Loans (Information as to Impaired Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Total performing troubled debt restructurings	$ 3,700	$ 3,900
Total recorded investment	15,004	17,870
Performing
Financing Receivable, Impaired [Line Items]
Total performing troubled debt restructurings	1,100	906
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total recorded investment	9,903	11,652
Residential real estate
Financing Receivable, Impaired [Line Items]
Total recorded investment	1,380	1,386
Financial Asset, Excluding Purchased Credit Impaired Loans
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	15,224	18,529
Total recorded investment	16,364	19,435
Financial Asset, Excluding Purchased Credit Impaired Loans | Performing
Financing Receivable, Impaired [Line Items]
Total performing troubled debt restructurings	1,140	906
Financial Asset, Excluding Purchased Credit Impaired Loans | Commercial and industrial | Performing
Financing Receivable, Impaired [Line Items]
Total performing troubled debt restructurings	541	547
Financial Asset, Excluding Purchased Credit Impaired Loans | Residential real estate | Performing
Financing Receivable, Impaired [Line Items]
Total performing troubled debt restructurings	$ 599	$ 359