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	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 114,946	$ 84,546
Loans and leases greater than 90 days and accruing	3,291	2,888
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	42,407	18,529
Loans and leases greater than 90 days and accruing	1,094	808
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	4,281	666
Loans and leases greater than 90 days and accruing	0	0
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	29,733	12,594
Loans and leases greater than 90 days and accruing	0	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	7,365	4,624
Loans and leases greater than 90 days and accruing	1,094	808
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	708	366
Loans and leases greater than 90 days and accruing	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	320	279
Loans and leases greater than 90 days and accruing	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	72,539	66,017
Loans and leases greater than 90 days and accruing	2,197	2,080
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,828	1,823
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	44,357	35,662
Loans and leases greater than 90 days and accruing	45	0
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	22,411	25,563
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,943	2,969
Loans and leases greater than 90 days and accruing	$ 2,152	$ 2,080