INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2015 USD ($) Position	Dec. 31, 2014 USD ($) Position
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	46	28
12 months or longer | Position	24	71
Total | Position	70	99
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 389,937	$ 16,458
12 months or longer	33,551	166,383
Total	423,488	182,841
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	2,236	35
12 months or longer	1,183	2,219
Total	$ 3,419	$ 2,254
U.S. Treasury and Agency Securities [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	9	0
12 months or longer | Position	0	4
Total | Position	9	4
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 353,844	$ 0
12 months or longer	0	102,363
Total	353,844	102,363
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	2,027	0
12 months or longer	0	910
Total	$ 2,027	$ 910
Obligations of State and Political Subdivisions [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	18	23
12 months or longer | Position	2	46
Total | Position	20	69
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 8,804	$ 13,413
12 months or longer	735	26,490
Total	9,539	39,903
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	34	34
12 months or longer	25	210
Total	$ 59	$ 244
Government Agency Mortgage-Backed Securities [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	17	3
12 months or longer | Position	19	19
Total | Position	36	22
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 24,178	$ 5
12 months or longer	30,103	34,770
Total	54,281	34,775
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	161	0
12 months or longer	1,100	1,025
Total	$ 1,261	$ 1,025
Corporate Debt Securities [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	1	1
12 months or longer | Position	1	1
Total | Position	2	2
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 3,024	$ 3,040
12 months or longer	2,710	2,755
Total	5,734	5,795
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	0	1
12 months or longer	58	74
Total	$ 58	$ 75
Government Agency Collateralized Mortgage Obligations [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	0	1
12 months or longer | Position	2	1
Total | Position	2	2
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 0	$ 0
12 months or longer	3	5
Total	3	5
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	0	0
Total	$ 0	$ 0
Marketable Equity Security [Member]
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]
Less than 12 months | Position	1
12 months or longer | Position	0
Total | Position	1
Available-for-Sale Securities, in Unrealized Loss Position, Fair value [Abstract]
Less than 12 months	$ 87
12 months or longer	0
Total	87
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]
Less than 12 months	14
12 months or longer	0
Total	$ 14