Segment and Related Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	[1]
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Interest income	$ 16,668	$ 14,681
Interest expense	2,125	1,547
Noninterest income	3,333	3,271
Income (loss) before income taxes	7,218	5,664
Net income (loss)	5,812	4,063
Depreciation and amortization	543	609
Total assets	1,817,574	1,715,805	$ 1,816,078
Goodwill	43,872	43,872	$ 43,872
Capital expenditures	345	663
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	16,580	14,596
Interest expense	1,835	1,308
Noninterest income	2,063	2,161
Income (loss) before income taxes	7,026	5,457
Net income (loss)	5,653	3,896
Depreciation and amortization	540	606
Total assets	1,807,991	1,706,564
Goodwill	43,872	43,872
Capital expenditures	345	657
Operating Segments | Trust and Investment Services
Segment Reporting Information [Line Items]
Interest income	0	0
Interest expense	0	0
Noninterest income	1,151	1,104
Income (loss) before income taxes	453	541
Net income (loss)	365	388
Depreciation and amortization	3	3
Total assets	0	0
Goodwill	0	0
Capital expenditures	0	6
Other
Segment Reporting Information [Line Items]
Interest income	88	85
Interest expense	290	239
Noninterest income	119	6
Income (loss) before income taxes	(261)	(334)
Net income (loss)	(206)	(221)
Depreciation and amortization	0	0
Total assets	237,802	232,206
Goodwill	0	0
Capital expenditures	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	0	0
Interest expense	0	0
Noninterest income	0	0
Income (loss) before income taxes	0	0
Net income (loss)	0	0
Depreciation and amortization	0	0
Total assets	(228,219)	(222,965)
Goodwill	0	0
Capital expenditures	$ 0	$ 0

[1] Derived from audited consolidated financial statements.