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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Apr. 02, 2019 | Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | $ 32,200 |  | $ 32,200 |  |  | $ 33,300
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 6,540,000 |  | 6,540,000 |  |  | 6,360,000
Advances from Federal Home Loan Banks |  |  |  |  |  | 175,200
Federal Home Loan Bank Advances, Current Borrowing Capacity | 6,350,000 |  | 6,350,000 |  |  | 6,180,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | 200 |  | 200 |  |  | 100
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 47,300 |  | 47,300 |  |  |
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 2,780,000 |  | 2,780,000 |  |  | 2,190,000
Reclassification of portfolio loans to (from) loans held for sale |  |  | (23,900) |  |  |
Loans held for sale | 83,256 |  | 83,256 |  |  | 45,505
Proceeds from sales of portfolio loans |  |  | 24,247 | $ 0 |  |
Accretion | 16,200 | $ 13,500 | 45,891 | 45,699 |  |
Goodwill recorded for First South Bancorp | 296,764 |  | 296,764 |  |  | 236,347
Non-PCI Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Nonaccruing | 108,816 |  | 108,816 |  |  | 84,546
Remaining discount | 85,000 |  | 85,000 |  |  | 95,500
Accretion Income | 3,500 | $ 2,900 | 10,000 | $ 9,900 |  |
PCI Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Nonaccruing | 800 |  | 800 |  |  | 1,300
Biscayne Bancshares |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Assets |  |  |  |  | $ 1,029,184 |
Intangible assets |  |  |  |  | 4,745 |
Liabilities assumed |  |  |  |  | 956,756 |
Deposits |  |  |  |  | 786,512 |
Goodwill recorded for First South Bancorp |  |  |  |  | $ 46,521 |
Biscayne Bancshares | Non-PCI Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans acquired | 850,352 |  | 850,352 |  |  |
Biscayne Bancshares | PCI Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans acquired | 13,032 |  | 13,032 |  |  |
Federal Home Loan Bank of Atlanta |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Advances from Federal Home Loan Banks | 181,700 |  | 181,700 |  |  |
Loans Pledged as Collateral | 9,330,000 |  | 9,330,000 |  |  | 9,120,000
Federal Reserve Bank |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | $ 3,470,000 |  | $ 3,470,000 |  |  | $ 2,940,000

X
- Definition Current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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