Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 670,110	$ 615,774
Commitments to fund loans [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	185,842	149,391
Unfunded Commitment Line Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	469,943	452,851
Commercial And Standby Letters Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 14,325	$ 13,532