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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
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

X

- 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).

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