SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 905,295	$ 798,575
Gross Unrealized Gains, Available for Sale	8,155	3,027
Gross Unrealized Losses, Available for Sale	(8,268)	(10,836)
Fair Value, Available for Sale	905,182	790,766
Gross Amortized Cost, Held for Investment Securities	198,231	203,525
Gross Unrealized Gains, Held for Investment Securities	4,592	1,155
Gross Unrealized Losses, Held for Investment Securities	(4,003)	(1,867)
Fair Value, Held for Investment Securities	198,820	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	13,693	3,833
Gross Unrealized Gains, Available for Sale	305	78
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	13,998	3,911
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	206,630	192,224
Gross Unrealized Gains, Available for Sale	2,855	847
Gross Unrealized Losses, Available for Sale	(349)	(1,322)
Fair Value, Available for Sale	209,136	191,749
Gross Amortized Cost, Held for Investment Securities	64,718	64,993
Gross Unrealized Gains, Held for Investment Securities	2,702	574
Gross Unrealized Losses, Held for Investment Securities	0	(16)
Fair Value, Held for Investment Securities	67,420	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	297,383	242,620
Gross Unrealized Gains, Available for Sale	1,982	470
Gross Unrealized Losses, Available for Sale	(1,531)	(4,900)
Fair Value, Available for Sale	297,834	238,190
Gross Amortized Cost, Held for Investment Securities	84,346	89,265
Gross Unrealized Gains, Held for Investment Securities	1,890	581
Gross Unrealized Losses, Held for Investment Securities	0	(406)
Fair Value, Held for Investment Securities	86,236	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	32,610	32,558
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(998)	(766)
Fair Value, Available for Sale	31,612	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	82,940	77,965
Gross Unrealized Gains, Available for Sale	560	700
Gross Unrealized Losses, Available for Sale	(1,242)	(708)
Fair Value, Available for Sale	82,258	77,957
Gross Amortized Cost, Held for Investment Securities	7,778	7,967
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(150)	(85)
Fair Value, Held for Investment Securities	7,628	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	124,561	124,477
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(3,393)	(1,894)
Fair Value, Available for Sale	121,168	122,583
Gross Amortized Cost, Held for Investment Securities	41,389	41,300
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(3,853)	(1,360)
Fair Value, Held for Investment Securities	37,536	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	57,659	39,119
Gross Unrealized Gains, Available for Sale	1,879	882
Gross Unrealized Losses, Available for Sale	(18)	(110)
Fair Value, Available for Sale	59,520	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	46,048	44,652
Gross Unrealized Gains, Available for Sale	328	37
Gross Unrealized Losses, Available for Sale	(204)	(416)
Fair Value, Available for Sale	46,172	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	43,771	41,127
Gross Unrealized Gains, Available for Sale	246	13
Gross Unrealized Losses, Available for Sale	(533)	(720)
Fair Value, Available for Sale	43,484	$ 40,420
Fair Value, Held for Investment Securities	$ 0

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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.

+ 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=27724398&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
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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
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-Paragraph 1
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Amount of debt securities categorized neither as held-to-maturity nor trading.

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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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