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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | $ 735,038 | $ 719,983
Gross Unrealized Gains | 1,319 | 5,036
Gross Unrealized Losses | 23,699 | 7,777
Fair Value | 712,658 | 717,242
Obligations of US Government-sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 3,998 | 6,967
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 1 | 0
Fair Value | 3,997 | 6,972
US Government-sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 441,725 | 447,081
Gross Unrealized Gains | 357 | 1,738
Gross Unrealized Losses | 16,791 | 5,816
Fair Value | 425,291 | 443,003
US Government agency |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 116,638 | 96,357
Gross Unrealized Gains | 136 | 413
Gross Unrealized Losses | 3,192 | 1,174
Fair Value | 113,582 | 95,596
Private label |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 428 | 529
Gross Unrealized Gains | 112 | 150
Gross Unrealized Losses | 5 | 5
Fair Value | 535 | 674
Obligations of states and political subdivisions thereof |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 133,926 | 138,522
Gross Unrealized Gains | 600 | 2,407
Gross Unrealized Losses | 3,089 | 729
Fair Value | 131,437 | 140,200
Corporate bonds |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 38,323 | 30,527
Gross Unrealized Gains | 114 | 323
Gross Unrealized Losses | 621 | 53
Fair Value | $ 37,816 | $ 30,797

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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