INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for credit losses	$ 6,556	$ 9,233
Acquired loan valuation allowance	835	3,493
Net operating loss carryforward	989	1,755
Nonqualified stock options and restricted stock	1,449	1,561
Real estate acquired by foreclosure write-downs	583	1,432
Acquired deposit valuation allowance	273	804
Unrealized loss on available-for-sale securities	2,093	390
Pre-opening expenses	58	120
Non-accrual loan interest	828	809
Other	310	852
Total deferred tax assets	13,974	20,449
Deferred tax liabilities:
Goodwill and core deposit intangibles	2,436	4,337
Acquired subordinated debentures valuation allowance	1,709	2,996
Acquired investments valuation allowance	413	688
Deferred loan costs	476	674
Depreciable assets	83	392
Other	99	96
Total deferred tax liabilities	5,216	9,183
Net deferred tax asset	$ 8,758	$ 11,266