Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 663,262	$ 615,774
Commitments to fund loans [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	181,052	149,391
Unfunded Commitment Line Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	467,180	452,851
Commercial And Standby Letters Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 15,030	$ 13,532