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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	$ 716,610	$ 532,125
Gross Unrealized Gains	7,556	5,627
Gross Unrealized Losses	5,707	8,896
Available for sale securities	718,459	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	6,952	0
Gross Unrealized Gains	27	0
Gross Unrealized Losses	0	0
Available for sale securities	6,979	0
US Government-sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	438,332	330,635
Gross Unrealized Gains	3,413	2,682
Gross Unrealized Losses	3,788	4,865
Available for sale securities	437,957	328,452
US Government agency
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	102,044	76,722
Gross Unrealized Gains	695	797
Gross Unrealized Losses	601	613
Available for sale securities	102,138	76,906
Private label
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	562	936
Gross Unrealized Gains	162	207
Gross Unrealized Losses	5	11
Available for sale securities	719	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	140,475	123,832
Gross Unrealized Gains	2,818	1,941
Gross Unrealized Losses	1,311	3,407
Available for sale securities	141,982	122,366
Corporate bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Available-for-sale securities, amortized cost basis	28,245	0
Gross Unrealized Gains	441	0
Gross Unrealized Losses	2	0
Available for sale securities	$ 28,684	$ 0

X

- Definition

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

+ References

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-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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