SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 730,722	$ 746,390
Gross Unrealized Gains, Available for Sale	5,701	4,388
Gross Unrealized Losses, Available for Sale	(6,191)	(9,403)
Fair Value, Available for Sale	730,232	741,375
Gross Amortized Cost, Held for Investment Securities	223,061	207,904
Gross Unrealized Gains, Held for Investment Securities	3,769	1,507
Gross Unrealized Losses, Held for Investment Securities	(324)	(623)
Held for investment fair value	226,506	208,788
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	3,773	3,876
Gross Unrealized Gains, Available for Sale	90	23
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	3,863	3,899
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	117,961	123,981
Gross Unrealized Gains, Available for Sale	1,790	1,501
Gross Unrealized Losses, Available for Sale	(260)	(423)
Fair Value, Available for Sale	119,491	125,059
Gross Amortized Cost, Held for Investment Securities	66,291	67,535
Gross Unrealized Gains, Held for Investment Securities	1,876	812
Gross Unrealized Losses, Held for Investment Securities	0	0
Held for investment fair value	68,167	68,347
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	334,248	352,483
Gross Unrealized Gains, Available for Sale	2,086	1,075
Gross Unrealized Losses, Available for Sale	(3,647)	(6,077)
Fair Value, Available for Sale	332,687	347,481
Gross Amortized Cost, Held for Investment Securities	106,763	114,541
Gross Unrealized Gains, Held for Investment Securities	1,768	695
Gross Unrealized Losses, Held for Investment Securities	0	(280)
Held for investment fair value	108,531	114,956
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	30,011	29,967
Gross Unrealized Gains, Available for Sale	50	291
Gross Unrealized Losses, Available for Sale	(221)	0
Fair Value, Available for Sale	29,840	30,258
Gross Amortized Cost, Held for Investment Securities	0
Held for investment fair value	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	94,072	85,175
Gross Unrealized Gains, Available for Sale	822	688
Gross Unrealized Losses, Available for Sale	(1,007)	(728)
Fair Value, Available for Sale	93,887	85,135
Gross Amortized Cost, Held for Investment Securities	8,708
Gross Unrealized Gains, Held for Investment Securities	0
Gross Unrealized Losses, Held for Investment Securities	(84)
Held for investment fair value	8,624
Collateralized loan obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	127,416	127,397
Gross Unrealized Gains, Available for Sale	13	0
Gross Unrealized Losses, Available for Sale	(1,053)	(2,172)
Fair Value, Available for Sale	126,376	125,225
Gross Amortized Cost, Held for Investment Securities	41,299	25,828
Gross Unrealized Gains, Held for Investment Securities	125	0
Gross Unrealized Losses, Held for Investment Securities	(240)	(343)
Held for investment fair value	41,184	25,485
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	23,241	23,511
Gross Unrealized Gains, Available for Sale	850	810
Gross Unrealized Losses, Available for Sale	(3)	(3)
Fair Value, Available for Sale	$ 24,088	$ 24,318

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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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.

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-Publisher FASB

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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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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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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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