Loans and Allowance for Loan Losses (Details 8) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	$ 15,231	$ 11,450	$ 15,354	$ 11,581	$ 13,019
Recognized interest income	244	146	402	264	637
Commercial [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	10,039	9,438	10,104	9,560	9,222
Recognized interest income	179	128	267	227	465
Commercial [Member] | Owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,800	2,195	2,804	2,204	2,255
Recognized interest income	45	26	62	53	104
Commercial [Member] | Non-owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	3,878	3,620	3,920	3,721	4,144
Recognized interest income	77	48	126	76	199
Commercial [Member] | Business [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	3,361	3,623	3,380	3,635	2,823
Recognized interest income	57	54	79	98	162
Commercial [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income
Consumer [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	5,192	2,012	5,250	2,021	3,797
Recognized interest income	65	18	135	37	172
Consumer [Member] | Other [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	165	180	167	181	174
Recognized interest income	1	1	3	2	6
Consumer [Member] | Real estate [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,892	1,635	2,911	1,642	2,047
Recognized interest income	40	16	81	33	69
Consumer [Member] | Home equity [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,135	197	2,172	198	1,576
Recognized interest income	24	1	51	2	97
Consumer [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income