Loans (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) contract	Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	$ 3,521,925	$ 3,622,119
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	353,046	$ 372,989
Small Business Administration Paycheck Protection Program | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	$ 136,000
Financing receivable, number of contracts | contract	2,500
Small business administration paycheck protection program forgiveness proceeds	$ 110,000