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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans held for sale | $ 124,800 | $ 67,900 |
Proceeds from Sale of Loans Receivable | 1,050,000 | 756,000 |
Gain on sale of mortgage loans |  | 300 |
Net deferred fees on non-PCI loans | 50,200 | 900 |
Nonaccruing | 191,483 |  | $ 168,717
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 19,500 | 30,900 |
Loans and leases greater than 90 days and accruing | 5,862 |  |
SBA-PPP |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Net deferred fees on non-PCI loans | 41,100 |  |
Loans Held For Sale |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Proceeds from Sale of Loans Receivable |  | 731,800 |
Portfolio Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Proceeds from Sale of Loans Receivable | 7,600 | 24,200 |
Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccruing |  | 114,946 |
Loans and leases greater than 90 days and accruing |  | 3,291 |
Non-PCI Loans | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccruing | 43,322 | 42,407 | 42,407
Loans and leases greater than 90 days and accruing | 4,312 | 1,094 |
PCD Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccruing | 54,939 |  | $ 53,771
Loans and leases greater than 90 days and accruing | 355 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status, Remaining Discount | 45,300 | 88,200 |
Medical and Dental |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans in the medical, dental or related field | $ 5,540,000 | $ 5,160,000 |
Medical, dental or related fields percentage of total loans and leases | 16.90% | 17.90% |
Federal Home Loan Bank of Atlanta |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Pledged as Collateral | $ 12,157,153 | $ 9,407,688 |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 8,637,844 | 6,574,636 |
Advances from Federal Home Loan Banks | 652,675 | 563,690 |
Federal Home Loan Bank Advances, Current Borrowing Capacity | 7,985,169 | 6,010,946 |
Federal Reserve Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Pledged as Collateral | 4,104,866 | 3,684,919 |
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 3,321,762 | 2,981,712 |
Federal Reserve Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds | $ 3,321,762 | $ 2,981,712 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21310-158488 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21286-158488 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337389&loc=d3e21493-158490 + Details
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