INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	$ 1,022	$ 826
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	1,019	1,099
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	230,655	161,254
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	567,757	468,374
Held-to-maturity Securities, Amortized Cost Before Other Than Temporary Impairment	800,453	631,553
Held-to-maturity Securities, Unrecognized Holding Gain	570	6,462
Held-to-maturity Securities, Unrecognized Holding Loss	(13,232)	(991)
Held-to-maturity Securities, Fair Value	787,791	637,024
Held-to-maturity Securities Weighted Average Yield	1.80%	1.80%
Held-to-maturity Securities Weighted Average Yield With In One Year	2.91%	2.56%
Held-to-maturity Securities Weighted Average Yield After One Through Five Years	3.28%	3.40%
Held-to-maturity Securities Weighted Average Yield After Five Through Ten Years	1.60%	1.77%
Held-to-maturity Securities Weighted Average Yield After Ten Years	1.87%	1.81%
U.S. Government sponsored agencies [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	22,717	52,582
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Amortized Cost Before Other Than Temporary Impairment	22,717	52,582
Held-to-maturity Securities, Unrecognized Holding Gain	0	269
Held-to-maturity Securities, Unrecognized Holding Loss	(59)	0
Held-to-maturity Securities, Fair Value	22,658	52,851
Held-to-maturity Securities Weighted Average Yield	1.41%	1.63%
Residential mortgage-backed [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	207,883	108,420
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	566,691	466,863
Held-to-maturity Securities, Amortized Cost Before Other Than Temporary Impairment	774,574	575,283
Held-to-maturity Securities, Unrecognized Holding Gain	554	6,142
Held-to-maturity Securities, Unrecognized Holding Loss	(13,147)	(614)
Held-to-maturity Securities, Fair Value	761,981	580,811
Held-to-maturity Securities Weighted Average Yield	1.81%	1.82%
States and political subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Within One Year, Net Carrying Amount	1,022	826
Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount	1,019	1,099
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount	55	252
Held-to-maturity Securities, Debt Maturities, After Ten Years, Net Carrying Amount	1,066	1,511
Held-to-maturity Securities, Amortized Cost Before Other Than Temporary Impairment	3,162	3,688
Held-to-maturity Securities, Unrecognized Holding Gain	16	51
Held-to-maturity Securities, Unrecognized Holding Loss	(26)	(377)
Held-to-maturity Securities, Fair Value	3,152	3,362
Held-to-maturity Securities Weighted Average Yield	2.08%	1.89%
Debt securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	1,032	836
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	1,024	1,129
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	227,321	164,433
Held-to-maturity Securities, Debt Maturities, After Ten Years, Fair Value	$ 558,414	$ 470,626