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Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 156,130 | $ 164,561 |
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 2,190,000 |  |
Loans held for sale | 45,505 | 51,179 |
Proceeds from sale of all loans | 618,140 | 823,457 |
Proceeds from sale of portfolio loans | 9,591 | 162,649 | $ 77,665
Proceeds from sale of loans held for sale | 608,549 | 660,808 | 797,123
Loans and Leases Receivable, Collateral for Secured Borrowings | 6,360,000 | 6,080,000 |
Advances from Federal Home Loan Banks | 175,200 | 835,200 |
Federal Home Loan Bank Advances, Current Borrowing Capacity | 6,180,000 | 5,240,000 |
Noncovered loans pledged to secure debt obligations | 9,120,000 | 8,750,000 |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 55,600 |  |
Gain (Loss) on Sale of Loans and Leases | 0 | 1,007 | $ 3,758
Net deferred fees on non-PCI loans | 100 | 1,700 |
Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Accretion Income | 12,800 | 13,600 |
PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,220 | 18,435 |
Nonaccruing | 1,300 | 624 |
Loans on the Cost Recovery Method | PCI Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Carrying value of acquired impaired loans | 3,300 | 1,100 |
Capital Commerce Bancorp |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 3,100 |  |
HomeBancorp Inc. |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 6,300 |  |
Guaranty Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 10,800 | 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 | 1,400 | 2,700 |
Bancorporation |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 12,000 | 18,100 |
Medical and Dental |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans in the medical, dental or related field | $ 4,980,000 | $ 4,860,000 |
Medical, dental or related fields percentage of total loans and leases | 19.50% | 20.60% |
Federal Reserve Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans and Leases Receivable, Collateral for Secured Borrowings |  | $ 2,080,000 |
Loans Pledged as Collateral | $ 2,940,000 | $ 2,770,000 |

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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 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 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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