INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Available for Sale) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	$ 22,198	$ 14,799
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	206,910	226,796
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	121,322	250,522
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	1,100,076	1,117,065
Available-for-sale Securities, Amortized Cost	1,450,506	1,609,182
Available-for-sale Securities, Gross Unrealized Gains	22,497	22,319
Available-for-sale Securities, Gross Unrealized Losses	(11,451)	(19,756)
Available-for-sale Securities, Fair Value	1,461,552	1,611,745
Available-for-sale Securities Weighted Average Yield	2.25%	2.18%
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	22,430	14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value	211,554	233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value	121,748	250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value	1,105,820	1,112,620
Available-for-sale Securities Weighted Average Yield With In One Year	2.54%	2.17%
Available-for-sale Securities Weighted Average Yield After One Through Five Years	2.27%	2.23%
Available-for-sale Securities Weighted Average Yield After Five Through Ten Years	2.27%	1.81%
Available-for-sale Securities Weighted Average Yield After Ten Years	2.23%	2.24%
U.S. Government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	8,355	8,450
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	29,981	40,243
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	20,125	88,666
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	155,035	135,679
Available-for-sale Securities, Amortized Cost	213,496	273,038
Available-for-sale Securities, Gross Unrealized Gains	3,989	3,525
Available-for-sale Securities, Gross Unrealized Losses	(292)	(664)
Available-for-sale Securities, Fair Value	217,193	275,899
Available-for-sale Securities Weighted Average Yield	1.33%	1.34%
Residential mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	270	0
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	65,773	43,943
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	43,199	115,731
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	914,904	951,454
Available-for-sale Securities, Amortized Cost	1,024,146	1,111,128
Available-for-sale Securities, Gross Unrealized Gains	14,034	12,873
Available-for-sale Securities, Gross Unrealized Losses	(10,613)	(18,214)
Available-for-sale Securities, Fair Value	1,027,567	1,105,787
Available-for-sale Securities Weighted Average Yield	2.37%	2.32%
Commercial mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	0	0
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	782	0
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	0	793
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	0	0
Available-for-sale Securities, Amortized Cost	782	793
Available-for-sale Securities, Gross Unrealized Gains	55	63
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Fair Value	837	856
Available-for-sale Securities Weighted Average Yield	4.95%	4.94%
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	1,612	1,369
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	838	2,035
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	0	200
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	28,387	28,432
Available-for-sale Securities, Amortized Cost	30,837	32,036
Available-for-sale Securities, Gross Unrealized Gains	74	81
Available-for-sale Securities, Gross Unrealized Losses	0	(560)
Available-for-sale Securities, Fair Value	30,911	31,557
Available-for-sale Securities Weighted Average Yield	1.15%	1.26%
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	11,961	4,980
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	109,536	140,575
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	57,998	45,132
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	0	0
Available-for-sale Securities, Amortized Cost	179,495	190,687
Available-for-sale Securities, Gross Unrealized Gains	4,345	5,777
Available-for-sale Securities, Gross Unrealized Losses	(505)	(261)
Available-for-sale Securities, Fair Value	183,335	196,203
Available-for-sale Securities Weighted Average Yield	2.81%	2.69%
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Maturities With In One Year, Amortized Cost	0	0
Available-for-sale Securities, Maturities After One Through Five Years, Amortized Cost	0	0
Available-for-sale Securities, Maturities After Five Through Ten Years, Amortized Cost	0	0
Available-for-sale Securities, Maturities After Ten Years, Amortized Cost	1,750	1,500
Available-for-sale Securities, Amortized Cost	1,750	1,500
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	(41)	(57)
Available-for-sale Securities, Fair Value	1,709	1,443
Available-for-sale Securities Weighted Average Yield	2.10%	2.17%
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	0	0
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value	0	0
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value	0	0
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value	1,709	1,443
Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	22,430	14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value	211,554	233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value	121,748	250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value	$ 1,104,111	$ 1,111,177