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ACQUISITION - Consideration Paid and Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 13, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Goodwill |  | $ 100,255 |  | $ 4,935 |  |  |
Loans |  | 2,376,647 |  | 1,129,064 |  |  |
Fair value adjustment accretable yield |  | 4,567 | $ 3,194 | $ 0 | $ 0 | $ 0 | $ 0
Lake Sunapee |  |  |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |
Bar Harbor Bankshares common stock issued to Lake Sunapee Bank Group stockholders (4,163,853 shares) |  | 181,919 |  |  |  |  |
Cash paid for fractional shares |  | 27 |  |  |  |  |
Total consideration paid | $ 181,920 | 181,946 |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Cash and short-term investments |  | 39,564 |  |  |  |  |
Investment securities |  | 155,579 |  |  |  |  |
Loans |  | 1,208,199 |  |  |  |  |
Premises and equipment |  | 22,210 |  |  |  |  |
Core deposit intangible |  | 7,786 |  |  |  |  |
Other assets |  | 51,879 |  |  |  |  |
Deposits |  | (1,150,611) |  |  |  |  |
Borrowings |  | (232,277) |  |  |  |  |
Deferred taxes, net |  | 8,296 |  |  |  |  |
Other liabilities |  | (24,011) |  |  |  |  |
Total identifiable net assets |  | 86,614 |  |  |  |  |
Goodwill |  | 95,332 |  |  |  |  |
Loans |  | 1,200,000 |  |  |  |  |
Loans receivable, fair value disclosure |  | 1,188,000 |  |  |  |  |
Fair value adjustment accretable yield |  | $ 1,090 |  |  |  |  |
Fair value discount, amortization period (in years) |  | 3 years |  |  |  |  |
Loans and leases receivable, deferred income |  | $ 11,400 |  |  |  |  |
Deposits acquired, amortization period |  | 1 year |  |  |  |  |
Borrowings acquired, weighted average contractual life |  | 4 years |  |  |  |  |
Common stock issued to acquiree (in shares) | 4,163,853 |  |  |  |  |  |
Lake Sunapee | Core Deposits |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Acquired intangible assets, weighted average useful life |  | 12 years |  |  |  |  |
Lake Sunapee | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Loans |  | $ 23,340 |  |  |  |  |
Loans receivable, fair value disclosure |  | 18,450 |  |  |  |  |
Lake Sunapee | As Acquired |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Cash and short-term investments | $ 40,970 |  |  |  |  |  |
Investment securities | 156,960 |  |  |  |  |  |
Loans | 1,217,928 |  |  |  |  |  |
Premises and equipment | 22,561 |  |  |  |  |  |
Core deposit intangible | 0 |  |  |  |  |  |
Other assets | 102,300 |  |  |  |  |  |
Deposits | (1,149,865) |  |  |  |  |  |
Borrowings | (232,261) |  |  |  |  |  |
Deferred taxes, net | (1,921) |  |  |  |  |  |
Other liabilities | (19,924) |  |  |  |  |  |
Total identifiable net assets | $ 136,748 |  |  |  |  |  |
Lake Sunapee | Fair Value Adjustments |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value: |  |  |  |  |  |  |
Cash and short-term investments |  | (1,406) |  |  |  |  |
Investment securities |  | (1,381) |  |  |  |  |
Loans |  | (9,728) |  |  |  |  |
Premises and equipment |  | (351) |  |  |  |  |
Core deposit intangible |  | 7,786 |  |  |  |  |
Other assets |  | (50,419) |  |  |  |  |
Deposits |  | (746) |  |  |  |  |
Borrowings |  | (16) |  |  |  |  |
Deferred taxes, net |  | 10,217 |  |  |  |  |
Other liabilities |  | (4,087) |  |  |  |  |
Total identifiable net assets |  | $ (50,131) |  |  |  |  |

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