INVESTMENTS IN DEBT AND EQUITY SECURITIES (Schedule of Continuous Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 97,011	$ 566,896
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(606)	(19,441)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	322,208	10,253
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	(9,437)	(315)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	419,219	577,149
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(10,043)	(19,756)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	80,657	661,612
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(1,018)	(20,999)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	378,394	10,527
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(8,990)	(447)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	459,051	672,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(10,008)	(21,446)
U.S. Government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	16,005
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	0	(664)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	14,670	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	(52)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,670	16,005
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(52)	(664)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	12,855	15,966
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(104)	(153)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 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	12,855	15,966
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(104)	(153)
Residential mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	85,433	511,617
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(434)	(18,119)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	264,814	5,473
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	(8,707)	(95)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	350,247	517,090
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(9,141)	(18,214)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	67,802	644,700
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(914)	(20,759)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	377,479	10,527
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(8,903)	(447)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	445,281	655,227
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(9,817)	(21,206)
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	27,872
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	0	(560)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	28,038	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	(364)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	28,038	27,872
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(364)	(560)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	946
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	(87)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	915	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(87)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	915	946
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(87)	(87)
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	9,873	9,959
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(127)	(41)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	14,686	4,780
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	(314)	(220)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	24,559	14,739
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	(441)	(261)
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	1,705	1,443
Available-for-sale Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(45)	(57)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,705	1,443
Available-for-sale Securities, Continuous Unrealized Loss Position Aggregate Losses	$ (45)	$ (57)