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BORROWINGS (Long-Term Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt | $ 74,906 | $ 0
Total Long-Term Borrowings | 187,355 | 110,901
Subordinated Debt | 49,601 | 34,728
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 51,547 |
Total Long-Term Borrowings | 51,507 | 51,505
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt |  | 10,234
Total Long-Term Borrowings | 0 |
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 5,258 |
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] |  |
Long-term Debt | 6,083 |
Total Long-Term Borrowings | 6,083 | 6,083
Junior Subordinated Debentures [Member] | East Main Street Trust [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 0 | $ 3,093

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