ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Non Covered Loans	Dec. 31, 2012 Non Covered Loans	Sep. 30, 2013 Commercial Non Covered Loans	Dec. 31, 2012 Commercial Non Covered Loans	Sep. 30, 2013 Real estate-construction Non Covered Loans	Dec. 31, 2012 Real estate-construction Non Covered Loans	Sep. 30, 2013 Real estate-commercial Non Covered Loans	Dec. 31, 2012 Real estate-commercial Non Covered Loans	Sep. 30, 2013 Real estate-residential Non Covered Loans	Dec. 31, 2012 Real estate-residential Non Covered Loans	Sep. 30, 2013 Installment Non Covered Loans	Dec. 31, 2012 Installment Non Covered Loans	Sep. 30, 2013 Home equity Non Covered Loans	Dec. 31, 2012 Home equity Non Covered Loans	Sep. 30, 2013 All other Non Covered Loans	Dec. 31, 2012 All other Non Covered Loans
Allowance for loan and lease losses:
Balance at beginning of period	$ 47,047	$ 50,952	$ 47,777	$ 52,576		$ 47,777	$ 52,576	$ 7,926	$ 10,289	$ 3,268	$ 4,424	$ 24,151	$ 18,228	$ 3,599	$ 4,994	$ 522	$ 1,659	$ 5,173	$ 10,751	$ 3,138	$ 2,231
Provision for loan and lease losses	1,413	3,613	6,863	15,235		6,863	19,117	3,675	1,556	(3,166)	1,528	3,691	16,670	260	346	(105)	(883)	1,707	(2,032)	801	1,932
Gross charge-offs	5,111	5,804	12,515	19,764		12,515	25,312	3,122	4,312	0	2,684	5,213	11,012	798	1,814	296	577	1,703	3,661	1,383	1,252
Recoveries	2,165	431	3,389	1,145		3,389	1,396	478	393	626	0	1,360	265	107	73	244	323	372	115	202	227
Total net charge-offs						9,126	23,916	2,644	3,919	(626)	2,684	3,853	10,747	691	1,741	52	254	1,331	3,546	1,181	1,025
Balance at end of period	45,514	49,192	45,514	49,192		45,514	47,777	8,957	7,926	728	3,268	23,989	24,151	3,168	3,599	365	522	5,549	5,173	2,758	3,138
Ending allowance on loans individually evaluated for impairment						8,366	9,528	1,645	1,151	0	838	6,371	7,155	348	290	0	0	2	2	0	92
Ending allowance on loans collectively evaluated for impairment						37,148	38,249	7,312	6,775	728	2,430	17,618	16,996	2,820	3,309	365	522	5,547	5,171	2,758	3,046
Loans and Leases:
Ending balance of loans individually evaluated for impairment						53,603	57,360	10,203	16,661	1,099	2,076	38,162	35,422	3,624	2,604	0	0	515	101	0	496
Ending balance of loans collectively evaluated for impairment						3,377,313	3,121,704	949,813	844,372	88,990	71,441	1,455,807	1,381,586	349,206	315,606	49,273	56,810	373,324	367,399	110,900	84,490
Loans and Leases Receivable, Net of Deferred Income	$ 3,430,916		$ 3,430,916		$ 3,179,064	$ 3,430,916	$ 3,179,064	$ 960,016	$ 861,033	$ 90,089	$ 73,517	$ 1,493,969	$ 1,417,008	$ 352,830	$ 318,210	$ 49,273	$ 56,810	$ 373,839	$ 367,500	$ 110,900	$ 84,986