SECURITIES (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands	Sep. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	32	109
Fair Value - Less Than 12 Months	$ 36,707	$ 347,651
Unrealized Losses - Less Than 12 Months	(90)	(3,432)
Fair Value - 12 Months of More	111,341	192,809
Unrealized Losses - 12 Months or More	(966)	(6,709)
Fair Value	148,048	540,460
Unrealized losses	(1,056)	(10,141)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,382	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7)	(61)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve 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	1,382	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(7)	(61)
AFS and HTM securities in Continues Unrealized Loss Position	$ 149,400	$ 546,000
Unrealized Loss as a Percent of Fair Value	1.00%	2.00%
AFS and HTM Securities Unrealized Loss Accumulated in Investments	$ 1,100	$ 10,200
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - 12 Months of More	$ 111,300	$ 192,800
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	30	28
AFS and HTM Securities Unrealized Loss Accumulated in Investments	$ 966	$ 6,700
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	3,071	234,897
Unrealized Losses - Less Than 12 Months	(5)	(2,351)
Fair Value - 12 Months of More	32,128	45,629
Unrealized Losses - 12 Months or More	(152)	(1,506)
Fair Value	35,199	280,526
Unrealized losses	(157)	(3,857)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	33,636	111,143
Unrealized Losses - Less Than 12 Months	(85)	(1,068)
Fair Value - 12 Months of More	79,213	147,180
Unrealized Losses - 12 Months or More	(814)	(5,203)
Fair Value	112,849	258,323
Unrealized losses	(899)	(6,271)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		996
Unrealized Losses - Less Than 12 Months		(4)
Fair Value - 12 Months of More		0
Unrealized Losses - 12 Months or More		0
Fair Value		996
Unrealized losses		(4)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		615
Unrealized Losses - Less Than 12 Months		(9)
Fair Value - 12 Months of More		0
Unrealized Losses - 12 Months or More		0
Fair Value		615
Unrealized losses		(9)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,382	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7)	(61)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve 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	1,382	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (7)	$ (61)