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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items] |  |
Loans held for sale | $ 98,700 | $ 124,800
Proceeds from Sale of Loans Receivable | 1,040,000 | 1,050,000
Nonaccruing | 120,306 | 191,483
Loans and leases greater than 90 days and accruing | 6,925 | 5,862
Financing Receivable, Recorded Investment, Nonaccrual Status, Remaining Discount | 40,436 | 64,727
Portfolio Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Proceeds from Sale of Loans Receivable |  | 7,600
Non-PCI Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status, Remaining Discount | 11,428 | 19,473
Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccruing | 35,287 | 43,322
Loans and leases greater than 90 days and accruing | 5,431 | 4,312
PCD Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccruing | 29,616 | 54,939
Loans and leases greater than 90 days and accruing | 543 | 355
Financing Receivable, Recorded Investment, Nonaccrual Status, Remaining Discount | 29,008 | 45,254
Non-PCD Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net deferred fees on non-PCI loans | 31,785 | 50,217
Non-PCD Loans | Other Portfolio |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net deferred fees on non-PCI loans | 16,903 | 9,153
Non-PCD Loans | SBA-PPP |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net deferred fees on non-PCI loans | 14,882 | 41,064
Customer Concentration Risk | Medical Dental And Related Field Borrowers | Loans Receivable To Borrowers In Medical, Dental Or Related Fields | Loans Receivable |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans in the medical, dental or related field | $ 7,090,000 | $ 5,540,000
Loan concentration percentage | 21.90% | 16.90%
Geographic Concentration Risk | Loans Receivable Secured By Real Estate Collateral | Loans Receivable | NORTH CAROLINA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loan concentration percentage |  | 35.90%
Geographic Concentration Risk | Loans Receivable Secured By Real Estate Collateral | Loans Receivable | SOUTH CAROLINA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loan concentration percentage |  | 15.60%
Federal Home Loan Bank of Atlanta |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Pledged as Collateral | $ 14,507,109 | $ 12,157,153
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 9,563,947 | 8,637,844
Advances from Federal Home Loan Banks | 644,659 | 652,675
Federal Home Loan Bank Advances, Current Borrowing Capacity | 8,919,288 | 7,985,169
Federal Reserve Bank |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Pledged as Collateral | 4,806,443 | 4,104,866
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 3,950,649 | 3,321,762
Advances from Federal Home Loan Banks | 0 | 0
Federal Home Loan Bank Advances, Current Borrowing Capacity | $ 3,950,649 | $ 3,321,762

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