Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) loan	Mar. 31, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	30	40
Recorded Investment(a)	$ 4,899	$ 4,739
Unpaid Principal Balance(b)	$ 6,175	$ 4,776
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment(a)	$ 48	$ 0
Unpaid Principal Balance(b)	$ 48	$ 0
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	1
Recorded Investment(a)	$ 290	$ 78
Unpaid Principal Balance(b)	$ 321	$ 78
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment(a)	$ 570	$ 0
Unpaid Principal Balance(b)	$ 1,740	$ 0
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment(a)	$ 122	$ 0
Unpaid Principal Balance(b)	$ 122	$ 0
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	18	25
Recorded Investment(a)	$ 3,592	$ 4,357
Unpaid Principal Balance(b)	$ 3,668	$ 4,374
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	8	13
Recorded Investment(a)	$ 277	$ 293
Unpaid Principal Balance(b)	$ 277	$ 312
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 11
Unpaid Principal Balance(b)	$ 0	$ 11