Loans and Leases - Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans and leases
Loan and lease commitments	$ 5,184,705	$ 5,192,874
Real estate
Loans and leases
Loan and lease commitments	1,505,539	1,481,722
Commercial and Industrial
Loans and leases
Loan and lease commitments	2,217,331	2,262,712
Commercial Real Estate | Real estate
Loans and leases
Loan and lease commitments	54,353	46,812
Construction | Real estate
Loans and leases
Loan and lease commitments	499,084	480,926
Residential | Real estate
Loans and leases
Loan and lease commitments	952,102	953,984
Consumer
Loans and leases
Loan and lease commitments	$ 1,461,835	1,448,336
Lease Financing
Loans and leases
Loan and lease commitments		$ 104