SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	$ 671,051	$ 658,458
Gross Unrealized Gains	3,694	3,156
Gross Unrealized Losses	(16,233)	(20,003)
Fair Value	658,512	641,611
U.S. Treasury Securities and Obligations of U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	100	100
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	100	100
Mortgage-Backed Securities of U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	153,330	129,468
Gross Unrealized Gains	1,516	1,456
Gross Unrealized Losses	(3,536)	(4,189)
Fair Value	151,310	126,735
Collateralized Mortgage Obligations of U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	369,042	383,392
Gross Unrealized Gains	680	776
Gross Unrealized Losses	(11,609)	(14,747)
Fair Value	358,113	369,421
Private Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	29,838	29,800
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(343)	(226)
Fair Value	29,495	29,574
Private Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	80,223	76,520
Gross Unrealized Gains	1,141	731
Gross Unrealized Losses	(331)	(413)
Fair Value	81,033	76,838
Collateralized Loan Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	32,624	32,592
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(409)	(413)
Fair Value	32,215	32,179
Obligations of State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Amortized Cost	5,894	6,586
Gross Unrealized Gains	357	193
Gross Unrealized Losses	(5)	(15)
Fair Value	$ 6,246	$ 6,764