Loans and Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	$ 230,703	$ 216,013
Total gross loans, net of deferred fees, After one but within five years	632,985	554,293
Total gross loans, net of deferred fees, After five years	756,513	616,764
Total gross loans, net of deferred fees	1,620,201	1,387,070
Loans maturing after one year with: fixed interest rates	1,056,262	875,991
Loans maturing after one year with: floating interest rates	333,236	295,066
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	154,511	150,364
Total gross loans, net of deferred fees, After one but within five years	528,574	453,569
Total gross loans, net of deferred fees, After five years	400,964	303,020
Total gross loans, net of deferred fees	1,084,049	906,953
Commercial [Member] | Owner occupied RE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	25,962	24,171
Total gross loans, net of deferred fees, After one but within five years	164,564	167,425
Total gross loans, net of deferred fees, After five years	181,594	125,222
Total gross loans, net of deferred fees	372,120	316,818
Commercial [Member] | Non-owner occupied RE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	35,003	39,519
Total gross loans, net of deferred fees, After one but within five years	213,384	165,764
Total gross loans, net of deferred fees, After five years	150,779	107,515
Total gross loans, net of deferred fees	399,166	312,798
Commercial [Member] | Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	74,091	73,588
Total gross loans, net of deferred fees, After one but within five years	124,489	107,584
Total gross loans, net of deferred fees, After five years	45,768	44,986
Total gross loans, net of deferred fees	244,348	226,158
Commercial [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	19,455	13,086
Total gross loans, net of deferred fees, After one but within five years	26,137	12,796
Total gross loans, net of deferred fees, After five years	22,823	25,297
Total gross loans, net of deferred fees	68,415	51,179
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	76,192	65,649
Total gross loans, net of deferred fees, After one but within five years	104,411	100,724
Total gross loans, net of deferred fees, After five years	355,549	313,744
Total gross loans, net of deferred fees	536,152	480,117
Consumer [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	7,961	7,203
Total gross loans, net of deferred fees, After one but within five years	10,714	11,371
Total gross loans, net of deferred fees, After five years	4,537	4,001
Total gross loans, net of deferred fees	23,212	22,575
Consumer [Member] | Real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	37,128	30,172
Total gross loans, net of deferred fees, After one but within five years	67,254	61,809
Total gross loans, net of deferred fees, After five years	206,889	181,069
Total gross loans, net of deferred fees	311,271	273,050
Consumer [Member] | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	11,097	13,331
Total gross loans, net of deferred fees, After one but within five years	25,556	25,807
Total gross loans, net of deferred fees, After five years	127,001	117,003
Total gross loans, net of deferred fees	163,654	156,141
Consumer [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	20,006	14,943
Total gross loans, net of deferred fees, After one but within five years	887	1,737
Total gross loans, net of deferred fees, After five years	17,122	11,671
Total gross loans, net of deferred fees	$ 38,015	$ 28,351