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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | $ 2,761,022 | $ 2,397,886
Gross Unrealized Gains | 64,048 | 77,293
Gross Unrealized Losses | 7,209 | 2,254
Fair Value | 2,817,861 | 2,472,925
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 2,760,772 |
Fair Value | 2,817,436 |
Other Securities [Abstract] |  |
Amortized Cost | 50,189 | 40,049
Fair Value | 50,189 | 40,049
U.S. Treasury and Agency Obligations [Member] |  |
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 1,861,584 | 1,479,134
Gross Unrealized Gains | 34,939 | 39,509
Gross Unrealized Losses | 3,078 | 910
Fair Value | 1,893,445 | 1,517,733
Obligations of State and Political Subdivisions [Member] |  |
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 645,271 | 645,398
Gross Unrealized Gains | 20,092 | 26,749
Gross Unrealized Losses | 2,599 | 244
Fair Value | 662,764 | 671,903
Government Agency Mortgage-Backed Securities [Member] |  |
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 212,145 | 228,971
Gross Unrealized Gains | 8,080 | 9,782
Gross Unrealized Losses | 1,470 | 1,025
Fair Value | 218,755 | 237,728
Corporate Debt Securities [Member] |  |
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 26,738 | 26,803
Gross Unrealized Gains | 141 | 363
Gross Unrealized Losses | 62 | 75
Fair Value | 26,817 | 27,091
Government Agency Collateralized Mortgage Obligations [Member] |  |
Available For Sale Debt Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 15,034 | 17,330
Gross Unrealized Gains | 621 | 695
Gross Unrealized Losses | 0 | 0
Fair Value | 15,655 | 18,025
Marketable Equity Securities [Member] |  |
Available For Sale Equity Securities Amortized Cost Basis [Abstract] |  |
Amortized Cost | 250 | 250
Gross Unrealized Gains | 175 | 195
Gross Unrealized Losses | 0 | 0
Fair Value | 425 | 445
Federal Home Loan Bank Common Stock [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 29,864 | 19,553
Fair Value | 29,864 | 19,553
Federal Reserve Bank Common Stock [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 16,050 | 16,050
Fair Value | 16,050 | 16,050
Other Equity Securities [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 4,275 | 4,446
Fair Value | $ 4,275 | $ 4,446

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