Loan and Lease Financings (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,188,071	$ 3,994,692
Residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	651,744	612,608
Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	521,931	490,468
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	129,813	122,140
Performing | Residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	648,481	610,416
Performing | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	518,896	488,436
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 129,585	121,980
Nonperforming
Loan and Lease Financings
Classification of nonperforming loans, threshold period past due	90 days
Nonperforming | Residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	$ 3,263	2,192
Nonperforming | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	3,035	2,032
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 228	$ 160