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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized Cost | $ 665,233 | $ 737,141
Gross Unrealized Gains | 13,202 | 2,871
Gross Unrealized Losses | 2,760 | 14,175
Available for sale securities | 675,675 | 725,837
US Government-sponsored enterprises |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 344,547 | 413,492
Gross Unrealized Gains | 5,924 | 904
Gross Unrealized Losses | 1,328 | 9,444
Available for sale securities | 349,143 | 404,952
US Government agency |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 116,912 | 111,938
Gross Unrealized Gains | 2,130 | 509
Gross Unrealized Losses | 217 | 1,935
Available for sale securities | 118,825 | 110,512
Private label |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 20,268 | 20,353
Gross Unrealized Gains | 75 | 113
Gross Unrealized Losses | 389 | 84
Available for sale securities | 19,954 | 20,382
Obligations of states and political subdivisions thereof |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 107,854 | 133,260
Gross Unrealized Gains | 3,519 | 1,081
Gross Unrealized Losses | 147 | 2,076
Available for sale securities | 111,226 | 132,265
Corporate bonds |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 75,652 | 58,098
Gross Unrealized Gains | 1,554 | 264
Gross Unrealized Losses | 679 | 636
Available for sale securities | $ 76,527 | $ 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=118939692&loc=d3e27161-111563 + Details
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