FAIR VALUE MEASUREMENTS (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financial Assets:
Interest-earning deposits in financial institutions	$ 50,998,000	$ 75,393,000
Loans and leases, net	4,230,318,000	3,498,329,000
Financial Liabilities:
Time deposits	664,371,000
Other real estate owned
Period of appraisals for Level 2 measurement	12 months
Non-PCI Loans
Financial Assets:
Loans and leases, net	3,869,315,000	3,006,513,000
Impaired loans (excluding PCI loans)
Nonaccrual loans	46,800,000	41,800,000
Amount of nonaccrual loans written down to fair values through charge-offs	2,000,000
Minimum
Impaired loans (excluding PCI loans)
Threshold of unpaid principal balance of non-purchased credit impaired nonaccrual loans for individual evaluation of impairment	250,000
Minimum | Non-PCI Loans
Impaired loans (excluding PCI loans)
Threshold of unpaid principal balance of non-purchased credit impaired nonaccrual loans for individual evaluation of impairment	250,000
Maximum
Impaired loans (excluding PCI loans)
Threshold of unpaid principal balance of non-purchased credit impaired nonaccrual loans for collective evaluation of impairment	250,000
Maximum | Non-PCI Loans
Impaired loans (excluding PCI loans)
Threshold of unpaid principal balance of non-purchased credit impaired nonaccrual loans for collective evaluation of impairment	250,000
Total
Financial Assets:
Cash and due from banks	96,424,000	89,011,000
Interest-earning deposits in financial institutions	50,998,000	75,393,000
Securities available-for-sale	1,494,745,000	1,355,385,000
Investment in FHLB stock	27,939,000	37,126,000
Loans and leases, net	4,231,078,000	3,551,674,000
SBA loan servicing asset	807,000	1,000,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,616,616,000	3,888,794,000
Time deposits	665,148,000	823,912,000
Borrowings	113,726,000	12,611,000
Subordinated debentures	132,498,000	108,186,000
Level 1
Financial Assets:
Cash and due from banks	96,424,000	89,011,000
Interest-earning deposits in financial institutions	50,998,000	75,393,000
Securities available-for-sale	507,000	8,985,000
Financial Liabilities:
Borrowings	106,600,000
Level 2
Financial Assets:
Securities available-for-sale	1,456,334,000	1,301,716,000
Investment in FHLB stock	27,939,000	37,126,000
Loans and leases, net	2,051,000	4,975,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,616,616,000	3,888,794,000
Time deposits	665,148,000	823,912,000
Borrowings	7,126,000	12,611,000
Subordinated debentures	132,498,000	108,186,000
Level 3
Financial Assets:
Securities available-for-sale	37,904,000	44,684,000
Loans and leases, net	4,229,027,000	3,546,699,000
SBA loan servicing asset	807,000	1,000,000
Carrying or Contract Amount
Financial Assets:
Cash and due from banks	96,424,000	89,011,000
Interest-earning deposits in financial institutions	50,998,000	75,393,000
Securities available-for-sale	1,494,745,000	1,355,385,000
Investment in FHLB stock	27,939,000	37,126,000
Loans and leases, net	4,230,318,000	3,498,329,000
SBA loan servicing asset	807,000	1,000,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,616,616,000	3,888,794,000
Time deposits	664,371,000	820,327,000
Borrowings	113,726,000	12,591,000
Subordinated debentures	$ 132,645,000	$ 108,250,000