LOANS AND LEASES - Restructured Loans (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) loans d	Mar. 31, 2015 USD ($) loans	Dec. 31, 2015 USD ($) loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reclassification from/(to) non-accretable difference	$ 318,000	$ (1,576,000)
Extended Maturities	486,000	9,481,000
Adjusted Interest Rates	0	0
Combined Rate And Maturity	162,000	62,000
Forebearance Agreements	0	0
Other	1,883,000	159,000
Total	$ 2,531,000	$ 9,702,000
Restructured loans, Number of Loans | loans	17	14
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 2,562,000	$ 13,274,000
Restructured loans, Period End Balance	$ 2,531,000	$ 9,702,000
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	4	4
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 301,000	$ 1,040,000
Number of Restructured Loans | loans	271		271
Total restructured loans	$ 37,700,000		$ 38,200,000
Restructured loans on accrual status	30,127,000		28,876,000
Restructured Loans, Nonaccrual Status	7,500,000		9,300,000
Loans and Leases Receivable, Impaired, Commitment to Lend	400,000		1,800,000
Allowance for loan and lease losses lncluded in reserves for restructured loans	2,400,000		6,300,000
Restructured loans uncollectible portion written off	200,000	$ 0	2,700,000
Accruing TDRs performing in accordance with restructured terms for more than one year	$ 10,200,000		$ 10,300,000
Restructured loans performance threshold (days) | d	90
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	8	8
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 2,083,000	$ 360,000
Restructured loans, Period End Balance	$ 2,095,000	$ 359,000
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	1	0
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 55,000	$ 0
Real estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	0	0
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 0	$ 0
Real estate - commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	1	6
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 42,000	$ 12,914,000
Restructured loans, Period End Balance	$ 42,000	$ 9,343,000
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	0	3
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 0	$ 967,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	2	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 281,000	$ 0
Restructured loans, Period End Balance	$ 247,000	$ 0
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	1	1
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 214,000	$ 73,000
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	2	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 7,000	$ 0
Restructured loans, Period End Balance	$ 7,000	$ 0
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	1	0
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 4,000	$ 0
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	4	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 149,000	$ 0
Restructured loans, Period End Balance	$ 140,000	$ 0
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	1	0
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 28,000	$ 0
Non Covered Loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	$ 100,000