Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,234,862	$ 4,188,071
Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	650,758	651,744
Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	522,772	521,931
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	127,986	129,813
Performing | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	647,718	648,481
Performing | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	519,948	518,896
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 127,770	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	$ 3,040	3,263
Nonperforming | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	2,824	3,035
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 216	$ 228