INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Available for Sale) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities Maturities With In One Year Amortized Cost	$ 15,067	$ 14,799
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost	181,169	226,796
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	148,701	250,522
Available-for-sale Securities Maturities After Ten Years Amortized Cost	1,053,734	1,117,065
Available-for-sale Securities, Amortized Cost Basis	1,398,671	1,609,182
Available-for-sale Securities, Gross Unrealized Gains	23,138	22,319
Available-for-sale Securities, Gross Unrealized Losses	(13,637)	(19,756)
Available-for-sale Securities, Fair Value	1,408,172	1,611,745
Available-for-sale Securities Weighted Average Yield	2.26%	2.18%
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	15,135	14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value	186,936	233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value	148,797	250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value	1,057,304	1,112,620
Available-for-sale Securities Weighted Average Yield With In One Year	2.21%	2.17%
Available-for-sale Securities Weighted Average Yield After One Through Five Years	2.39%	2.23%
Available-for-sale Securities Weighted Average Yield After Five Through Ten Years	2.10%	1.81%
Available-for-sale Securities Weighted Average Yield After Ten Years	2.26%	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	8,418	8,450
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost	30,058	40,243
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	20,136	88,666
Available-for-sale Securities Maturities After Ten Years Amortized Cost	132,248	135,679
Available-for-sale Securities, Amortized Cost Basis	190,860	273,038
Available-for-sale Securities, Gross Unrealized Gains	4,281	3,525
Available-for-sale Securities, Gross Unrealized Losses	(47)	(664)
Available-for-sale Securities, Fair Value	195,094	275,899
Available-for-sale Securities Weighted Average Yield	1.37%	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	282	0
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost	28,277	43,943
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	82,445	115,731
Available-for-sale Securities Maturities After Ten Years Amortized Cost	891,319	951,454
Available-for-sale Securities, Amortized Cost Basis	1,002,323	1,111,128
Available-for-sale Securities, Gross Unrealized Gains	13,662	12,873
Available-for-sale Securities, Gross Unrealized Losses	(12,540)	(18,214)
Available-for-sale Securities, Fair Value	1,003,445	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	0	0
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	789	793
Available-for-sale Securities Maturities After Ten Years Amortized Cost	0	0
Available-for-sale Securities, Amortized Cost Basis	789	793
Available-for-sale Securities, Gross Unrealized Gains	62	63
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Fair Value	851	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	1,367	1,369
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost	1,681	2,035
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	200	200
Available-for-sale Securities Maturities After Ten Years Amortized Cost	28,417	28,432
Available-for-sale Securities, Amortized Cost Basis	31,665	32,036
Available-for-sale Securities, Gross Unrealized Gains	67	81
Available-for-sale Securities, Gross Unrealized Losses	(392)	(560)
Available-for-sale Securities, Fair Value	31,340	31,557
Available-for-sale Securities Weighted Average Yield	1.23%	1.26%
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities Maturities With In One Year Amortized Cost	5,000	4,980
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost	121,153	140,575
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost	45,131	45,132
Available-for-sale Securities Maturities After Ten Years Amortized Cost	0	0
Available-for-sale Securities, Amortized Cost Basis	171,284	190,687
Available-for-sale Securities, Gross Unrealized Gains	5,066	5,777
Available-for-sale Securities, Gross Unrealized Losses	(599)	(261)
Available-for-sale Securities, Fair Value	175,751	196,203
Available-for-sale Securities Weighted Average Yield	2.82%	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 Basis	1,750	1,500
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	(59)	(57)
Available-for-sale Securities, Fair Value	1,691	1,443
Available-for-sale Securities Weighted Average Yield	2.13%	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	1,691	1,443
Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	15,135	14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value	186,936	233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value	148,797	250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value	$ 1,055,613	$ 1,111,177