INTEREST-BEARING DEPOSITS AND SECURITIES (Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 473,908	$ 469,650
Gross Unrealized Gains	3,831	4,339
Gross Unrealized Losses	(1,056)	(1,069)
Fair Value	476,683	472,920
Percent of Total	100.00%	100.00%
U.S. Government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	78,085	96,666
Gross Unrealized Gains	295	367
Gross Unrealized Losses	(38)	(53)
Fair Value	78,342	96,980
Percent of Total	16.40%	20.50%
Total municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	61,885	44,562
Gross Unrealized Gains	486	454
Gross Unrealized Losses	(93)	(78)
Fair Value	62,278	44,938
Percent of Total	13.10%	9.50%
Taxable municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	32,613	20,987
Gross Unrealized Gains	232	233
Gross Unrealized Losses	(39)	(67)
Fair Value	32,806	21,153
Percent of Total	6.90%	4.50%
Tax exempt municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	29,272	23,575
Gross Unrealized Gains	254	221
Gross Unrealized Losses	(54)	(11)
Fair Value	29,472	23,785
Percent of Total	6.20%	5.00%
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	10,629	10,701
Gross Unrealized Gains	35	37
Gross Unrealized Losses	(1)	(9)
Fair Value	10,663	10,729
Percent of Total	2.20%	2.30%
Total mortgage-backed or related securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	272,893	275,341
Gross Unrealized Gains	2,842	3,271
Gross Unrealized Losses	(835)	(855)
Fair Value	274,900	277,757
Percent of Total	57.70%	58.70%
1-4 residential agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	72,468	87,392
Gross Unrealized Gains	954	1,051
Gross Unrealized Losses	(552)	(584)
Fair Value	72,870	87,859
Percent of Total	15.30%	18.60%
1-4 residential other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	1,195	1,223
Gross Unrealized Gains	87	76
Gross Unrealized Losses	0	0
Fair Value	1,282	1,299
Percent of Total	0.30%	0.30%
Multifamily agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	188,553	176,026
Gross Unrealized Gains	1,691	2,140
Gross Unrealized Losses	(283)	(226)
Fair Value	189,961	177,940
Percent of Total	39.80%	37.60%
Multifamily other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	10,677	10,700
Gross Unrealized Gains	110	4
Gross Unrealized Losses	0	(45)
Fair Value	10,787	10,659
Percent of Total	2.30%	2.20%
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	50,416	42,380
Gross Unrealized Gains	173	210
Gross Unrealized Losses	(89)	(74)
Fair Value	50,500	42,516
Percent of Total	10.60%	9.00%
SLMA [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	32,083	32,309
Gross Unrealized Gains	173	210
Gross Unrealized Losses	(17)	(45)
Fair Value	32,239	32,474
Percent of Total	6.80%	6.90%
Other asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	18,333	10,071
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(72)	(29)
Fair Value	$ 18,261	$ 10,042
Percent of Total	3.80%	2.10%