LOANS AND LEASES - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased impaired loans, carrying balance	$ 207,795,000		$ 207,795,000			$ 264,904,000
Purchased impaired loans	236,500,000		236,500,000			314,500,000
Reclassification from/(to) non-accretable difference	76,000	$ (2,295,000)	(2,048,000)	$ 19,864,000
Restructured Loans, Nonaccrual Status	13,600,000		13,600,000			12,300,000
Total loans	117,600,000		117,600,000			135,700,000
Write-downs	237,000	1,678,000	1,204,000	3,854,000
Gain (loss) on sale of other real estate owned	(196,000)	589,000	(1,089,000)	(573,000)
Real Estate Acquired Through Foreclosure	15,187,000	22,496,000	$ 15,187,000	22,496,000	$ 16,401,000	$ 22,674,000	$ 32,809,000	$ 46,926,000
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Federal Deposit Insurance Corporation Reimbursement Percentage on Losses Below Threshold			80.00%
Loans, Federal Deposit Insurance Corporation Reimbursement Percentage on Losses Above Threshold			95.00%
Real Estate Acquired Through Foreclosure	1,400,000	11,200,000	$ 1,400,000	11,200,000
Commercial | Non Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			250,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Write-downs	$ 54,000	$ 188,000	241,000	$ 358,000
Residential | Non Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			$ 100,000