Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (11,761)	$ 9,439	$ 11,017
Unrealized losses on securities available-for-sale:
Unrealized holding losses arising during the year	(503)	(3,307)	(2,369)
Less: reclassification adjustment for net gains on sales of securities available-for-sale	(347)	(20)	(1,243)
Net change in unrealized losses on securities available-for-sale	(850)	(3,327)	(3,612)
Unrealized gain on derivative instruments designated as cash flow hedges:
Unrealized holdings gains on derivatives arising during the period	106	989	0
Less: reclassification adjustment for gains on derivative instruments	(17)	0	0
Net change in unrealized gain on derivative instruments	89	989	0
Total other comprehensive loss, before tax	(761)	(2,338)	(3,612)
Income tax effect related to items of other comprehensive loss	267	819	1,264
Total other comprehensive loss, net of tax	(494)	(1,519)	(2,348)
Total comprehensive (loss) income	$ (12,255)	$ 7,920	$ 8,669