Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 16,674	$ 13,137	$ 14,380	$ 13,167
Charge-offs	(415)	(252)	(1,193)	(298)
Recoveries on loans previously charged off	134	49	310	150
Provision (reversal) for loan losses	3,855	394	6,751	309
Ending balance	20,248	13,328	20,248	13,328
Allowance for loan losses:
Individually evaluated for impairment					$ 1	$ 19
Collectively evaluated for impairment					20,247	14,361
Total	16,674	13,328	14,380	13,167	20,248	14,380
Loans receivable:
Individually evaluated for impairment					4,369	4,559
Collectively evaluated for impairment					1,549,220	1,446,272
Total					1,553,589	1,450,831
Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,948	9,324	9,854	9,104
Charge-offs	(111)	(17)	(138)	(19)
Recoveries on loans previously charged off	0	0	56	4
Provision (reversal) for loan losses	3,708	404	5,773	622
Ending balance	15,545	9,711	15,545	9,711
Allowance for loan losses:
Individually evaluated for impairment					1	4
Collectively evaluated for impairment					15,544	9,850
Total	15,545	9,711	15,545	9,711	15,545	9,854
Loans receivable:
Individually evaluated for impairment					1,971	2,158
Collectively evaluated for impairment					1,178,468	1,184,903
Total					1,180,439	1,187,061
Commercial and Industrial
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,549	3,608	4,354	3,877
Charge-offs	(241)	(168)	(916)	(168)
Recoveries on loans previously charged off	114	33	205	74
Provision (reversal) for loan losses	(85)	(47)	694	(357)
Ending balance	4,337	3,426	4,337	3,426
Allowance for loan losses:
Individually evaluated for impairment					0	15
Collectively evaluated for impairment					4,337	4,339
Total	4,337	3,426	4,337	3,877	4,337	4,354
Loans receivable:
Individually evaluated for impairment					2,398	2,401
Collectively evaluated for impairment					349,202	238,079
Total					351,600	240,480
Other Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	177	205	172	186
Charge-offs	(63)	(67)	(139)	(111)
Recoveries on loans previously charged off	20	16	49	72
Provision (reversal) for loan losses	232	37	284	44
Ending balance	366	191	366	191
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					366	172
Total	366	$ 191	172	$ 186	366	172
Loans receivable:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					21,550	23,290
Total					$ 21,550	$ 23,290
COVID-19 Pandemic
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (reversal) for loan losses	$ 4,200		$ 6,800