Loan and Lease Financings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Total loans and leases	$ 3,994,692	$ 3,688,574
Deferred loan and lease costs	3,960	4,000
Direct finance leases:
Rentals receivable	206,426	234,772
Estimated residual value of leased assets	15,756	13,458
Gross investment in lease financing	222,182	248,230
Unearned income	(32,499)	(37,356)
Net investment in lease financing	189,683	210,874
Minimum future lease payments receivable
2016	44,530
2017	41,610
2018	36,230
2019	29,360
2020	25,190
Loans to certain directors, executive officers, and principal shareholders of equity securities of the entity and to their affiliates
Loan to related parties	33,360	$ 27,930
New loans and other additions to related parties	14,340
Repayments and other reductions of loan given to related parties	$ 8,910