Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Loan and Lease Financings
Recorded investment in loans and leases	$ 3,852,699	$ 3,688,574	$ 3,723,535
Residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	597,602	588,569
Residential real estate
Loan and Lease Financings
Recorded investment in loans and leases	454,730	445,759	454,845
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	142,872	142,810	$ 128,756
Performing | Residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	594,789	585,394
Performing | Residential real estate
Loan and Lease Financings
Recorded investment in loans and leases	452,182	442,918
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 142,607	142,476
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	$ 2,813	3,175
Nonperforming | Residential real estate
Loan and Lease Financings
Recorded investment in loans and leases	2,548	2,841
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 265	$ 334