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ACQUISITIONS - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 10, 2015 | Mar. 27, 2015
--- | --- | --- | --- | --- | ---
Liabilities [Abstract] |  |  |  |  |
Goodwill | $ 18,742 | $ 18,742 | $ 18,601 |  |
DCB |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash |  |  |  |  | $ 5,794
Investment securities available for sale |  |  |  |  | 2,862
Loans, net of discount of $1,389 and $468, respectively |  |  |  |  | 118,154
Loans and leases receivable, discount |  |  |  |  | 1,389
Accrued interest receivable |  |  |  |  | 299
Premises and equipment |  |  |  |  | 199
Nonmarketable equity securities |  |  |  |  | 168
Core deposit intangible |  |  |  |  | 968
Other assets |  |  |  |  | 1,726
Total assets acquired |  |  |  |  | 130,170
Liabilities [Abstract] |  |  |  |  |
Other liabilities |  |  |  |  | 9,553
Total liabilities assumed |  |  |  |  | 109,159
Net assets acquired (liabilities assumed) |  |  |  |  | 21,011
Total consideration paid |  |  |  |  | 29,681
Goodwill | 8,670 |  |  |  | 8,670
TLB |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash |  |  |  | $ 8,124 |
Investment securities available for sale |  |  |  | 19,794 |
Loans, net of discount of $1,389 and $468, respectively |  |  |  | 43,568 |
Loans and leases receivable, discount |  |  |  | 468 |
Accrued interest receivable |  |  |  | 173 |
Premises and equipment |  |  |  | 2,664 |
Nonmarketable equity securities |  |  |  | 0 |
Core deposit intangible |  |  |  | 534 |
Other assets |  |  |  | 1,558 |
Total assets acquired |  |  |  | 76,415 |
Liabilities [Abstract] |  |  |  |  |
Other liabilities |  |  |  | 519 |
Total liabilities assumed |  |  |  | 66,015 |
Net assets acquired (liabilities assumed) |  |  |  | 10,400 |
Total consideration paid |  |  |  | 14,215 |
Goodwill | $ 3,815 |  |  | 3,815 |
Noninterest-bearing deposits | DCB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  |  | 25,607
Noninterest-bearing deposits | TLB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  | 16,702 |
Interest-bearing deposits | DCB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  |  | 68,844
Interest-bearing deposits | TLB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  | 48,794 |
Subordinated debentures | DCB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  |  | $ 5,155
Subordinated debentures | TLB |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Financial liabilities |  |  |  | $ 0 |

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