INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Held to Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	$ 561	$ 640
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	105,995	16,902
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	61,726	199,107
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	449,866	523,537
Held-to-maturity Securities, Amortized Cost	618,148	740,186
Held-to-maturity Securities, Gross Unrealized Gains	1,974	443
Held-to-maturity Securities, Gross Unrealized Losses	(5,850)	(21,446)
Held-to-maturity Securities, Fair Value	614,272	719,183
Held to maturity Securities Weighted Average Yield	1.85%	1.86%
Held to maturity Securities Weighted Average Yield With In One Year	3.07%	3.32%
Held to maturity Securities Weighted Average Yield After One Through Five Years	1.88%	2.20%
Held to maturity Securities Weighted Average Yield After Five Through Ten Years	1.13%	1.53%
Held to maturity Securities Weighted Average Yield After Ten Years	1.94%	1.97%
U.S. Government sponsored agencies [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	10,725	16,119
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Amortized Cost	10,725	16,119
Held-to-maturity Securities, Gross Unrealized Gains	42	0
Held-to-maturity Securities, Gross Unrealized Losses	0	(153)
Held-to-maturity Securities, Fair Value	10,767	15,966
Held to maturity Securities Weighted Average Yield	1.25%	1.14%
Residential mortgage-backed [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	105,660	16,327
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	50,512	182,933
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	448,905	522,504
Held-to-maturity Securities, Amortized Cost	605,077	721,764
Held-to-maturity Securities, Gross Unrealized Gains	1,931	441
Held-to-maturity Securities, Gross Unrealized Losses	(5,782)	(21,206)
Held-to-maturity Securities, Fair Value	601,226	700,999
Held to maturity Securities Weighted Average Yield	1.86%	1.88%
State and political subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	561	640
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	335	575
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	489	55
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	961	1,033
Held-to-maturity Securities, Amortized Cost	2,346	2,303
Held-to-maturity Securities, Gross Unrealized Gains	1	2
Held-to-maturity Securities, Gross Unrealized Losses	(68)	(87)
Held-to-maturity Securities, Fair Value	2,279	2,218
Held to maturity Securities Weighted Average Yield	1.68%	1.93%
Debt securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Fair Value	561	642
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Fair Value	106,147	16,926
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Fair Value	62,000	195,647
Held-to-maturity Securities, Debt Maturities, After Ten Years, Fair Value	$ 445,564	$ 505,968