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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | $ 732,002 | $ 719,983
Gross Unrealized Gains | 2,491 | 5,036
Gross Unrealized Losses | 15,934 | 7,777
Fair Value | 718,559 | 717,242
Obligations of US Government sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 6,982 | 6,967
Gross Unrealized Gains | 1 | 5
Gross Unrealized Losses | 6 | 0
Fair Value | 6,977 | 6,972
US Government-sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 459,601 | 447,081
Gross Unrealized Gains | 838 | 1,738
Gross Unrealized Losses | 11,264 | 5,816
Fair Value | 449,175 | 443,003
US Government agency |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 92,286 | 96,357
Gross Unrealized Gains | 275 | 413
Gross Unrealized Losses | 2,165 | 1,174
Fair Value | 90,396 | 95,596
Private label |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 484 | 529
Gross Unrealized Gains | 137 | 150
Gross Unrealized Losses | 5 | 5
Fair Value | 616 | 674
Obligations of states and political subdivisions thereof |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 136,244 | 138,522
Gross Unrealized Gains | 1,079 | 2,407
Gross Unrealized Losses | 2,046 | 729
Fair Value | 135,277 | 140,200
Corporate bonds |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 36,405 | 30,527
Gross Unrealized Gains | 161 | 323
Gross Unrealized Losses | 448 | 53
Fair Value | $ 36,118 | $ 30,797

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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