SECURITIES (Securities with Continuous Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 177,670	$ 637,744
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,290	5,270
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	58,178	89,748
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	323	1,085
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	235,848	727,492
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,613	6,355
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6,085	63,038
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	76	511
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,458	509
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	7,543	63,547
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	87	516
U.S. Government and agency obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	10,792	8,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	42	97
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	10,439	10,489
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9	96
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	21,231	19,196
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	51	193
Municipal bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6,892	69,848
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	35	426
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	906	905
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,798	70,753
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	39	432
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,179	28,545
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30	188
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,229	254
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	3
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	4,408	28,799
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	41	191
Corporate bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	9,943	5,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	804	12
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,943	5,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	804	12
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Mortgage-backed or related securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	119,249	533,143
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	925	4,380
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	46,833	68,562
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	310	735
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	166,082	601,705
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,235	5,115
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,906	34,493
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	46	323
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	229	255
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,135	34,748
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	46	325
Asset-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	30,794	20,893
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	484	355
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	9,792
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	248
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	30,794	30,685
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 484	$ 603