LOANS AND ALLOWANCE FOR LOAN LOSSES (Impairment Method by Loan Category) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	$ 3,756	$ 3,598
Ending balance: impaired loans collectively evaluated for impairment	11,675	14,354
Ending balance: all other loans collectively evaluated for impairment	65,602	73,650
Ending balance: Total	81,033	91,602	137,710	201,033
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	57,005	119,483
Ending balance: impaired loans collectively evaluated for impairment	106,578	119,306
Ending balance: all other loans collectively evaluated for impairment	2,667,964	2,625,825
Ending balance: Total	2,831,547	2,864,614
Commercial and Industrial
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	0	75
Ending balance: impaired loans collectively evaluated for impairment	497	601
Ending balance: all other loans collectively evaluated for impairment	12,904	12,896
Ending balance: Total	13,401	13,572	27,243
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	3,480	7,884
Ending balance: impaired loans collectively evaluated for impairment	7,043	11,166
Ending balance: all other loans collectively evaluated for impairment	590,181	591,251
Ending balance: Total	600,704	610,301
Real Estate Construction and Development
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	62	121
Ending balance: impaired loans collectively evaluated for impairment	232	1,331
Ending balance: all other loans collectively evaluated for impairment	7,113	12,982
Ending balance: Total	7,407	14,434	24,868
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	3,440	39,155
Ending balance: impaired loans collectively evaluated for impairment	1,474	3,028
Ending balance: all other loans collectively evaluated for impairment	116,748	132,796
Ending balance: Total	121,662	174,979
One-to- Four-Family Residential
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	2,275	3,187
Ending balance: impaired loans collectively evaluated for impairment	8,937	10,455
Ending balance: all other loans collectively evaluated for impairment	21,407	25,255
Ending balance: Total	32,619	38,897	50,864
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	12,276	16,843
Ending balance: impaired loans collectively evaluated for impairment	93,301	98,423
Ending balance: all other loans collectively evaluated for impairment	815,911	871,501
Ending balance: Total	921,488	986,767
Multi- Family Residential
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	1,034	33
Ending balance: impaired loans collectively evaluated for impairment	1,404	1,105
Ending balance: all other loans collectively evaluated for impairment	2,811	3,114
Ending balance: Total	5,249	4,252	4,851
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	28,641	34,636
Ending balance: impaired loans collectively evaluated for impairment	1,107	365
Ending balance: all other loans collectively evaluated for impairment	91,556	68,683
Ending balance: Total	121,304	103,684
Commercial Real Estate
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	385	182
Ending balance: impaired loans collectively evaluated for impairment	605	861
Ending balance: all other loans collectively evaluated for impairment	21,062	19,005
Ending balance: Total	22,052	20,048	29,448
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	9,168	20,965
Ending balance: impaired loans collectively evaluated for impairment	3,634	6,296
Ending balance: all other loans collectively evaluated for impairment	1,035,432	942,419
Ending balance: Total	1,048,234	969,680
Consumer and Installment
Allowance for loan losses:
Ending balance: impaired loans individually evaluated for impairment	0	0
Ending balance: impaired loans collectively evaluated for impairment	0	1
Ending balance: all other loans collectively evaluated for impairment	305	398
Ending balance: Total	305	399	436
Financing receivables:
Ending balance: impaired loans individually evaluated for impairment	0	0
Ending balance: impaired loans collectively evaluated for impairment	19	28
Ending balance: all other loans collectively evaluated for impairment	18,136	19,175
Ending balance: Total	$ 18,155	$ 19,203