INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Available for Sale) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 14,799	$ 11,400
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	226,796	245,011
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	250,522	269,997
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	1,117,065	1,466,809
Carrying value: Total Amortized Cost	1,609,182	1,993,217
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	22,319	51,774
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	19,756	1,264
Carrying value: Fair Value	1,611,745	2,043,727
Carrying value: Weighted Average Yield	2.18%	2.26%
Fair Value: Maturity, 1 Year or Less	14,927	11,476
Fair value: Maturity, 1-5 Years	233,338	251,558
Fair value: Maturity, 5-10 Years	250,860	275,251
Fair value: Maturity, After 10 Years	1,112,620	1,505,442
Weighted average yield, Maturity, 1 Year or Less	2.17%	2.01%
Weighted average yield, Maturity, 1-5 Years	2.23%	2.17%
Weighted average yield, Maturity, 5-10 Years	1.81%	2.65%
Weighted average yield, Maturity, After 10 Years	2.24%	2.21%
US Government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	8,450	10,051
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	40,243	80,328
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	88,666	0
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	135,679	213,892
Carrying value: Total Amortized Cost	273,038	304,271
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	3,525	6,304
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	664	146
Carrying value: Fair Value	275,899	310,429
Carrying value: Weighted Average Yield	1.34%	1.42%
Residential mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	0	364
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	43,943	24,014
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	115,731	219,286
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	951,454	1,251,917
Carrying value: Total Amortized Cost	1,111,128	1,495,581
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	12,873	38,983
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	18,214	497
Carrying value: Fair Value	1,105,787	1,534,067
Carrying value: Weighted Average Yield	2.32%	2.32%
Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	0	0
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	0	0
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	793	806
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	0	0
Carrying value: Total Amortized Cost	793	806
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	63	109
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	0
Carrying value: Fair Value	856	915
Carrying value: Weighted Average Yield	4.94%	4.86%
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	1,369	985
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	2,035	3,579
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	200	201
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	28,432	0
Carrying value: Total Amortized Cost	32,036	4,765
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	81	164
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	560	0
Carrying value: Fair Value	31,557	4,929
Carrying value: Weighted Average Yield	1.26%	4.05%
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	4,980	0
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	140,575	137,090
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	45,132	49,704
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	0	0
Carrying value: Total Amortized Cost	190,687	186,794
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	5,777	6,192
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	261	621
Carrying value: Fair Value	196,203	192,365
Carrying value: Weighted Average Yield	2.69%	3.13%
Debt securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value: Maturity, 1 Year or Less	14,927	11,476
Fair value: Maturity, 1-5 Years	233,338	251,558
Fair value: Maturity, 5-10 Years	250,860	275,251
Fair value: Maturity, After 10 Years	1,111,177	1,504,420
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	0	0
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	0	0
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	0	0
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	1,500	1,000
Carrying value: Total Amortized Cost	1,500	1,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	0	22
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	57	0
Carrying value: Fair Value	1,443	1,022
Carrying value: Weighted Average Yield	2.17%	2.54%
Fair Value: Maturity, 1 Year or Less	0	0
Fair value: Maturity, 1-5 Years	0	0
Fair value: Maturity, 5-10 Years	0	0
Fair value: Maturity, After 10 Years	$ 1,443	$ 1,022