Loans - Change in the Balances of the ALLL (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for loan losses:
Balance, beginning of period	$ 24,465	$ 19,976	$ 21,840	$ 17,896
Provision (credit) charged to expense	2,509	2,824	6,461	5,498
Losses charged off	(241)	(1,182)	(1,755)	(1,948)
Recoveries	184	65	371	237
Balance, end of period	26,917	21,683	26,917	21,683
Commercial and industrial
Allowance for loan losses:
Balance, beginning of period	1,477	1,795	1,521	1,384
Provision (credit) charged to expense	(227)	519	(22)	1,042
Losses charged off	(99)	(800)	(353)	(912)
Recoveries	0	0	5	0
Balance, end of period	1,151	1,514	1,151	1,514
Owner-occupied commercial real estate
Allowance for loan losses:
Balance, beginning of period	846	624	561	891
Provision (credit) charged to expense	167	26	452	(241)
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	1,013	650	1,013	650
Investor commercial real estate
Allowance for loan losses:
Balance, beginning of period	130	169	109	61
Provision (credit) charged to expense	0	(65)	21	43
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	130	104	130	104
Construction
Allowance for loan losses:
Balance, beginning of period	721	302	380	251
Provision (credit) charged to expense	155	39	496	90
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	876	341	876	341
Single tenant lease financing
Allowance for loan losses:
Balance, beginning of period	11,318	9,661	11,175	8,827
Provision (credit) charged to expense	717	1,633	860	2,467
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	12,035	11,294	12,035	11,294
Public finance
Allowance for loan losses:
Balance, beginning of period	1,542	1,763	1,580	1,670
Provision (credit) charged to expense	191	(198)	153	(105)
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	1,733	1,565	1,733	1,565
Healthcare finance
Allowance for loan losses:
Balance, beginning of period	4,762	2,293	3,247	1,264
Provision (credit) charged to expense	1,232	499	3,490	1,528
Losses charged off	0	0	(743)	0
Recoveries	87	0	87	0
Balance, end of period	6,081	2,792	6,081	2,792
Small business lending
Allowance for loan losses:
Balance, beginning of period	251	129	54	95
Provision (credit) charged to expense	230	(3)	413	31
Losses charged off	0	0	0	0
Recoveries	3	0	17	0
Balance, end of period	484	126	484	126
Residential mortgage
Allowance for loan losses:
Balance, beginning of period	539	662	657	1,079
Provision (credit) charged to expense	26	10	(81)	(409)
Losses charged off	0	(1)	(15)	(1)
Recoveries	0	1	4	3
Balance, end of period	565	672	565	672
Home equity
Allowance for loan losses:
Balance, beginning of period	51	48	46	53
Provision (credit) charged to expense	(1)	(5)	(1)	(16)
Losses charged off	0	0	0	0
Recoveries	3	2	8	8
Balance, end of period	53	45	53	45
Other consumer
Allowance for loan losses:
Balance, beginning of period	2,828	2,530	2,510	2,321
Provision (credit) charged to expense	19	369	680	1,068
Losses charged off	(142)	(381)	(644)	(1,035)
Recoveries	91	62	250	226
Balance, end of period	$ 2,796	$ 2,580	$ 2,796	$ 2,580