Reportable Segments (Schedule of financial information for each reportable segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Interest income	$ 24,056	$ 19,865	$ 68,756	$ 55,578
Interest expense	6,777	4,364	19,120	11,423
Net interest income (loss)	17,279	15,501	49,636	44,155
Provision for loan losses	650	400	1,250	1,300
Noninterest income	4,396	2,533	11,480	7,725
Noninterest expense	11,484	10,188	33,500	29,372
Net income (loss) before taxes	9,541	7,446	26,366	21,208
Income tax provision (benefit)	2,129	1,664	5,705	4,702
Net income (loss)	7,412	5,782	20,661	16,506
Total assets	2,201,626	1,857,707	2,201,626	1,857,707	$ 1,900,614
Commercial And Retail Banking [Member]
Segment Reporting Information [Line Items]
Interest income	23,830	19,775	68,283	55,290
Interest expense	6,628	4,212	18,649	10,993
Net interest income (loss)	17,202	15,563	49,634	44,297
Provision for loan losses	650	400	1,250	1,300
Noninterest income	1,341	1,179	3,739	3,414
Noninterest expense	9,529	9,046	28,604	25,982
Net income (loss) before taxes	8,364	7,296	23,519	20,429
Income tax provision (benefit)	1,882	1,632	5,107	4,538
Net income (loss)	6,482	5,664	18,412	15,891
Total assets	2,187,449	1,847,633	2,187,449	1,847,633
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Interest income	226	90	473	288
Interest expense
Net interest income (loss)	226	90	473	288
Provision for loan losses
Noninterest income	3,055	1,354	7,741	4,311
Noninterest expense	1,895	1,082	4,716	3,210
Net income (loss) before taxes	1,386	362	3,498	1,389
Income tax provision (benefit)	291	76	735	292
Net income (loss)	1,095	286	2,763	1,097
Total assets	13,765	9,649	13,765	9,649
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Interest income	4	2	9	6
Interest expense	153	154	480	436
Net interest income (loss)	(149)	(152)	(471)	(430)
Provision for loan losses
Noninterest income
Noninterest expense	60	60	180	180
Net income (loss) before taxes	(209)	(212)	(651)	(610)
Income tax provision (benefit)	(44)	(44)	(137)	(128)
Net income (loss)	(165)	(168)	(514)	(482)
Total assets	234,845	180,420	234,845	180,420
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	(4)	(2)	(9)	(6)
Interest expense	(4)	(2)	(9)	(6)
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	$ (234,433)	$ (179,995)	$ (234,433)	$ (179,995)