Segment and Related Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Interest income	$ 56,170	$ 55,169	$ 47,455
Interest expense	6,316	5,904	5,730
Noninterest income	13,505	13,287	11,176
Income (loss) before income taxes	23,308	21,059	17,943
Net income (loss)	16,301	15,039	12,741
Depreciation and amortization	2,856	3,034	2,802
Total assets	1,678,638	1,547,599	1,346,492
Goodwill	43,872	43,872	39,043
Capital expenditures	3,613	1,474	1,049
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	56,076	55,109	47,395
Interest expense	5,438	5,144	4,988
Noninterest income	8,848	8,386	6,317
Income (loss) before income taxes	22,230	19,398	15,953
Net income (loss)	15,486	13,793	11,277
Depreciation and amortization	2,845	3,022	2,791
Total assets	1,669,629	1,545,377	1,338,465
Goodwill	43,872	43,872	39,043
Capital expenditures	3,609	1,453	1,046
Operating Segments | Trust and Investment Services
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Noninterest income	4,634	4,881	4,840
Income (loss) before income taxes	2,623	2,737	3,012
Net income (loss)	1,835	1,956	2,138
Depreciation and amortization	11	12	11
Total assets	0	0	0
Goodwill	0	0	0
Capital expenditures	4	21	3
Other
Segment Reporting Information [Line Items]
Interest income	94	60	60
Interest expense	878	760	742
Noninterest income	23	20	19
Income (loss) before income taxes	(1,545)	(1,076)	(1,022)
Net income (loss)	(1,020)	(710)	(674)
Depreciation and amortization	0	0	0
Total assets	229,241	225,533	201,482
Goodwill	0	0	0
Capital expenditures	0	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Noninterest income	0	0	0
Income (loss) before income taxes	0	0	0
Net income (loss)	0	0	0
Depreciation and amortization	0	0	0
Total assets	(220,232)	(223,311)	(193,455)
Goodwill	0	0	0
Capital expenditures	$ 0	$ 0	$ 0