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, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 108,816	$ 84,546
Loans and leases greater than 90 days and accruing	4,247	2,888
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	37,825	18,529
Loans and leases greater than 90 days and accruing	1,895	808
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	5,372	666
Loans and leases greater than 90 days and accruing	0	0
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	24,993	12,594
Loans and leases greater than 90 days and accruing	796	0
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	709	366
Loans and leases greater than 90 days and accruing	0	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	6,630	4,624
Loans and leases greater than 90 days and accruing	1,099	808
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	121	279
Loans and leases greater than 90 days and accruing	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	70,991	66,017
Loans and leases greater than 90 days and accruing	2,352	2,080
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,716	1,823
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	43,677	35,662
Loans and leases greater than 90 days and accruing	439	0
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	22,748	25,563
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,850	2,969
Loans and leases greater than 90 days and accruing	$ 1,913	$ 2,080