Loan and Lease Financings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Total loans and leases	$ 4,188,071	$ 3,994,692
Deferred loan and lease costs	3,780	3,960
Direct finance leases:
Rentals receivable	218,543	206,426
Estimated residual value of leased assets	21,992	15,756
Gross investment in lease financing	240,535	222,182
Unearned income	(35,751)	(32,499)
Net investment in lease financing	204,784	189,683
Minimum future lease payments receivable
2017	51,010
2018	45,690
2019	39,120
2020	32,130
2021	24,530
Loans to certain directors, executive officers, and principal shareholders of equity securities of the entity and to their affiliates
Loan to related parties	31,460	$ 33,360
New loans and other additions to related parties	6,790
Repayments and other reductions of loan given to related parties	$ 8,690