Parent corporation only financial statements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 10,848	$ 17,076
Total assets	444,802	419,941	$ 434,004
Liabilities
Other liabilities	6,596	8,116
Total liabilities	401,188	389,582
Shareholders' equity
Preferred stock	23	23
Common stock	5,629	5,562
Additional paid-in capital	58,643	58,497
Accumulated deficit	(21,172)	(33,948)
Accumulated other comprehensive loss	(241)	(507)
Total shareholders' equity	43,614	30,359	$ 19,058	$ 18,244
Liabilities and Equity	444,802	419,941
Parent Company [Member]
Assets
Cash and due from banks	1,770	3,494
Investment in subsidiaries	50,230	38,665
Investment in special purpose subsidiary	264	264
Prepaid expenses and other assets	2,935	45
Total assets	55,199	42,468
Liabilities
Balance due to nonbank subsidiaries	8,764	8,764
Other liabilities	2,821	3,345
Total liabilities	11,585	12,109
Shareholders' equity
Preferred stock	23	23
Common stock	5,629	5,562
Additional paid-in capital	58,643	58,497
Warrant surplus	732	732
Accumulated deficit	(21,172)	(33,948)
Stock in directors rabbi trust	(1,034)	(1,034)
Directors deferred fees obligation	1,034	1,034
Accumulated other comprehensive loss	(241)	(507)
Total shareholders' equity	43,614	30,359
Liabilities and Equity	$ 55,199	$ 42,468