Loans and Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	$ 214,009	$ 216,013
Total gross loans, net of deferred fees, After one but within five years	597,531	554,293
Total gross loans, net of deferred fees, After five years	647,842	616,764
Total gross loans, net of deferred fees	1,459,382	1,387,070
Loans maturing after one year with: fixed interest rates	942,192	875,991
Loans maturing after one year with: floating interest rates	303,181	295,066
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	144,355	150,364
Total gross loans, net of deferred fees, After one but within five years	496,224	453,569
Total gross loans, net of deferred fees, After five years	329,126	303,020
Total gross loans, net of deferred fees	969,705	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	23,682	24,171
Total gross loans, net of deferred fees, After one but within five years	177,441	167,425
Total gross loans, net of deferred fees, After five years	138,321	125,222
Total gross loans, net of deferred fees	339,444	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	39,636	39,519
Total gross loans, net of deferred fees, After one but within five years	178,214	165,764
Total gross loans, net of deferred fees, After five years	121,381	107,515
Total gross loans, net of deferred fees	339,231	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	67,252	73,588
Total gross loans, net of deferred fees, After one but within five years	119,869	107,584
Total gross loans, net of deferred fees, After five years	47,699	44,986
Total gross loans, net of deferred fees	234,820	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	13,785	13,086
Total gross loans, net of deferred fees, After one but within five years	20,700	12,796
Total gross loans, net of deferred fees, After five years	21,725	25,297
Total gross loans, net of deferred fees	56,210	51,179
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, net of deferred fees, One year or less	69,654	65,649
Total gross loans, net of deferred fees, After one but within five years	101,307	100,724
Total gross loans, net of deferred fees, After five years	318,716	313,744
Total gross loans, net of deferred fees	489,677	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	7,941	7,203
Total gross loans, net of deferred fees, After one but within five years	10,660	11,371
Total gross loans, net of deferred fees, After five years	4,821	4,001
Total gross loans, net of deferred fees	23,422	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	30,218	30,172
Total gross loans, net of deferred fees, After one but within five years	62,393	61,809
Total gross loans, net of deferred fees, After five years	183,120	181,069
Total gross loans, net of deferred fees	275,731	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	11,775	13,331
Total gross loans, net of deferred fees, After one but within five years	27,386	25,807
Total gross loans, net of deferred fees, After five years	116,346	117,003
Total gross loans, net of deferred fees	155,507	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	19,720	14,943
Total gross loans, net of deferred fees, After one but within five years	868	1,737
Total gross loans, net of deferred fees, After five years	14,429	11,671
Total gross loans, net of deferred fees	$ 35,017	$ 28,351