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) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 186,454	$ 168,717	$ 121,689
Loans and leases greater than 90 days and accruing	3,587		27,548
Non-PCI Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	40,099	42,407	42,407
Loans and leases greater than 90 days and accruing	2,128		1,094
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,564	4,281	4,281
Loans and leases greater than 90 days and accruing	0		0
Non-PCI Loans | Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	19,567	24,476
Loans and leases greater than 90 days and accruing	1,288
Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	8,258	5,965
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	10,710	7,685	7,365
Loans and leases greater than 90 days and accruing	840		1,094
Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			29,733
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			708
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			320
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	90,828	72,539	72,539
Loans and leases greater than 90 days and accruing	1,459		2,197
Non-PCI Loans | Consumer | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	689	2,828	2,828
Loans and leases greater than 90 days and accruing	215		0
Non-PCI Loans | Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	63,646	44,357	44,357
Loans and leases greater than 90 days and accruing	65		45
Non-PCI Loans | Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	22,945	22,411
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,634	2,145
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	914	798
Loans and leases greater than 90 days and accruing	1,179
Non-PCI Loans | Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			22,411
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			2,943
Loans and leases greater than 90 days and accruing			2,152
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	55,527	53,771	6,743
Loans and leases greater than 90 days and accruing	0		$ 24,257
Adoption of ASC 326 | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 27,500	$ 47,000