INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 109,011	$ 145,467
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(2,749)	(587)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	15,425	17,945
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer Aggregate Losses	(174)	(677)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	124,436	163,412
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(2,923)	(1,264)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	217,426	67,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(620)	(991)
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, Aggregate Losses	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	217,426	67,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(620)	(991)
U.S. Government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	46,855	20,018
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(2,157)	(146)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	46,855	20,018
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(2,157)	(146)
Residential mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	49,531	125,449
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(315)	(441)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,418	270
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer Aggregate Losses	(77)	(56)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	54,949	125,719
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(392)	(497)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	217,426	66,011
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(620)	(614)
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, Aggregate Losses	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	217,426	66,011
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(620)	(614)
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,625	0
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(277)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,007	17,675
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer Aggregate Losses	(97)	(621)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	22,632	17,675
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(374)	(621)
States and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		1,133
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(377)
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, Aggregate Losses		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		1,133
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		$ (377)