Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	86	77	131
Recorded Investment	$ 11,429	$ 9,426	$ 9,270
Unpaid Principal Balance	$ 11,792	$ 11,900	$ 9,631
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	8	8
Recorded Investment	$ 1,315	$ 3,991	$ 1,509
Unpaid Principal Balance	$ 1,330	$ 6,339	$ 1,526
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	2	1
Recorded Investment	$ 0	$ 690	$ 116
Unpaid Principal Balance	$ 0	$ 690	$ 122
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	0	0
Recorded Investment	$ 1,393	$ 0	$ 0
Unpaid Principal Balance	$ 1,472	$ 0	$ 0
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1
Recorded Investment	$ 78	$ 0	$ 65
Unpaid Principal Balance	$ 80	$ 0	$ 91
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	41	45	63
Recorded Investment	$ 6,977	$ 4,238	$ 5,535
Unpaid Principal Balance	$ 7,210	$ 4,364	$ 5,792
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	34	22	57
Recorded Investment	$ 1,649	$ 507	$ 2,030
Unpaid Principal Balance	$ 1,681	$ 507	$ 2,084
Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	0	1
Recorded Investment	$ 17	$ 0	$ 15
Unpaid Principal Balance	$ 19	$ 0	$ 16