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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	$ 737,141	$ 719,983
Gross Unrealized Gains	2,871	5,036
Gross Unrealized Losses	14,175	7,777
Fair Value	725,837	717,242
Obligations of US Government sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost		6,967
Gross Unrealized Gains		5
Gross Unrealized Losses		0
Fair Value		6,972
US Government-sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	413,492	447,081
Gross Unrealized Gains	904	1,738
Gross Unrealized Losses	9,444	5,816
Fair Value	404,952	443,003
US Government agency
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	111,938	96,357
Gross Unrealized Gains	509	413
Gross Unrealized Losses	1,935	1,174
Fair Value	110,512	95,596
Private label
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	20,353	529
Gross Unrealized Gains	113	150
Gross Unrealized Losses	84	5
Fair Value	20,382	674
Obligations of states and political subdivisions thereof
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	133,260	138,522
Gross Unrealized Gains	1,081	2,407
Gross Unrealized Losses	2,076	729
Fair Value	132,265	140,200
Corporate bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	58,098	30,527
Gross Unrealized Gains	264	323
Gross Unrealized Losses	636	53
Fair Value	$ 57,726	$ 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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