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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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