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Subsequent Event (Details) - Whitney Bank [Member] $ in Millions | Dec. 30, 2016 USD ($) item | Jan. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Subsequent Event [Line Items] |  |  |
Number of branch locations | item | 9 |  |
Acquisition, Premium amount to pay |  |  | $ 44
Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Acquisition, assets assumed | $ 1,300 |  |
Transaction And Savings Deposits [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Acquisition, liabilities assumed | 500 |  |
Subsequent Event [Member] | Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Acquisition, assets assumed |  | $ 260 |
FHLB Borrowings [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Acquisition, debt assumed | $ 600 |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Premium To Pay + References No definition available. + Details
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- Definition Number Of Branch Locations Acquired + References No definition available. + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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