Business Segments - Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	[1]
Business Segments
Number of Operating Segments | segment			3
Revenues:
Interest income	$ 24,276	$ 22,651	$ 47,227	$ 45,395
Gains on sales of loans	2,955	2,408	5,091	4,647
Other noninterest income	5,247	4,833	10,214	9,040
Total operating income	32,478	29,892	62,532	59,082
Expenses:
Provision for loan losses	1,810	2,000	4,205	5,300
Interest expense	3,651	2,664	6,955	5,240
Salaries and employee benefits	11,495	11,073	23,402	21,806
Other noninterest expenses	8,054	7,688	15,824	15,494
Total operating expenses	25,010	23,425	50,386	47,840
Income (loss) before income taxes	7,468	6,467	12,146	11,242
Income tax expense (benefit)	1,626	1,397	2,533	2,280
Net income	5,842	5,070	9,613	8,962
Total assets	1,567,996	1,535,643	1,567,996	1,535,643	$ 1,521,411
Goodwill	14,425	14,425	14,425	14,425	$ 14,425
Capital expenditures	717	1,067	1,471	1,688
Operating Segments | Retail Banking
Revenues:
Interest income	15,419	13,209	29,743	26,369
Other noninterest income	3,090	2,896	6,025	5,515
Total operating income	18,509	16,105	35,768	31,884
Expenses:
Provision for loan losses	110		110
Interest expense	2,493	1,631	4,668	3,248
Salaries and employee benefits	7,070	6,754	14,545	13,240
Other noninterest expenses	5,140	4,837	10,043	9,818
Total operating expenses	14,813	13,222	29,366	26,306
Income (loss) before income taxes	3,696	2,883	6,402	5,578
Income tax expense (benefit)	625	439	1,041	822
Net income	3,071	2,444	5,361	4,756
Total assets	1,393,186	1,366,671	1,393,186	1,366,671
Goodwill	3,702	3,702	3,702	3,702
Capital expenditures	566	1,022	1,288	1,594
Operating Segments | Mortgage Banking
Revenues:
Interest income	669	499	1,019	866
Gains on sales of loans	2,955	2,408	5,091	4,647
Other noninterest income	1,488	1,246	2,806	2,103
Total operating income	5,112	4,153	8,916	7,616
Expenses:
Interest expense	409	217	572	360
Salaries and employee benefits	1,764	1,560	3,391	3,003
Other noninterest expenses	1,335	1,318	2,579	2,593
Total operating expenses	3,508	3,095	6,542	5,956
Income (loss) before income taxes	1,604	1,058	2,374	1,660
Income tax expense (benefit)	422	279	625	446
Net income	1,182	779	1,749	1,214
Total assets	106,608	69,916	106,608	69,916
Capital expenditures	52	38	76	59
Operating Segments | Consumer Finance
Revenues:
Interest income	10,365	10,731	20,510	21,580
Other noninterest income	137	162	333	410
Total operating income	10,502	10,893	20,843	21,990
Expenses:
Provision for loan losses	1,700	2,000	4,095	5,300
Interest expense	2,618	2,317	5,169	4,482
Salaries and employee benefits	2,096	2,228	4,348	4,493
Other noninterest expenses	1,411	1,388	2,786	2,695
Total operating expenses	7,825	7,933	16,398	16,970
Income (loss) before income taxes	2,677	2,960	4,445	5,020
Income tax expense (benefit)	728	804	1,211	1,366
Net income	1,949	2,156	3,234	3,654
Total assets	310,538	295,678	310,538	295,678
Goodwill	10,723	10,723	10,723	10,723
Capital expenditures	32	7	40	35
Operating Segments | Other
Revenues:
Interest income	2		4
Other noninterest income	532	529	1,050	1,012
Total operating income	534	529	1,054	1,012
Expenses:
Interest expense	310	287	595	570
Salaries and employee benefits	565	531	1,118	1,070
Other noninterest expenses	168	145	416	388
Total operating expenses	1,043	963	2,129	2,028
Income (loss) before income taxes	(509)	(434)	(1,075)	(1,016)
Income tax expense (benefit)	(149)	(125)	(344)	(354)
Net income	(360)	(309)	(731)	(662)
Total assets	6,955	5,038	6,955	5,038
Capital expenditures	67		67
Eliminations
Revenues:
Interest income	(2,179)	(1,788)	(4,049)	(3,420)
Total operating income	(2,179)	(1,788)	(4,049)	(3,420)
Expenses:
Interest expense	(2,179)	(1,788)	(4,049)	(3,420)
Total operating expenses	(2,179)	(1,788)	(4,049)	(3,420)
Total assets	$ (249,291)	$ (201,660)	$ (249,291)	$ (201,660)

[1] Derived from audited consolidated financial statements.