Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	77	85	86
Recorded Investment(a)	$ 36,154	$ 15,940	$ 11,429
Unpaid Principal Balance(b)	$ 37,125	$ 16,150	$ 11,792
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	6	5
Recorded Investment(a)	$ 1,823	$ 7,588	$ 1,315
Unpaid Principal Balance(b)	$ 2,059	$ 7,703	$ 1,330
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	0	0
Recorded Investment(a)	$ 658	$ 0	$ 0
Unpaid Principal Balance(b)	$ 689	$ 0	$ 0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	0	2
Recorded Investment(a)	$ 26,563	$ 0	$ 1,393
Unpaid Principal Balance(b)	$ 26,567	$ 0	$ 1,472
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	1
Recorded Investment(a)	$ 0	$ 77	$ 78
Unpaid Principal Balance(b)	$ 0	$ 77	$ 80
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	36	53	41
Recorded Investment(a)	$ 6,031	$ 7,436	$ 6,977
Unpaid Principal Balance(b)	$ 6,113	$ 7,517	$ 7,210
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	20	24	34
Recorded Investment(a)	$ 1,078	$ 831	$ 1,649
Unpaid Principal Balance(b)	$ 1,697	$ 845	$ 1,681
Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	3
Recorded Investment(a)	$ 0	$ 8	$ 17
Unpaid Principal Balance(b)	$ 0	$ 8	$ 19