Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	$ 14,632	$ 16,977	$ 14,834	$ 16,681	$ 16,387
Recognized interest income	82	113	316	286	456
Commercial [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	12,623	14,062	12,692	13,967	13,760
Recognized interest income	65	91	264	228	380
Commercial [Member] | Owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,191	1,430	1,146	1,680	1,568
Recognized interest income	1	22	5	25	47
Commercial [Member] | Non-owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	5,622	6,582	5,268	5,986	5,693
Recognized interest income	22	31	107	84	104
Commercial [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,887	$ 1,752	2,110	1,790	1,977
Recognized interest income	12		53	14	75
Commercial [Member] | Business [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	3,923	$ 4,298	4,168	4,511	4,522
Recognized interest income	30	38	99	105	154
Consumer [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,009	2,915	2,142	2,714	2,627
Recognized interest income	17	22	52	58	76
Consumer [Member] | Real estate [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,395	2,334	1,529	2,213	2,094
Recognized interest income	12	16	34	40	53
Consumer [Member] | Home equity [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	406	254	376	227	251
Recognized interest income	$ 3	$ 2	$ 13	$ 8	$ 10
Consumer [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income
Consumer [Member] | Other [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	$ 208	$ 327	$ 237	$ 274	$ 282
Recognized interest income	$ 2	$ 4	$ 5	$ 10	$ 13