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		6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Non Covered Loans	Dec. 31, 2013 Non Covered Loans	Jun. 30, 2014 Commercial Non Covered Loans	Dec. 31, 2013 Commercial Non Covered Loans	Jun. 30, 2014 Real estate-construction Non Covered Loans	Dec. 31, 2013 Real estate-construction Non Covered Loans	Jun. 30, 2014 Real estate-commercial Non Covered Loans	Dec. 31, 2013 Real estate-commercial Non Covered Loans	Jun. 30, 2014 Real estate-residential Non Covered Loans	Dec. 31, 2013 Real estate-residential Non Covered Loans	Jun. 30, 2014 Installment Non Covered Loans	Dec. 31, 2013 Installment Non Covered Loans	Jun. 30, 2014 Home equity Non Covered Loans	Dec. 31, 2013 Home equity Non Covered Loans	Jun. 30, 2014 All other Non Covered Loans	Dec. 31, 2013 All other Non Covered Loans
Allowance for loan and lease losses:
Balance at beginning of period	$ 43,023	$ 48,306	$ 43,829	$ 47,777		$ 43,829	$ 47,777	$ 10,568	$ 7,926	$ 824	$ 3,268	$ 20,478	$ 24,151	$ 3,379	$ 3,599	$ 365	$ 522	$ 5,209	$ 5,173	$ 3,006	$ 3,138
Provision for loan and lease losses	29	2,409	1,188	5,450		1,188	8,714	(253)	5,385	53	(3,115)	1,200	2,659	104	593	(138)	(132)	299	1,937	(77)	1,387
Gross charge-offs	2,187	4,194	4,611	7,404		4,611	17,283	1,227	3,415	0	1	1,242	8,326	540	1,016	142	335	927	2,409	533	1,781
Recoveries	1,162	526	1,621	1,224		1,621	4,621	619	672	0	672	448	1,994	127	203	127	310	140	508	160	262
Total net charge-offs						2,990	12,662	608	2,743	0	(671)	794	6,332	413	813	15	25	787	1,901	373	1,519
Balance at end of period	42,027	47,047	42,027	47,047		42,027	43,829	9,707	10,568	877	824	20,884	20,478	3,070	3,379	212	365	4,721	5,209	2,556	3,006
Ending allowance on loans individually evaluated for impairment						3,236	5,302	775	2,080	0	0	2,091	2,872	368	348	0	0	2	2	0	0
Ending allowance on loans collectively evaluated for impairment						38,791	38,527	8,932	8,488	877	824	18,793	17,606	2,702	3,031	212	365	4,719	5,207	2,556	3,006
Loans and Leases:
Ending balance of loans individually evaluated for impairment						26,782	32,677	8,749	10,391	0	0	13,925	18,023	3,230	3,493	110	122	768	648	0	0
Ending balance of loans collectively evaluated for impairment						3,635,877	3,472,964	1,134,944	1,025,277	113,682	80,741	1,477,806	1,478,964	369,371	349,438	43,228	47,011	379,978	375,806	116,868	115,727
Loans and Leases Receivable, Net of Deferred Income	$ 3,662,659		$ 3,662,659		$ 3,505,641	$ 3,662,659	$ 3,505,641	$ 1,143,693	$ 1,035,668	$ 113,682	$ 80,741	$ 1,491,731	$ 1,496,987	$ 372,601	$ 352,931	$ 43,338	$ 47,133	$ 380,746	$ 376,454	$ 116,868	$ 115,727