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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	$ 741,318	$ 737,141
Gross Unrealized Gains	10,990	2,871
Gross Unrealized Losses	3,748	14,175
Fair Value	748,560	725,837
US Government-sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	401,311	413,492
Gross Unrealized Gains	4,795	904
Gross Unrealized Losses	2,578	9,444
Fair Value	403,528	404,952
US Government agency
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	118,583	111,938
Gross Unrealized Gains	1,785	509
Gross Unrealized Losses	383	1,935
Fair Value	119,985	110,512
Private label
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	20,306	20,353
Gross Unrealized Gains	80	113
Gross Unrealized Losses	225	84
Fair Value	20,161	20,382
Obligations of states and political subdivisions thereof
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	124,254	133,260
Gross Unrealized Gains	3,130	1,081
Gross Unrealized Losses	306	2,076
Fair Value	127,078	132,265
Corporate bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	76,864	58,098
Gross Unrealized Gains	1,200	264
Gross Unrealized Losses	256	636
Fair Value	$ 77,808	$ 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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