Loans - Impaired Loans (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($) security loan	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	$ 6,503,000		$ 6,503,000		$ 9,534,000
Loans without a specific valuation allowance - Unpaid Principal Balance	6,666,000		6,666,000		9,675,000
Loans without a specific valuation allowance	0		0		0
Impaired Loans	7,266,000		7,266,000		4,887,000
Loans with a specific valuation allowance - Unpaid Principal Balance	7,306,000		7,306,000		4,924,000
Loans with a specific valuation allowance	2,077,000		2,077,000		1,769,000
Impaired Financing Receivable, Recorded Investment	13,769,000		13,769,000		14,421,000
Impaired Financing Receivable, Unpaid Principal Balance	13,972,000		13,972,000		14,599,000
Impaired Financing Receivable, Related Allowance	2,077,000		2,077,000		1,769,000
Loans without a specific valuation allowance - Average Balance	6,550,000	$ 12,016,000	7,034,000	$ 10,496,000
Loans without a specific valuation allowance - Interest Income	55,000	122,000	122,000	382,000
Loans with a specific valuation allowance - Average Balance	6,160,000	2,205,000	5,309,000	853,000
Loans with a specific valuation allowance - Interest Income	51,000	0	51,000	0
Impaired Financing Receivable, Average Recorded Investment	12,710,000	14,221,000	12,343,000	11,349,000
Impaired Financing Receivable, Interest Income, Accrual Method	106,000	$ 122,000	173,000	382,000
Other real estate owned	0		0		2,065,000
Mortgage loans in process of foreclosure, amount	$ 0		0		0
Number of contracts classified as TDRs | security	0	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	$ 517,000		517,000		2,693,000
Loans without a specific valuation allowance - Unpaid Principal Balance	517,000		517,000		2,694,000
Loans without a specific valuation allowance	0		0		0
Impaired Loans	118,000		118,000		207,000
Loans with a specific valuation allowance - Unpaid Principal Balance	140,000		140,000		244,000
Loans with a specific valuation allowance	50,000		50,000		109,000
Loans without a specific valuation allowance - Average Balance	971,000	$ 4,433,000	1,210,000	4,395,000
Loans without a specific valuation allowance - Interest Income	18,000	70,000	54,000	237,000
Loans with a specific valuation allowance - Average Balance	182,000	1,032,000	196,000	462,000
Loans with a specific valuation allowance - Interest Income	18,000	$ 0	18,000	$ 0
Number of contracts classified as TDRs | loan		4		4
Financing receivable, troubled debt restructuring		$ 2,000,000.0		$ 2,000,000.0
Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	3,246,000		3,246,000		5,663,000
Loans without a specific valuation allowance - Unpaid Principal Balance	3,250,000		3,250,000		5,665,000
Loans without a specific valuation allowance	0		0		0
Loans without a specific valuation allowance - Average Balance	3,586,000	4,803,000	4,244,000	3,244,000
Loans without a specific valuation allowance - Interest Income	29,000	52,000	60,000	145,000
Single tenant lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	217,000		217,000		0
Loans without a specific valuation allowance - Unpaid Principal Balance	217,000		217,000		0
Loans without a specific valuation allowance	0		0		0
Impaired Loans	7,148,000		7,148,000		4,680,000
Loans with a specific valuation allowance - Unpaid Principal Balance	7,166,000		7,166,000		4,680,000
Loans with a specific valuation allowance	2,027,000		2,027,000		1,660,000
Loans with a specific valuation allowance - Average Balance	5,978,000	1,173,000	5,113,000	391,000
Loans with a specific valuation allowance - Interest Income	4,000	0	4,000	0
Healthcare finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	1,034,000		1,034,000		0
Loans without a specific valuation allowance - Unpaid Principal Balance	1,034,000		1,034,000		0
Loans without a specific valuation allowance	0		0		0
Loans without a specific valuation allowance - Average Balance	692,000	231,000	0	0
Loans without a specific valuation allowance - Interest Income	8,000	8,000	0	0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	1,450,000		1,450,000		1,135,000
Loans without a specific valuation allowance - Unpaid Principal Balance	1,543,000		1,543,000		1,209,000
Loans without a specific valuation allowance	0		0		0
Loans without a specific valuation allowance - Average Balance	1,233,000	2,714,000	1,286,000	2,768,000
Loans without a specific valuation allowance - Interest Income	0	0	0	0
Other real estate owned	0		$ 0		0
Number of contracts classified as TDRs | security			1
Financing receivable, troubled debt restructuring	800,000		$ 800,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Average Balance	0	0	0	14,000
Loans without a specific valuation allowance - Interest Income	0	0	0	0
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans without a specific valuation allowance - Recorded Balance	39,000		39,000		43,000
Loans without a specific valuation allowance - Unpaid Principal Balance	105,000		105,000		107,000
Loans without a specific valuation allowance	0		0		$ 0
Loans without a specific valuation allowance - Average Balance	68,000	66,000	63,000	75,000
Loans without a specific valuation allowance - Interest Income	$ 0	$ 0	$ 0	$ 0