Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 17,178	$ 13,959
Interest expense	3,136	2,352
Net interest income (loss)	14,042	11,607
Provision for loan losses	500	500
Noninterest income	2,420	2,051
Noninterest expense	9,205	8,360
Net income (loss) before taxes	6,757	4,798
Income tax provision (benefit)	1,543	1,686
Net income (loss)	5,214	3,112
Total assets	1,729,299	1,467,938	$ 1,624,625
Commercial and Retail Banking [Member]
Segment Reporting Information [Line Items]
Interest income	17,078	13,893
Interest expense	3,019	2,223
Net interest income (loss)	14,059	11,670
Provision for loan losses	500	500
Noninterest income	1,092	994
Noninterest expense	8,181	7,446
Net income (loss) before taxes	6,470	44,718
Income tax provision (benefit)	1,483	1,653
Net income (loss)	4,987	3,065
Total assets	1,720,017	1,459,695
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Interest income	100	66
Interest expense
Net interest income (loss)	100	66
Provision for loan losses
Noninterest income	1,328	1,057
Noninterest expense	964	848
Net income (loss) before taxes	464	275
Income tax provision (benefit)	97	102
Net income (loss)	367	173
Total assets	8,814	7,808
Corporate [Member]
Segment Reporting Information [Line Items]
Interest income	2	2
Interest expense	119	131
Net interest income (loss)	(117)	(129)
Provision for loan losses
Noninterest income
Noninterest expense	60	66
Net income (loss) before taxes	(177)	(195)
Income tax provision (benefit)	(37)	(69)
Net income (loss)	(140)	(126)
Total assets	168,137	136,996
Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	(2)	(2)
Interest expense	(2)	(2)
Net interest income (loss)
Provision for loan losses
Noninterest income
Noninterest expense
Net income (loss) before taxes
Income tax provision (benefit)
Net income (loss)
Total assets	$ (167,669)	$ (136,561)