SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 729,465	$ 746,390
Gross Unrealized Gains, Available for Sale	4,338	4,388
Gross Unrealized Losses, Available for Sale	(5,642)	(9,403)
Fair Value, Available for Sale	728,161	741,375
Gross Amortized Cost, Held for Investment Securities	209,047	207,904
Gross Unrealized Gains, Held for Investment Securities	3,889	1,507
Gross Unrealized Losses, Held for Investment Securities	(574)	(623)
Fair Value Held To Maturity	212,362	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	3,832	3,876
Gross Unrealized Gains, Available for Sale	97	23
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	3,929	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	117,458	123,981
Gross Unrealized Gains, Available for Sale	1,281	1,501
Gross Unrealized Losses, Available for Sale	(247)	(423)
Fair Value, Available for Sale	118,492	125,059
Gross Amortized Cost, Held for Investment Securities	65,787	67,535
Gross Unrealized Gains, Held for Investment Securities	2,126	812
Gross Unrealized Losses, Held for Investment Securities	0	0
Fair Value Held To Maturity	67,913	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	257,486	352,483
Gross Unrealized Gains, Available for Sale	1,158	1,075
Gross Unrealized Losses, Available for Sale	(2,737)	(6,077)
Fair Value, Available for Sale	255,907	347,481
Gross Amortized Cost, Held for Investment Securities	93,646	114,541
Gross Unrealized Gains, Held for Investment Securities	1,652	695
Gross Unrealized Losses, Held for Investment Securities	(27)	(280)
Fair Value Held To Maturity	95,271	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	32,494	29,967
Gross Unrealized Gains, Available for Sale	17	291
Gross Unrealized Losses, Available for Sale	(295)	0
Fair Value, Available for Sale	32,216	30,258
Fair Value Held To Maturity	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	82,183	85,175
Gross Unrealized Gains, Available for Sale	782	688
Gross Unrealized Losses, Available for Sale	(777)	(728)
Fair Value, Available for Sale	82,188	85,135
Gross Amortized Cost, Held for Investment Securities	8,314
Gross Unrealized Gains, Held for Investment Securities	0
Gross Unrealized Losses, Held for Investment Securities	(82)
Fair Value Held To Maturity	8,232
Collateralized loan obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	124,464	127,397
Gross Unrealized Gains, Available for Sale	37	0
Gross Unrealized Losses, Available for Sale	(1,054)	(2,172)
Fair Value, Available for Sale	123,447	125,225
Gross Amortized Cost, Held for Investment Securities	41,300	25,828
Gross Unrealized Gains, Held for Investment Securities	111	0
Gross Unrealized Losses, Held for Investment Securities	(465)	(343)
Fair Value Held To Maturity	40,946	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	32,277	23,511
Gross Unrealized Gains, Available for Sale	818	810
Gross Unrealized Losses, Available for Sale	(58)	(3)
Fair Value, Available for Sale	33,037	$ 24,318
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	40,015
Gross Unrealized Gains, Available for Sale	94
Gross Unrealized Losses, Available for Sale	(191)
Fair Value, Available for Sale	39,918
Fair Value Held To Maturity	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	39,256
Gross Unrealized Gains, Available for Sale	54
Gross Unrealized Losses, Available for Sale	(283)
Fair Value, Available for Sale	39,027
Fair Value Held To Maturity	$ 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.

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-Publisher FASB

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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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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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