Loans and Leases and Allowance for Credit Losses - Recorded investment in nonaccrual loans by loan class (Details) - Loans Receivable - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 23,778	$ 23,658
Home equity lines of credit
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,360	2,024
Indirect auto
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	726	1,637
Commercial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	12,280	10,986
Commercial | Owner occupied commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	6,421	4,923
Commercial | Income producing commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	1,160	3,208
Commercial | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	605	758
Commercial | Equipment financing
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,677	0
Commercial | Commercial & industrial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	1,417	2,097
Residential | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	288	192
Residential | Residential mortgage
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	8,035	8,776
Consumer direct
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 89	$ 43