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ACQUISITION - Narrative (Details) $ / shares in Units, shares in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 13, 2017 USD ($) banking_office subsidiary $ / shares shares | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Pro forma estimated tax rate |  | 37.57% |
Lake Sunapee |  |  |
Business Acquisition [Line Items] |  |  |
Number of subsidiaries | subsidiary | 1 |  |
Number of full service branches acquired | banking_office | 33 |  |
Common shares outstanding | shares | 8,380 |  |
Shares issued/exchanged in acquisition | shares | 4,164 |  |
Fixed exchange ratio | 0.4970 |  |
Acquired price per share (in dollars per share) | $ / shares | $ 43.69 |  |
Total consideration paid | $ 181,900,000 | $ 181,946,000 |
Cash paid for fractional shares | $ 27,000 |  |
Acquisition integration related costs |  | $ 3,100,000 | $ 0

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