INVESTMENTS IN DEBT AND EQUITY SECURITIES (Schedule of Continuous Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available for sale: Less than 12 months, Fair Value	$ 566,896	$ 145,467
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(19,441)	(587)
Available for sale: 12 months or more, Fair Value	10,253	17,945
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	(315)	(677)
Available for sale: Total, Fair Value	577,149	163,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	(19,756)	(1,264)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	661,612	67,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(20,999)	(991)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,527	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(447)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	672,139	67,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(21,446)	(991)
US Government sponsored agencies [Member]
Available for sale: Less than 12 months, Fair Value	16,005	20,018
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(664)	(146)
Available for sale: 12 months or more, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	0	0
Available for sale: Total, Fair Value	16,005	20,018
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	(664)	(146)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15,966
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(153)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	15,966
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(153)
Residential mortgage-backed [Member]
Available for sale: Less than 12 months, Fair Value	511,617	125,449
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(18,119)	(441)
Available for sale: 12 months or more, Fair Value	5,473	270
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	(95)	(56)
Available for sale: Total, Fair Value	517,090	125,719
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	(18,214)	(497)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	644,700	66,011
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(20,759)	(614)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,527	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(447)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	655,227	66,011
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(21,206)	(614)
State and political subdivisions
Available for sale: Less than 12 months, Fair Value	27,872
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(560)
Available for sale: 12 months or more, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	0
Available for sale: Total, Fair Value	27,872
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	(560)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	946	1,133
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(87)	(377)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	946	1,133
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(87)	(377)
Corporate notes
Available for sale: Less than 12 months, Fair Value	9,959	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(41)	0
Available for sale: 12 months or more, Fair Value	4,780	17,675
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	(220)	(621)
Available for sale: Total, Fair Value	14,739	17,675
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	(261)	(621)
Equity securities
Available for sale: Less than 12 months, Fair Value	1,443
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments	(57)
Available for sale: 12 months or more, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments	0
Available for sale: Total, Fair Value	1,443
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments	$ (57)