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LOANS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) modification | Dec. 31, 2017 USD ($) modification | Dec. 31, 2016 USD ($) modification
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Collateral value of pledged loans to Federal Reserve Bank of Boston | $ 96,300 |  |
Collateral value of pledged loans for FHLB borrowings | 986,200 |  |
Loans | $ 2,490,227 | $ 2,485,613 |
Borrower's sustained repayment performance period | 6 months |  |
Modifications that subsequently defaulted, number of contracts | modification | 0 | 0 | 0
Loan portfolio | $ 2,490,227 | $ 2,485,613 |
Servicing loans for participants | 496,500 | 497,900 |
Contractually specified servicing fees | 1,300 | 1,200 | $ 28
Residential real estate: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Foreclosed property | 2,400 | 90 |
Loan portfolio | 1,144,698 | 1,155,682 |
Total loans held for sale | 168 | 13,400 |
Net gains on sales of loans | 121 | 222 |
Residential real estate: | Mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Process of foreclosure | 1,500 | 843 |
Acquired Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 859,330 | 1,032,983 |
Acquired credit impaired | 10,100 |  |
Certain loans acquired in transfer not accounted for as debt securities, note balance, net | 14,000 |  |
Financing receivable not considered impaired at time of acquisition | 849,200 |  |
Loan portfolio | 859,330 | 1,032,983 |
Acquired Loans | Residential real estate: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 474,509 | 564,271 |
Loan portfolio | 474,509 | 564,271 |
Product Line | Loan concentration | Lodging industry |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan portfolio | $ 223,000 | $ 234,600 |
Percentage of loan portfolio | 9.00% | 9.40% |

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- Definition Pledged Assets Separately Reported, Loans Pledged for Federal Reserve Bank, at Fair Value + References No definition available. + Details
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- Definition Represents the reasonable period of a borrower's sustained repayment performance for consideration of returning the loan to performing status. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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