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	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 191,483	$ 168,717
Loans and leases greater than 90 days and accruing	5,862
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			$ 114,946
Loans and leases greater than 90 days and accruing			3,291
Non-PCI Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	43,322	42,407	42,407
Loans and leases greater than 90 days and accruing	4,312		1,094
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,661	4,281	4,281
Loans and leases greater than 90 days and accruing	0		0
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 | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	10,626	7,685	7,365
Loans and leases greater than 90 days and accruing	540		1,094
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 | Commercial | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	23,103	24,476
Loans and leases greater than 90 days and accruing	3,625
Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	7,932	5,965
Loans and leases greater than 90 days and accruing	147
Non-PCI Loans | Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	93,222	72,539	72,539
Loans and leases greater than 90 days and accruing	1,195		2,197
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	652	2,828	2,828
Loans and leases greater than 90 days and accruing	0		0
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	66,345	44,357	44,357
Loans and leases greater than 90 days and accruing	0		45
Non-PCI Loans | Consumer Portfolio Segment | 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 Portfolio Segment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			2,943
Loans and leases greater than 90 days and accruing			$ 2,152
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	22,236	22,411
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	3,166	2,145
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	823	798
Loans and leases greater than 90 days and accruing	1,195
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	54,939	53,771
Loans and leases greater than 90 days and accruing	355
PCD Loans | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 24,900	$ 47,000