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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 164,561 | $ 150,916 |
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 2,080,000 |  |
Loans held for sale | 51,179 | 74,401 |
Proceeds from sale of all loans | 823,457 | 874,788 |
Proceeds from sale of portfolio loans | 162,649 | 77,665 | $ 45,862
Proceeds from sale of loans held for sale | 660,808 | 797,123 | 701,412
Loans and Leases Receivable, Collateral for Secured Borrowings | 6,080,000 | 5,500,000 |
Advances from Federal Home Loan Banks | 835,200 | 660,200 |
Federal Home Loan Bank Advances, Current Borrowing Capacity | 5,240,000 | 4,840,000 |
Noncovered loans pledged to secure debt obligations | $ 8,750,000 | 8,260,000 |
Charge off of past due business credit card loans (days) | 120 days |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | $ 67,800 | 84,800 |
Gain (Loss) on Sale of Loans and Leases | 1,007 | 3,758 | $ 0
Net deferred fees on non-PCI loans | 1,700 | 6,700 |
Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Accretion Income | 13,600 | 14,300 |
PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,435 | 26,369 |
Nonaccruing | 624 | 3,451 |
Loans on the Cost Recovery Method | PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Carrying value of acquired impaired loans | 300 | 500 |
Guaranty Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 14,200 |  |
Cordia Bancorp Inc. |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 2,700 | 4,200 |
Bancorporation |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 18,100 | 27,400 |
Medical and Dental |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans in the medical, dental or related field | $ 4,860,000 | $ 4,660,000 |
Medical, dental or related fields percentage of total loans and leases | 20.60% | 21.50% |
Federal Reserve Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Pledged as Collateral | $ 2,770,000 | $ 0 |

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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 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 Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining + References No definition available. + Details
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- Definition Amount of the collateral pledged in support of Federal Reserve Bank advances. + 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 Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + 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 and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + 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=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + 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=66007379&loc=d3e113888-111728 + Details
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- Definition The cash inflow from Sales of Loans Held For Investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3337-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82926135&loc=d3e60097-112785 + Details
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