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			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Non Covered Loans	Dec. 31, 2013 Non Covered Loans	Mar. 31, 2014 Commercial Non Covered Loans	Dec. 31, 2013 Commercial Non Covered Loans	Mar. 31, 2014 Real estate-construction Non Covered Loans	Dec. 31, 2013 Real estate-construction Non Covered Loans	Mar. 31, 2014 Real estate-commercial Non Covered Loans	Dec. 31, 2013 Real estate-commercial Non Covered Loans	Mar. 31, 2014 Real estate-residential Non Covered Loans	Dec. 31, 2013 Real estate-residential Non Covered Loans	Mar. 31, 2014 Installment Non Covered Loans	Dec. 31, 2013 Installment Non Covered Loans	Mar. 31, 2014 Home equity Non Covered Loans	Dec. 31, 2013 Home equity Non Covered Loans	Mar. 31, 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	$ 43,829	$ 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	1,159	3,041		1,159	8,714	349	5,385	(11)	(3,115)	289	2,659	137	593	(11)	(132)	421	1,937	(15)	1,387
Gross charge-offs	2,424	3,210		2,424	17,283	656	3,415	0	1	543	8,326	257	1,016	128	335	544	2,409	296	1,781
Recoveries	459	698		459	4,621	39	672	0	672	114	1,994	27	203	77	310	103	508	99	262
Total net charge-offs				1,965	12,662	617	2,743	0	(671)	429	6,332	230	813	51	25	441	1,901	197	1,519
Balance at end of period	43,023	48,306		43,023	43,829	10,300	10,568	813	824	20,338	20,478	3,286	3,379	303	365	5,189	5,209	2,794	3,006
Ending allowance on loans individually evaluated for impairment				4,553	5,302	1,383	2,080	0	0	2,800	2,872	368	348	0	0	2	2	0	0
Ending allowance on loans collectively evaluated for impairment				38,470	38,527	8,917	8,488	813	824	17,538	17,606	2,918	3,031	303	365	5,187	5,207	2,794	3,006
Loans and Leases:
Ending balance of loans individually evaluated for impairment				29,909	32,677	9,159	10,391	0	0	16,387	18,023	3,604	3,493	114	122	645	648	0	0
Ending balance of loans collectively evaluated for impairment				3,584,294	3,472,964	1,108,898	1,025,277	87,996	80,741	1,497,504	1,478,964	357,067	349,438	44,797	47,011	373,782	375,806	114,250	115,727
Loans and Leases Receivable, Net of Deferred Income	$ 3,614,203		$ 3,505,641	$ 3,614,203	$ 3,505,641	$ 1,118,057	$ 1,035,668	$ 87,996	$ 80,741	$ 1,513,891	$ 1,496,987	$ 360,671	$ 352,931	$ 44,911	$ 47,133	$ 374,427	$ 376,454	$ 114,250	$ 115,727