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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 6,340,000 |  | $ 6,340,000 |  | $ 6,080,000
Advances from Federal Home Loan Banks | 264,700 |  | 264,700 |  | 835,200
Federal Home Loan Bank Advances, Current Borrowing Capacity | 6,080,000 |  | 6,080,000 |  | 5,240,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | 200 |  | 200 |  | 1,700
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 58,900 |  | 58,900 |  |
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 2,200,000 |  | 2,200,000 |  | 2,080,000
Loans held for sale | 46,082 |  | 46,082 |  | 51,179
Transfer of Portfolio Loans and Leases to Held-for-sale |  |  |  | $ 161,719 |
Proceeds From Sales of Loans | 165,939 | $ 307,418 | 468,705 | 649,503 |
Proceeds from sales of portfolio loans |  |  | 0 | 162,486 |
Gain (Loss) on sale of loans and leases |  |  | 0 | 1,007 |
Non-PCI Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Nonaccruing | 85,419 |  | 85,419 |  | 92,534
Accretion Income | 2,900 | 4,200 | 9,900 | 10,200 |
PCI Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Nonaccruing | 1,500 |  | 1,500 |  | 600
Accretion Income | 13,500 | $ 19,200 | 45,700 | $ 59,000 |
HomeBancorp Inc. |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 6,700 |  | 6,700 |  |
Guaranty Bank |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 11,400 |  | 11,400 |  | 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 | 1,500 |  | 1,500 |  | 2,700
Bancorporation |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 13,300 |  | 13,300 |  | 18,100
Federal Home Loan Bank of Atlanta |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans Pledged as Collateral | 9,070,000 |  | 9,070,000 |  | 8,750,000
Federal Reserve Bank |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans Pledged as Collateral | $ 2,910,000 |  | $ 2,910,000 |  | $ 2,770,000

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 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://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 Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 cash inflow from Sales of Loans Held For Investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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