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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2015 USD ($) Position | Dec. 31, 2014 USD ($) Position
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Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 214 | 28
12 months or longer | Position | 26 | 71
Total | Position | 240 | 99
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 611,156 | $ 16,458
12 months or longer | 36,259 | 166,383
Total | 647,415 | 182,841
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 5,738 | 35
12 months or longer | 1,471 | 2,219
Total | $ 7,209 | $ 2,254
U.S. Treasury and Agency Obligations [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 14 | 0
12 months or longer | Position | 0 | 4
Total | Position | 14 | 4
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 493,707 | $ 0
12 months or longer | 0 | 102,363
Total | 493,707 | 102,363
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 3,078 | 0
12 months or longer | 0 | 910
Total | $ 3,078 | $ 910
Obligations of State and Political Subdivisions [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 193 | 23
12 months or longer | Position | 3 | 46
Total | Position | 196 | 69
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 104,687 | $ 13,413
12 months or longer | 1,171 | 26,490
Total | 105,858 | 39,903
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2,523 | 34
12 months or longer | 76 | 210
Total | $ 2,599 | $ 244
Government Agency Mortgage-Backed Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 7 | 3
12 months or longer | Position | 20 | 19
Total | Position | 27 | 22
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 12,762 | $ 5
12 months or longer | 32,348 | 34,770
Total | 45,110 | 34,775
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 137 | 0
12 months or longer | 1,333 | 1,025
Total | $ 1,470 | $ 1,025
Corporate Debt Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 1
12 months or longer | Position | 1 | 1
Total | Position | 1 | 2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 3,040
12 months or longer | 2,736 | 2,755
Total | 2,736 | 5,795
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 1
12 months or longer | 62 | 74
Total | $ 62 | $ 75
Government Agency Collateralized Mortgage Obligations [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 1
12 months or longer | Position | 2 | 1
Total | Position | 2 | 2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 0
12 months or longer | 4 | 5
Total | 4 | 5
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 0
12 months or longer | 0 | 0
Total | $ 0 | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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