INCOME TAXES - Significant Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforward	$ 35,955	$ 32,638
Recognized built-in loss carryforward	5,899	5,899
Acquisition accounting fair value adjustments	0	4,998
Allowance for loan losses	5,169	3,673
Federal tax credits carryforward	7,960	4,112
Unrealized losses on securities	6,120	2,055
Unrealized losses on cash flow hedges	2,272	2,596
Stock-based compensation	2,778	1,997
Capitalized leases	1,057	1,110
Deferred compensation	4,606	1,831
Other	1,524	0
Total deferred tax assets	73,340	60,909
Valuation allowance	(763)	(1,059)
Net deferred tax assets	72,577	59,850
Deferred tax liabilities:
Premises and equipment	6,643	3,262
Prepaid expenses	469	680
Deferred loan origination costs	4,429	0
Purchase accounting fair value adjustments	2,807	0
Other	0	301
Total deferred tax liabilities	14,348	4,243
Net deferred tax asset	$ 58,229	$ 55,607