Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,839,823	$ 4,527,678
Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	660,011	654,268
Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	524,112	526,122
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	135,899	128,146
Performing | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	657,865	651,785
Performing | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	522,166	523,803
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 135,699	127,982
Nonperforming
Loan and Lease Financings
Classification of nonperforming loans, threshold period past due	90 days
Nonperforming | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	$ 2,146	2,483
Nonperforming | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	1,946	2,319
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 200	$ 164