INTEREST-BEARING DEPOSITS AND SECURITIES (Available-for-sale Securities with Continuous Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Document Period End Date	Jun. 30, 2013
Less than 12 Months, Fair Value	$ 342,276	$ 136,877
Less than 12 Months, Unrealized Losses	(7,168)	(988)
12 Months or More, Fair Value	10,911	5,746
12 Months or Longer, Unrealized Losses	(257)	(81)
Total Fair Value	353,187	142,623
Unrealized Losses	(7,425)	(1,069)
U.S. Government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	41,901	22,955
Less than 12 Months, Unrealized Losses	(851)	(53)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	41,901	22,955
Unrealized Losses	(851)	(53)
Total municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	31,753	15,628
Less than 12 Months, Unrealized Losses	(524)	(78)
12 Months or More, Fair Value	381	0
12 Months or Longer, Unrealized Losses	(1)	0
Total Fair Value	32,134	15,628
Unrealized Losses	(525)	(78)
Taxable municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	18,244	11,009
Less than 12 Months, Unrealized Losses	(231)	(67)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	18,244	11,009
Unrealized Losses	(231)	(67)
Tax exempt municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	13,509	4,619
Less than 12 Months, Unrealized Losses	(293)	(11)
12 Months or More, Fair Value	381	0
12 Months or Longer, Unrealized Losses	(1)	0
Total Fair Value	13,890	4,619
Unrealized Losses	(294)	(11)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	4,961	6,670
Less than 12 Months, Unrealized Losses	(39)	(9)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	4,961	6,670
Unrealized Losses	(39)	(9)
Total mortgage-backed or related securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	238,704	71,908
Less than 12 Months, Unrealized Losses	(5,054)	(774)
12 Months or More, Fair Value	10,530	5,746
12 Months or Longer, Unrealized Losses	(256)	(81)
Total Fair Value	249,234	77,654
Unrealized Losses	(5,310)	(855)
1-4 residential agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	13,489	32,459
Less than 12 Months, Unrealized Losses	(821)	(503)
12 Months or More, Fair Value	10,530	5,746
12 Months or Longer, Unrealized Losses	(256)	(81)
Total Fair Value	24,019	38,205
Unrealized Losses	(1,077)	(584)
Multifamily agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	215,156	32,170
Less than 12 Months, Unrealized Losses	(3,639)	(226)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	215,156	32,170
Unrealized Losses	(3,639)	(226)
Multifamily other [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	10,059	7,279
Less than 12 Months, Unrealized Losses	(594)	(45)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	10,059	7,279
Unrealized Losses	(594)	(45)
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	24,957	19,716
Less than 12 Months, Unrealized Losses	(700)	(74)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	24,957	19,716
Unrealized Losses	(700)	(74)
SLMA [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	15,497	9,674
Less than 12 Months, Unrealized Losses	(94)	(45)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	15,497	9,674
Unrealized Losses	(94)	(45)
Other asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	9,460	10,042
Less than 12 Months, Unrealized Losses	(606)	(29)
12 Months or More, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value	9,460	10,042
Unrealized Losses	$ (606)	$ (29)