FAIR VALUE MEASUREMENTS (Details 5) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financial Assets:
Interest-earning deposits in financial institutions	$ 112,590,000	$ 75,393,000
Loans and leases, net	4,329,043,000	3,498,329,000	3,381,179,000
Non-PCI Loans
Financial Assets:
Loans and leases, net	3,862,051,000	3,006,513,000
Impaired loans (excluding PCI loans)
Nonaccrual loans	51,700,000	41,800,000
Amount of nonaccrual loans written down to fair values through chargeoffs	4,700,000
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 | 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	106,237,000	89,011,000
Interest-earning deposits in financial institutions	112,590,000	75,393,000
Securities available-for-sale	1,473,578,000	1,355,385,000
Investment in FHLB stock	39,129,000	37,126,000
Loans and leases, net	4,355,996,000	3,551,674,000
SBA loan servicing asset	903,000	1,000,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,700,887,000	3,888,794,000
Time deposits	824,353,000	823,912,000
Borrowings	9,697,000	12,611,000
Subordinated debentures	132,223,000	108,186,000
Level 1
Financial Assets:
Cash and due from banks	106,237,000	89,011,000
Interest-earning deposits in financial institutions	112,590,000	75,393,000
Securities available-for-sale	516,000	8,985,000
Level 2
Financial Assets:
Securities available-for-sale	1,432,145,000	1,301,716,000
Investment in FHLB stock	39,129,000	37,126,000
Loans and leases, net	5,933,000	4,975,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,700,887,000	3,888,794,000
Time deposits	824,353,000	823,912,000
Borrowings	9,697,000	12,611,000
Subordinated debentures	132,223,000	108,186,000
Level 3
Financial Assets:
Securities available-for-sale	40,917,000	44,684,000
Loans and leases, net	4,350,063,000	3,546,699,000
SBA loan servicing asset	903,000	1,000,000
Carrying or Contract Amount
Financial Assets:
Cash and due from banks	106,237,000	89,011,000
Interest-earning deposits in financial institutions	112,590,000	75,393,000
Securities available-for-sale	1,473,578,000	1,355,385,000
Investment in FHLB stock	39,129,000	37,126,000
Loans and leases, net	4,329,043,000	3,498,329,000
SBA loan servicing asset	903,000	1,000,000
Financial Liabilities:
Demand, money market, interest checking and savings deposits	4,700,887,000	3,888,794,000
Time deposits	822,113,000	820,327,000
Borrowings	9,696,000	12,591,000
Subordinated debentures	$ 132,358,000	$ 108,250,000