Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 20,248	$ 13,328	$ 14,380	$ 13,167
Charge-offs	(102)	(226)	(1,295)	(524)
Recoveries on loans previously charged off	74	94	384	244
Provision (reversal) for loan losses	4,326	(102)	11,077	207
Ending balance	24,546	13,094	24,546	13,094
Allowance for loan losses:
Individually evaluated for impairment					$ 88	$ 19
Collectively evaluated for impairment					24,458	14,361
Total	24,546	13,094	24,546	13,094	24,546	14,380
Loans receivable:
Individually evaluated for impairment					3,475	4,559
Collectively evaluated for impairment					1,575,329	1,446,272
Total					1,578,804	1,450,831
Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15,545	9,711	9,854	9,104
Charge-offs	0	0	(138)	(19)
Recoveries on loans previously charged off	0	0	56	4
Provision (reversal) for loan losses	2,556	(33)	8,329	589
Ending balance	18,101	9,678	18,101	9,678
Allowance for loan losses:
Individually evaluated for impairment					9	4
Collectively evaluated for impairment					18,092	9,850
Total	18,101	9,678	18,101	9,678	18,101	9,854
Loans receivable:
Individually evaluated for impairment					1,535	2,158
Collectively evaluated for impairment					1,212,818	1,184,903
Total					1,214,353	1,187,061
Commercial and Industrial
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,337	3,426	4,354	3,877
Charge-offs	0	(179)	(916)	(347)
Recoveries on loans previously charged off	18	38	223	112
Provision (reversal) for loan losses	1,686	(6)	2,380	(363)
Ending balance	6,041	3,279	6,041	3,279
Allowance for loan losses:
Individually evaluated for impairment					79	15
Collectively evaluated for impairment					5,962	4,339
Total	6,041	3,279	4,354	3,279	6,041	4,354
Loans receivable:
Individually evaluated for impairment					1,940	2,401
Collectively evaluated for impairment					340,578	238,079
Total					342,518	240,480
Other Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	366	191	172	186
Charge-offs	(102)	(47)	(241)	(158)
Recoveries on loans previously charged off	56	56	105	128
Provision (reversal) for loan losses	84	(63)	368	(19)
Ending balance	404	137	404	137
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					404	172
Total	404	$ 137	404	$ 137	404	172
Loans receivable:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					21,933	23,290
Total					$ 21,933	$ 23,290
COVID-19 Pandemic
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (reversal) for loan losses	$ 4,300		$ 11,100