 12,398,000 | 38,529,000
Gross Unrealized Gains | 80,000 | 346,000
Gross Unrealized Losses | 0 | 0
Fair Value | 12,478,000 | 38,875,000
Held to maturity securities |  |
Total Investment Securities | 35,050,000 | 15,619,000
Gross Unrealized Gains | 8,000 | 1,000
Gross Unrealized Losses | 0 | 37,000
Fair Value | 35,058,000 | 15,583,000
State and municipal |  |
Available for sale securities |  |
Total Investment Securities | 898,991,000 | 859,511,000
Gross Unrealized Gains | 50,523,000 | 41,092,000
Gross Unrealized Losses | 306,000 | 807,000
Fair Value | 949,208,000 | 899,796,000
Held to maturity securities |  |
Total Investment Securities | 358,479,000 | 354,115,000
Gross Unrealized Gains | 18,030,000 | 15,151,000
Gross Unrealized Losses | 28,000 | 107,000
Fair Value | 376,481,000 | 369,159,000
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Total Investment Securities | 820,263,000 | 842,349,000
Gross Unrealized Gains | 33,296,000 | 10,378,000
Gross Unrealized Losses | 101,000 | 1,404,000
Fair Value | 853,458,000 | 851,323,000
Held to maturity securities |  |
Total Investment Securities | 487,150,000 | 434,804,000
Gross Unrealized Gains | 19,989,000 | 6,921,000
Gross Unrealized Losses | 0 | 401,000
Fair Value | 507,139,000 | 441,324,000
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 |  |
Held to maturity securities |  |
Total Investment Securities | 1,500,000 | 1,500,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 1,500,000 | $ 1,500,000

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