Loans (Loans Purchased and/or Sold During the Year by Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 0	$ 2,051
Sales	252	0
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Commercial and Industrial Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases		2,051
Sales		0
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	252	$ 0
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0
Sales	$ 0