LOANS AND ALLOWANCE FOR LOAN LOSSES (Allowance for Credit Losses on Financing Receivables By Portfolio Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowance for loan losses:
Balance, beginning of period	$ 66,874	$ 81,033
Charge-offs	(4,744)	(3,447)
Recoveries	2,012	2,245
Provision (benefit) for loan losses	0	0
Balance, end of period	64,142	79,831
Commercial and Industrial [Member]
Allowance for loan losses:
Balance, beginning of period	12,574	13,401
Charge-offs	(2,987)	(1,622)
Recoveries	1,244	752
Provision (benefit) for loan losses	1,501	1,340
Balance, end of period	12,332	13,871
Real Estate Construction and Development [Member]
Allowance for loan losses:
Balance, beginning of period	3,490	7,407
Charge-offs	(40)	(30)
Recoveries	164	600
Provision (benefit) for loan losses	(860)	(891)
Balance, end of period	2,754	7,086
One-to-Four-Family Residential [Member]
Allowance for loan losses:
Balance, beginning of period	24,055	32,619
Charge-offs	(1,163)	(1,426)
Recoveries	500	791
Provision (benefit) for loan losses	(906)	(764)
Balance, end of period	22,486	31,220
Multi-family residential [Member]
Allowance for loan losses:
Balance, beginning of period	5,630	5,249
Charge-offs	(189)	(132)
Recoveries	56	7
Provision (benefit) for loan losses	77	145
Balance, end of period	5,574	5,269
Commercial Real Estate [Member]
Allowance for loan losses:
Balance, beginning of period	20,983	22,052
Charge-offs	(343)	(188)
Recoveries	21	57
Provision (benefit) for loan losses	225	122
Balance, end of period	20,886	22,043
Consumer and installment [Member]
Allowance for loan losses:
Balance, beginning of period	142	305
Charge-offs	(22)	(49)
Recoveries	27	38
Provision (benefit) for loan losses	(37)	48
Balance, end of period	$ 110	$ 342