CASH AND SECURITIES (Available-for-sale Securities with Continuous Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 123,351	$ 292,992
Less than 12 Months, Unrealized Losses	(355)	(4,803)
12 Months or More, Fair Value	134,007	44,064
12 Months or More, Unrealized Losses	(1,860)	(1,507)
Total Fair Value	257,358	337,056
Unrealized Losses	(2,215)	(6,310)
U.S. Government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	15,983	39,621
Less than 12 Months, Unrealized Losses	(58)	(633)
12 Months or More, Fair Value	9,847	998
12 Months or More, Unrealized Losses	(153)	(2)
Total Fair Value	25,830	40,619
Unrealized Losses	(211)	(635)
Total municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	16,322	23,797
Less than 12 Months, Unrealized Losses	(61)	(466)
12 Months or More, Fair Value	7,129	900
12 Months or More, Unrealized Losses	(60)	(20)
Total Fair Value	23,451	24,697
Unrealized Losses	(121)	(486)
Taxable municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	7,247	15,580
Less than 12 Months, Unrealized Losses	(23)	(261)
12 Months or More, Fair Value	3,461	413
12 Months or More, Unrealized Losses	(29)	(17)
Total Fair Value	10,708	15,993
Unrealized Losses	(52)	(278)
Tax exempt municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	9,075	8,217
Less than 12 Months, Unrealized Losses	(38)	(205)
12 Months or More, Fair Value	3,668	487
12 Months or More, Unrealized Losses	(31)	(3)
Total Fair Value	12,743	8,704
Unrealized Losses	(69)	(208)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value		4,961
Less than 12 Months, Unrealized Losses		(39)
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses		0
Total Fair Value		4,961
Unrealized Losses		(39)
Total Mortgage-backed or related securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	91,046	224,613
Less than 12 Months, Unrealized Losses	(236)	(3,665)
12 Months or More, Fair Value	107,266	32,656
12 Months or More, Unrealized Losses	(1,362)	(935)
Total Fair Value	198,312	257,269
Unrealized Losses	(1,598)	(4,600)
1-4 residential agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	6,287	14,972
Less than 12 Months, Unrealized Losses	(57)	(133)
12 Months or More, Fair Value	11,744	22,560
12 Months or More, Unrealized Losses	(183)	(705)
Total Fair Value	18,031	37,532
Unrealized Losses	(240)	(838)
Multifamily agency guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	76,309	199,407
Less than 12 Months, Unrealized Losses	(167)	(3,162)
12 Months or More, Fair Value	95,522	10,096
12 Months or More, Unrealized Losses	(1,179)	(230)
Total Fair Value	171,831	209,503
Unrealized Losses	(1,346)	(3,392)
Multifamily other [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	8,450	10,234
Less than 12 Months, Unrealized Losses	(12)	(370)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	8,450	10,234
Unrealized Losses	(12)	(370)
Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	9,765	9,510
12 Months or More, Unrealized Losses	(285)	(550)
Total Fair Value	9,765	9,510
Unrealized Losses	$ (285)	$ (550)