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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	$ 717,014	$ 532,125
Gross Unrealized Gains	7,451	5,627
Gross Unrealized Losses	6,119	8,896
Available for sale securities	718,346	528,856
Obligations of US Government sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	6,937	0
Gross Unrealized Gains	36	0
Gross Unrealized Losses	0	0
Available for sale securities	6,973	0
US Government-sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	456,840	330,635
Gross Unrealized Gains	3,344	2,682
Gross Unrealized Losses	4,133	4,865
Available for sale securities	456,051	328,452
US Government agency
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	77,869	76,722
Gross Unrealized Gains	720	797
Gross Unrealized Losses	527	613
Available for sale securities	78,062	76,906
Private label
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	744	936
Gross Unrealized Gains	174	207
Gross Unrealized Losses	7	11
Available for sale securities	911	1,132
Obligations of states and political subdivisions thereof
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	144,850	123,832
Gross Unrealized Gains	2,869	1,941
Gross Unrealized Losses	1,434	3,407
Available for sale securities	146,285	122,366
Corporate bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	29,774	0
Gross Unrealized Gains	308	0
Gross Unrealized Losses	18	0
Available for sale securities	$ 30,064	$ 0

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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