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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | $ 749,639 | $ 737,141
Gross Unrealized Gains | 5,581 | 2,871
Gross Unrealized Losses | 7,985 | 14,175
Fair Value | 747,235 | 725,837
US Government-sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 404,713 | 413,492
Gross Unrealized Gains | 1,975 | 904
Gross Unrealized Losses | 5,410 | 9,444
Fair Value | 401,278 | 404,952
US Government agency |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 123,984 | 111,938
Gross Unrealized Gains | 981 | 509
Gross Unrealized Losses | 1,219 | 1,935
Fair Value | 123,746 | 110,512
Private label |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 20,342 | 20,353
Gross Unrealized Gains | 78 | 113
Gross Unrealized Losses | 150 | 84
Fair Value | 20,270 | 20,382
Obligations of states and political subdivisions thereof |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 128,666 | 133,260
Gross Unrealized Gains | 2,106 | 1,081
Gross Unrealized Losses | 824 | 2,076
Fair Value | 129,948 | 132,265
Corporate bonds |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Amortized Cost | 71,934 | 58,098
Gross Unrealized Gains | 441 | 264
Gross Unrealized Losses | 382 | 636
Fair Value | $ 71,993 | $ 57,726

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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