Loans (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in allowance for loan losses
Balance, beginning of period	$ 18,757	$ 18,592	$ 18,379	$ 19,164
Charge-offs	(17)	(157)	(240)	(751)
Recoveries	298	130	937	360
Net (charge-offs) recoveries	281	(27)	697	(391)
Provision (credit) for loan losses	(301)	(24)	(339)	(232)
Balance, end of period	18,737	18,541	18,737	18,541
Commercial
Changes in allowance for loan losses
Balance, beginning of period	11,193	11,454	11,187	12,533
Charge-offs	(8)	(132)	(229)	(726)
Recoveries	284	123	766	309
Net (charge-offs) recoveries	276	(9)	537	(417)
Provision (credit) for loan losses	(941)	163	(1,196)	(508)
Balance, end of period	10,528	11,608	10,528	11,608
Real estate
Changes in allowance for loan losses
Balance, beginning of period	7,450	7,069	7,070	6,548
Charge-offs			(2)
Recoveries	14	7	141	51
Net (charge-offs) recoveries	14	7	139	51
Provision (credit) for loan losses	672	(205)	927	272
Balance, end of period	8,136	6,871	8,136	6,871
Consumer
Changes in allowance for loan losses
Balance, beginning of period	114	69	122	83
Charge-offs	(9)	(25)	(9)	(25)
Recoveries			30
Net (charge-offs) recoveries	(9)	(25)	21	(25)
Provision (credit) for loan losses	(32)	18	(70)	4
Balance, end of period	$ 73	$ 62	$ 73	$ 62