Segment and Related Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	[1]
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Interest income	$ 16,274	$ 14,063	$ 46,558	$ 42,003
Interest expense	1,936	1,599	5,174	4,795
Noninterest income	3,804	3,120	10,423	9,784
Income (loss) before income taxes	6,992	5,617	18,855	17,351
Net income (loss)	4,787	3,963	13,129	12,179
Depreciation and amortization	561	673	1,842	2,198
Total assets	1,780,541	1,615,534	1,780,541	1,615,534	$ 1,678,638
Goodwill	43,872	43,872	43,872	43,872	$ 43,872
Capital expenditures	449	267	2,188	536
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	16,188	14,040	46,302	41,950
Interest expense	1,663	1,376	4,418	4,151
Noninterest income	2,479	1,967	6,882	6,302
Income (loss) before income taxes	6,554	5,356	18,140	16,538
Net income (loss)	4,478	3,760	12,591	11,558
Depreciation and amortization	558	671	1,833	2,190
Total assets	1,771,165	1,611,624	1,771,165	1,611,624
Goodwill	43,872	43,872	43,872	43,872
Capital expenditures	449	267	2,177	536
Operating Segments | Trust and Investment Services
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Noninterest income	1,318	1,147	3,522	3,465
Income (loss) before income taxes	794	672	1,853	2,006
Net income (loss)	544	474	1,290	1,408
Depreciation and amortization	3	2	9	8
Total assets	0	0	0	0
Goodwill	0	0	0	0
Capital expenditures	0	0	11	0
Other
Segment Reporting Information [Line Items]
Interest income	86	23	256	53
Interest expense	273	223	756	644
Noninterest income	7	6	19	17
Income (loss) before income taxes	(356)	(411)	(1,138)	(1,193)
Net income (loss)	(235)	(271)	(752)	(787)
Depreciation and amortization	0	0	0	0
Total assets	238,111	231,496	238,111	231,496
Goodwill	0	0	0	0
Capital expenditures	0	0	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Noninterest income	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Net income (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Total assets	(228,735)	(227,586)	(228,735)	(227,586)
Goodwill	0	0	0	0
Capital expenditures	$ 0	$ 0	$ 0	$ 0

[1] Derived from audited consolidated financial statements.