LOANS AND ALLOWANCE FOR LOAN LOSSES (Impairment Method by Loan Category) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	$ 918,000	$ 2,237,000
Ending balance: Impaired loans collectively evaluated for impairment	9,505,000	10,234,000
Ending balance: All other loans collectively evaluated for impairment	53,719,000	54,403,000
Balance, end of period	64,142,000	66,874,000	79,831,000	81,033,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	30,702,000	37,541,000
Ending balance: Impaired loans collectively evaluated for impairment	98,269,000	100,554,000
Ending balance: All other loans collectively evaluated for impairment	3,020,771,000	2,979,737,000
Total loans held for portfolio	3,149,742,000	3,117,832,000
Commercial and Industrial [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	0	1,053,000
Ending balance: Impaired loans collectively evaluated for impairment	479,000	573,000
Ending balance: All other loans collectively evaluated for impairment	11,853,000	10,948,000
Balance, end of period	12,332,000	12,574,000	13,871,000	13,401,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	2,505,000	4,712,000
Ending balance: Impaired loans collectively evaluated for impairment	5,007,000	5,058,000
Ending balance: All other loans collectively evaluated for impairment	692,671,000	685,497,000
Total loans held for portfolio	700,183,000	695,267,000
Real Estate Construction and Development [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	0	0
Ending balance: Impaired loans collectively evaluated for impairment	231,000	219,000
Ending balance: All other loans collectively evaluated for impairment	2,523,000	3,271,000
Balance, end of period	2,754,000	3,490,000	7,086,000	7,407,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	2,622,000	2,626,000
Ending balance: Impaired loans collectively evaluated for impairment	1,005,000	1,109,000
Ending balance: All other loans collectively evaluated for impairment	107,078,000	86,116,000
Total loans held for portfolio	110,705,000	89,851,000
One-to-Four-Family Residential [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	918,000	1,184,000
Ending balance: Impaired loans collectively evaluated for impairment	7,325,000	7,821,000
Ending balance: All other loans collectively evaluated for impairment	14,243,000	15,050,000
Balance, end of period	22,486,000	24,055,000	31,220,000	32,619,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	6,899,000	7,388,000
Ending balance: Impaired loans collectively evaluated for impairment	87,889,000	89,561,000
Ending balance: All other loans collectively evaluated for impairment	935,300,000	919,761,000
Total loans held for portfolio	1,030,088,000	1,016,710,000
Multi-family residential [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	0	0
Ending balance: Impaired loans collectively evaluated for impairment	1,212,000	1,157,000
Ending balance: All other loans collectively evaluated for impairment	4,362,000	4,473,000
Balance, end of period	5,574,000	5,630,000	5,269,000	5,249,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	18,676,000	19,050,000
Ending balance: Impaired loans collectively evaluated for impairment	318,000	681,000
Ending balance: All other loans collectively evaluated for impairment	95,294,000	95,703,000
Total loans held for portfolio	114,288,000	115,434,000
Commercial Real Estate [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	0	0
Ending balance: Impaired loans collectively evaluated for impairment	258,000	463,000
Ending balance: All other loans collectively evaluated for impairment	20,628,000	20,520,000
Balance, end of period	20,886,000	20,983,000	22,043,000	22,052,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	0	3,765,000
Ending balance: Impaired loans collectively evaluated for impairment	4,046,000	4,122,000
Ending balance: All other loans collectively evaluated for impairment	1,170,753,000	1,175,155,000
Total loans held for portfolio	1,174,799,000	1,183,042,000
Consumer and Installment and Net Deferred Loan Fees [Member]
Allowance for loan losses:
Ending balance: Impaired loans individually evaluated for impairment	0	0
Ending balance: Impaired loans collectively evaluated for impairment	0	1,000
Ending balance: All other loans collectively evaluated for impairment	110,000	141,000
Balance, end of period	110,000	142,000	342,000	305,000
Total loans:
Ending balance: Impaired loans individually evaluated for impairment	0	0
Ending balance: Impaired loans collectively evaluated for impairment	4,000	23,000
Ending balance: All other loans collectively evaluated for impairment	19,675,000	17,505,000
Total loans held for portfolio	$ 19,679,000	$ 17,528,000