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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2016 USD ($) Position | Dec. 31, 2015 USD ($) Position
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Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 13 | 46
12 months or longer | Position | 18 | 24
Total | Position | 31 | 70
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 12,103 | $ 389,937
12 months or longer | 23,312 | 33,551
Total | 35,415 | 423,488
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 41 | 2,236
12 months or longer | 221 | 1,183
Total | $ 262 | $ 3,419
U.S. Treasury and Agency Obligations [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position |  | 9
12 months or longer | Position |  | 0
Total | Position |  | 9
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months |  | $ 353,844
12 months or longer |  | 0
Total |  | 353,844
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months |  | 2,027
12 months or longer |  | 0
Total |  | $ 2,027
Obligations of State and Political Subdivisions [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 4 | 18
12 months or longer | Position | 0 | 2
Total | Position | 4 | 20
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 1,987 | $ 8,804
12 months or longer | 0 | 735
Total | 1,987 | 9,539
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 1 | 34
12 months or longer | 0 | 25
Total | $ 1 | $ 59
Government Agency Mortgage-Backed Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 9 | 17
12 months or longer | Position | 15 | 19
Total | Position | 24 | 36
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 10,116 | $ 24,178
12 months or longer | 23,228 | 30,103
Total | 33,344 | 54,281
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 40 | 161
12 months or longer | 202 | 1,100
Total | $ 242 | $ 1,261
Corporate Debt Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position |  | 1
12 months or longer | Position |  | 1
Total | Position |  | 2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months |  | $ 3,024
12 months or longer |  | 2,710
Total |  | 5,734
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months |  | 0
12 months or longer |  | 58
Total |  | $ 58
Government Agency Collateralized Mortgage Obligations [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 0
12 months or longer | Position | 2 | 2
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 | 2 | 3
Total | 2 | 3
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
Marketable Equity 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 | 0
Total | Position | 1 | 1
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 87
12 months or longer | 82 | 0
Total | 82 | 87
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 14
12 months or longer | 19 | 0
Total | $ 19 | $ 14

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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=73527792&loc=d3e27337-111563 Reference 2: 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=73527792&loc=d3e27290-111563 + Details
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