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ACQUISITIONS - Summary of the Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 32,160 |  | $ 18,742
Westbound |  |  |
Business Acquisition [Line Items] |  |  |
Cash and due from banks |  | $ 24,927 |
Investment securities available for sale |  | 15,264 |
Loans, net of discount |  | 154,687 |
Accrued interest receivable |  | 651 |
Premises and equipment |  | 8,625 |
Nonmarketable equity securities |  | 0 |
Core deposit intangible |  | 2,700 |
Other assets |  | 9,205 |
Total assets acquired |  | 216,059 |
Accrued interest and other liabilities |  | 1,565 |
Total liabilities assumed |  | 193,486 |
Net assets acquired |  | 22,573 |
Total consideration paid |  | 35,991 |
Goodwill |  | 13,418 |
Westbound | Non-interest bearing deposits |  |  |
Business Acquisition [Line Items] |  |  |
Financial liabilities |  | 40,595 |
Westbound | Interest bearing deposits |  |  |
Business Acquisition [Line Items] |  |  |
Financial liabilities |  | 140,826 |
Westbound | Federal Home Loan Bank advances |  |  |
Business Acquisition [Line Items] |  |  |
Financial liabilities |  | $ 10,500 |

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