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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
PCI loans | $ 1,044,064 | $ 1,044,064 | $ 1,186,498 | $ 996,280 | $ 1,029,426
Noncovered loans pledged to secure debt obligations | $ 3,690,000 | 3,690,000 | 3,160,000 |  |
Threshold period past due for write-off of Business credit card loans (days) | 120 days |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 2,590,000 | 2,590,000 | 2,200,000 |  |
Advances from Federal Home Loan Banks | 520,300 | 520,300 | 240,300 |  |
Federal Home Loan Bank Advances, Current Borrowing Capacity | 2,070,000 | 2,070,000 | 1,960,000 |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 296,500 | 296,500 | 485,300 |  |
Non-PCI Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Nonaccruing | 87,276 | 87,276 | 44,005 |  |
Accretion Income | 4,500 | 15,600 |  |  |
PCI Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Nonaccruing | 5,329 | 5,329 | 33,422 |  |
PCI loans | 1,044,064 | 1,044,064 | 1,186,498 |  |
Bancorporation |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 45,100 | 45,100 | $ 61,200 |  |
Sun American Bank |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
PCI loans | 29,900 | 29,900 |  |  |
Williamsburg First National Bank |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | $ 7,000 | $ 7,000 |  |  |

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 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://www.xbrl.org/2003/role/presentationRef -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 recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of loans which are owned but transferred to serve as collateral for the payment of other debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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