Loans and Leases (Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing) (Details) - Non-PCI Loans - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 85,419	$ 92,534
Loans and leases greater than 90 days and accruing	2,640	2,978
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	382	1,040
Loans and leases greater than 90 days and accruing	55	0
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	19,009	22,625
Loans and leases greater than 90 days and accruing	0	397
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	91	916
Loans and leases greater than 90 days and accruing	0	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	3,533	2,884
Loans and leases greater than 90 days and accruing	439	428
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,105	1,992
Loans and leases greater than 90 days and accruing	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	130	164
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,912	1,989
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	33,796	38,942
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	23,231	19,990
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,230	1,992
Loans and leases greater than 90 days and accruing	$ 2,146	$ 2,153