SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 914,772	$ 798,575
Gross Unrealized Gains, Available for Sale	13,537	3,027
Gross Unrealized Losses, Available for Sale	(4,749)	(10,836)
Fair Value, Available for Sale	923,560	790,766
Gross Amortized Cost, Held for Investment Securities	401,570	203,525
Gross Unrealized Gains, Held for Investment Securities	6,811	1,155
Gross Unrealized Losses, Held for Investment Securities	(3,629)	(1,867)
Fair Value, Held for Investment Securities	404,572	202,813
U.S. Treasury Securities and obligations of U.S. Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	13,207	3,833
Gross Unrealized Gains, Available for Sale	353	78
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	13,560	3,911
Mortgage-backed securities of U.S. Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	202,580	192,224
Gross Unrealized Gains, Available for Sale	4,283	847
Gross Unrealized Losses, Available for Sale	(99)	(1,322)
Fair Value, Available for Sale	206,764	191,749
Gross Amortized Cost, Held for Investment Securities	182,956	64,993
Gross Unrealized Gains, Held for Investment Securities	4,068	574
Gross Unrealized Losses, Held for Investment Securities	0	(16)
Fair Value, Held for Investment Securities	187,024	65,551
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	282,426	242,620
Gross Unrealized Gains, Available for Sale	3,312	470
Gross Unrealized Losses, Available for Sale	(744)	(4,900)
Fair Value, Available for Sale	284,994	238,190
Gross Amortized Cost, Held for Investment Securities	170,102	89,265
Gross Unrealized Gains, Held for Investment Securities	2,743	581
Gross Unrealized Losses, Held for Investment Securities	(87)	(406)
Fair Value, Held for Investment Securities	172,758	89,440
Private mortgage backed securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	32,668	32,558
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(782)	(766)
Fair Value, Available for Sale	31,886	31,792
Fair Value, Held for Investment Securities	0
Private collateralized mortgage obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	78,202	77,965
Gross Unrealized Gains, Available for Sale	605	700
Gross Unrealized Losses, Available for Sale	(1,059)	(708)
Fair Value, Available for Sale	77,748	77,957
Gross Amortized Cost, Held for Investment Securities	7,068	7,967
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(141)	(85)
Fair Value, Held for Investment Securities	6,927	7,882
Collateralized loan obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	124,617	124,477
Gross Unrealized Gains, Available for Sale	18	0
Gross Unrealized Losses, Available for Sale	(1,616)	(1,894)
Fair Value, Available for Sale	123,019	122,583
Gross Amortized Cost, Held for Investment Securities	41,444	41,300
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(3,401)	(1,360)
Fair Value, Held for Investment Securities	38,043	39,940
Obligations of state and political subdivisions [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	60,936	39,119
Gross Unrealized Gains, Available for Sale	3,499	882
Gross Unrealized Losses, Available for Sale	0	(110)
Fair Value, Available for Sale	64,435	39,891
Corporate and other debt securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	76,845	44,652
Gross Unrealized Gains, Available for Sale	948	37
Gross Unrealized Losses, Available for Sale	(94)	(416)
Fair Value, Available for Sale	77,699	44,273
Fair Value, Held for Investment Securities	0
Private commercial mortgage backed securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	43,291	41,127
Gross Unrealized Gains, Available for Sale	519	13
Gross Unrealized Losses, Available for Sale	(355)	(720)
Fair Value, Available for Sale	43,455	$ 40,420
Fair Value, Held for Investment Securities	$ 0

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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Amount of debt securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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- Definition

Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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