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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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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).

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