SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 521,305	$ 658,458
Gross Unrealized Gains, Available for Sale	4,780	3,156
Gross Unrealized Losses, Available for Sale	(7,732)	(20,003)
Fair Value, Available for Sale	518,353	641,611
Gross Amortized Cost, Held for Investment Securities	156,498
Gross Unrealized Gains, Held for Investment Securities	215
Gross Unrealized Losses, Held for Investment Securities	(778)
Fair Value Held To Maturity	155,935
US Treasury Securities and 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	100	100
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	100	100
Mortgage-backed Securities, Issued by 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	104,837	129,468
Gross Unrealized Gains, Available for Sale	2,192	1,456
Gross Unrealized Losses, Available for Sale	(512)	(4,189)
Fair Value, Available for Sale	106,517	126,735
Gross Amortized Cost, Held for Investment Securities	46,764
Gross Unrealized Gains, Held for Investment Securities	169
Gross Unrealized Losses, Held for Investment Securities	0
Fair Value Held To Maturity	46,933
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	272,160	383,392
Gross Unrealized Gains, Available for Sale	785	776
Gross Unrealized Losses, Available for Sale	(6,586)	(14,747)
Fair Value, Available for Sale	266,359	369,421
Gross Amortized Cost, Held for Investment Securities	109,734
Gross Unrealized Gains, Held for Investment Securities	46
Gross Unrealized Losses, Held for Investment Securities	(778)
Fair Value Held To Maturity	109,002
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	29,876	29,800
Gross Unrealized Gains, Available for Sale	276	0
Gross Unrealized Losses, Available for Sale	0	(226)
Fair Value, Available for Sale	30,152	29,574
Gross Amortized Cost, Held for Investment Securities	0
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	75,907	76,520
Gross Unrealized Gains, Available for Sale	1,021	731
Gross Unrealized Losses, Available for Sale	(236)	(413)
Fair Value, Available for Sale	76,692	76,838
Gross Amortized Cost, Held for Investment Securities	0
Fair Value Held To Maturity	0
Collateralized Loan Obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	32,658	32,592
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(398)	(413)
Fair Value, Available for Sale	32,260	32,179
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	5,767	6,586
Gross Unrealized Gains, Available for Sale	506	193
Gross Unrealized Losses, Available for Sale	0	(15)
Fair Value, Available for Sale	$ 6,273	$ 6,764