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BORROWINGS (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated Debt | $ 34,682,000 |  |  |  | $ 34,635,000 |  |  |  | $ 34,682,000 | $ 34,635,000 |
Interest Expense, Long-term Debt |  |  |  |  |  |  |  |  | 4,000,000 | 5,800,000 | $ 6,600,000
Gains (Losses) on Extinguishment of Debt | 0 | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ (437,000) | 0 | (437,000) | (122,000)
Loans Pledged as Collateral | $ 1,500,000,000 |  |  |  | $ 1,400,000,000 |  |  |  | $ 1,500,000,000 | $ 1,400,000,000 |
Federal Home Loan Bank Advances Weighted Average Interest Rate inclusive of Swaps | 2.47% |  |  |  | 3.42% |  |  |  | 2.47% | 3.42% |
Repayments of Debt |  |  |  |  |  |  |  |  |  | $ 49,000,000 | 13,000,000
Securities Sold under Agreements to Repurchase | $ 162,679,000 |  |  |  | $ 176,913,000 |  |  |  | $ 162,679,000 | 176,913,000 |
Interest expense on short-term borrowings |  |  |  |  |  |  |  |  | 257,000 | 208,000 | $ 210,000
Total Long-Term Borrowings | 107,755,000 |  |  |  | 107,742,000 |  |  |  | 107,755,000 | 107,742,000 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated Debt | 35,000,000 |  |  |  | 35,000,000 |  |  |  | 35,000,000 | 35,000,000 |
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Borrowings | $ 51,503,000 |  |  |  | $ 51,500,000 |  |  |  | $ 51,503,000 | $ 51,500,000 |
Fixed rate | 3.07% |  |  |  |  |  |  |  | 3.07% |  |
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired | 2.84% |  |  |  | 6.52% |  |  |  | 2.84% | 6.52% |
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - forward starting | 2.84% |  |  |  |  |  |  |  | 2.84% |  |
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.48% |  |
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 4.75% |  |  |  |  |  |  |  | 4.75% |  |
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 2.98% |  |
Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Borrowings | $ 10,229,000 |  |  |  | $ 10,224,000 |  |  |  | $ 10,229,000 | $ 10,224,000 |
Fixed rate | 4.39% |  |  |  |  |  |  |  | 4.39% |  |
Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 2.79% |  |
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Borrowings | $ 5,258,000 |  |  |  | 5,302,000 |  |  |  | $ 5,258,000 | 5,302,000 |
Fixed rate | 4.03% |  |  |  |  |  |  |  | 4.03% |  |
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 2.44% |  |
Central Bancorp Capital Trust II Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Borrowings | $ 6,083,000 |  |  |  | 6,081,000 |  |  |  | $ 6,083,000 | 6,081,000 |
Fixed rate | 7.015% |  |  |  |  |  |  |  | 7.015% |  |
Central Bancorp Capital Trust II Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 3.24% |  |  |  |  |  |  |  | 3.24% |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.65% |  |
Federal Home Loan Bank Advances [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Federal home loan bank unused remaining available borrowing capacity | $ 954,800,000 |  |  |  | $ 793,100,000 |  |  |  | $ 954,800,000 | $ 793,100,000 |
Line of credit maximum borrowing capacity | $ 5,000,000 |  |  |  |  |  |  |  | $ 5,000,000 |  |

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