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	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 100,701	$ 84,546
Loans and leases greater than 90 days and accruing	3,468	2,888
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	28,846	18,529
Loans and leases greater than 90 days and accruing	1,143	808
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,634	666
Loans and leases greater than 90 days and accruing	0	0
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	20,859	12,594
Loans and leases greater than 90 days and accruing	440	0
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	179	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	5,944	4,624
Loans and leases greater than 90 days and accruing	703	808
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	230	279
Loans and leases greater than 90 days and accruing	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	71,855	66,017
Loans and leases greater than 90 days and accruing	2,325	2,080
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,786	1,823
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	43,467	35,662
Loans and leases greater than 90 days and accruing	297	0
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	24,145	25,563
Loans and leases greater than 90 days and accruing	34	0
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,457	2,969
Loans and leases greater than 90 days and accruing	$ 1,994	$ 2,080