Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,381,314	$ 4,188,071
Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	655,511	651,744
Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	526,592	521,931
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	128,919	129,813
Performing | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	652,057	648,481
Performing | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	523,380	518,896
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 128,677	129,585
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	$ 3,454	3,263
Nonperforming | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	3,212	3,035
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 242	$ 228