BORROWINGS (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 262,451		$ 181,467
Federal Home Loan Bank Borrowings [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	108,324		39,610
Wholesale Repurchase Agreements [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	50,000	[1]	50,000	[1]
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	51,547	[2]	51,547	[2]
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	10,310	[3]	10,310	[3]
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	5,258	[4]	0	[4]
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.44%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	7,012	[5]	0	[5]
Fixed rate	7.015%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 30,000	[5]	$ 30,000	[5]
Federal Funds Purchased [Member]
Debt Instrument [Line Items]
Assets sold under repurchase agreements fixed rate	2.29%
Single issuer trust preferred securities issued by banks [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Fixed rate	6.52%
Single issuer trust preferred securities issued by banks [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Single issuer trust preferred securities issued by banks [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.79%
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Debt Instrument [Line Items]
Fixed rate	7.02%
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%

[1] Assets sold under wholesale repurchase agreements were at a fixed rate of 2.29%.

[2] The Capital Trust V Trust Preferred Securities were issued in connection with the issuance of variable rate (LIBOR plus 1.48%) capital securities due in 2037, which are callable quarterly until maturity. The interest rate has been locked at a fixed rate of 6.52%, until December 28, 2016, through the use of an interest rate swap. The Company unconditionally guarantees all obligations under these trust preferred securities.

[3] The Slades Ferry Trust I Preferred Securities were issued in connection with the issuance of variable rate (LIBOR plus 2.79%) capital securities due in 2034, which are callable quarterly until maturity. The Company unconditionally guarantees all obligations under these trust preferred securities.

[4] Central Bancorp Capital Trust I issued trust preferred securities in connection with the issuance of variable rate (LIBOR plus 2.44%) capital securities due in 2034, which are callable quarterly until maturity. The Company unconditionally guarantees all obligations under these trust preferred securities.

[5] The subordinated debentures were issued to USB Capital Resources, Inc., a wholly-owned subsidiary of U.S. Bank National Association. The subordinated debt matures on October1, 2019, however with regulatory approval, the Bank may redeem the subordinated debt without penalty at any time on or after October 1, 2014. The interest rate is fixed at 7.02% until August 27, 2013, at which time it will have a floating rate of LIBOR plus 3.00%.