Parent corporation only financial statements (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ 13,513	$ 646	$ (1,037)
Adjustments to reconcile net income (loss) to net cash used in operating activities Writedown on assets held for sale
Writedown on assets held for sale	220	2,649	0
(Increase) decrease in other assets	(2,660)	190	138
Increase (decrease) in other liabilities	(2,257)	505	2,736
Net cash used in operating activities	(1,312)	2,350	(2,252)
Cash Flows from Investing Activities
Net cash used in investing activities	(21,180)	(13,571)	21,832
Cash Flows from Financing Activities
Proceeds from issuance of common stock	0	(79)	(11)
Net proceeds from sale of common stock, net of expenses of $990	0	8,965	0
Net cash provided by (used in) financing activities	14,402	(15,920)	(15,190)
Net increase (decrease) in cash	(5,466)	(31,841)	8,894
Parent Company [Member]
Cash Flows from Operating Activities
Net income (loss)	13,513	646	(1,037)
Adjustments to reconcile net income (loss) to net cash used in operating activities Writedown on assets held for sale
Writedown on assets held for sale	0	1,759	0
Undistributed (income) loss of subsidiary	(11,087)	(3,120)	664
(Increase) decrease in other assets	(2,890)	258	(239)
Increase (decrease) in other liabilities	(1,260)	(19)	247
Net cash used in operating activities	(1,724)	(476)	(365)
Cash Flows from Investing Activities
Investment in subsidiary	0	(5,000)	0
Net cash used in investing activities	0	(5,000)	0
Cash Flows from Financing Activities
Proceeds from issuance of common stock	0	(79)	(11)
Net proceeds from sale of common stock, net of expenses of $990	0	8,965	0
Net cash provided by (used in) financing activities	0	8,886	(11)
Net increase (decrease) in cash	(1,724)	3,410	(376)
Cash, beginning of year	3,494	84	460
Cash, end of year	$ 1,770	$ 3,494	$ 84