SECURITIES - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	$ 223,061us-gaap_HeldToMaturitySecurities	$ 207,904us-gaap_HeldToMaturitySecurities
Held for Investment, Fair Value, Total	226,506	208,788
Gross Amortized Cost, Held for Investment Securities	223,061	207,904
Collateralized Loan Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Due in less than one year	0
Held for Investment, Fair Value, Due in less than one year	0
Available for Sale Amortized Cost, Due in less than one year	0
Available for Sale, Fair Value, Due in less than one year	0
Held for Investment, Amortized Cost, Due after one year through five years	4,838
Held for Investment, Fair Value, Due after one year through five years	4,750
Available for Sale, Amortized Cost, Due after one year through five years	637
Available for Sale, Fair Value, Due after one year through five years	638
Held for Investment, Amortized Cost, Due after five years through ten years	36,461
Held for Investment, Fair Value, Due after five years through ten years	36,435
Available for Sale, Amortized Cost, Due after five years through ten years	8,298
Available for Sale, Fair Value, Due after five years through ten years	8,464
Held for Investment, Amortized Cost, Due after ten years	0
Held for Investment, Fair Value, Due after ten years	0
Available for Sale, Amortized Cost, Due after ten years	145,494
Available for Sale, Fair Value, Due after ten years	145,224
Held for Investment, Amortized Cost, Total	41,299
Held for Investment, Fair Value, Total	41,185
Available for Sale, Amortized Cost, Total	154,429
Available for Sale, Fair Value, Total	154,326
Gross Amortized Cost, Available for Sale	154,429
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	68,167	68,347
Available for Sale, Amortized Cost, Total	117,961
Gross Amortized Cost, Held for Investment Securities	66,291	67,535
Gross Amortized Cost, Available for Sale	117,961
Fair Value, Available for Sale	119,491
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	108,531	114,956
Available for Sale, Amortized Cost, Total	334,248
Gross Amortized Cost, Held for Investment Securities	106,763	114,541
Gross Amortized Cost, Available for Sale	334,248
Fair Value, Available for Sale	332,687
Private mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	0
Available for Sale, Amortized Cost, Total	30,011
Gross Amortized Cost, Held for Investment Securities	0
Gross Amortized Cost, Available for Sale	30,011
Fair Value, Available for Sale	29,840
Private collateralized mortgage obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	8,624
Available for Sale, Amortized Cost, Total	94,072
Gross Amortized Cost, Held for Investment Securities	8,708
Gross Amortized Cost, Available for Sale	94,072
Fair Value, Available for Sale	93,888
No Contractual Maturity [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	226,506
Available for Sale, Amortized Cost, Total	730,721
Gross Amortized Cost, Held for Investment Securities	223,061
Gross Amortized Cost, Available for Sale	730,721
Fair Value, Available for Sale	$ 730,232

Available for sale securities debt maturities aggregate fair value.

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This item represents the cost of debt 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 after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount after other than temporary impairment (OTTI) accretion, of 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 held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)(1)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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