Loans and Leases and Allowance for Credit Losses - Recorded investment in nonaccrual loans by loan class (Details) - Loans Receivable - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 35,341	$ 23,778
Indirect auto
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	0	726
Commercial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	20,503	12,280
Commercial | Owner occupied commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	10,544	6,421
Commercial | Income producing commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	1,996	1,160
Commercial | Commercial & industrial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,545	1,417
Commercial | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,277	605
Commercial | Equipment financing
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	3,141	2,677
Residential | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	939	288
Residential | Residential mortgage
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	10,567	8,035
Residential | Home equity lines of credit
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	3,173	2,360
Consumer
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 159	$ 89