BORROWINGS (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Wholesale Repurchase Agreements	$ 0	$ 50,000
Total Long-Term Borrowings	108,464	188,685
Subordinated Debt	35,000	65,000
Wholesale Repurchase Agreements [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings		50,000
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	51,547	51,547
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	10,310	10,310
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	5,258	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 6,349	6,570
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings		$ 65,000