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Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 56 | 78 | 47
Pre-Modification Outstanding Recorded Investment | $ 94,760 | $ 177,070 | $ 132,234
Post-Modification Outstanding Recorded Investment | $ 94,760 | $ 177,070 | $ 132,234
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 5 | 1
Pre-Modification Outstanding Recorded Investment | $ 1,564 | $ 5,625 | $ 2,943
Post-Modification Outstanding Recorded Investment | $ 1,564 | $ 5,625 | $ 2,943
Residential Mortgages [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 14 | 15 | 7
Pre-Modification Outstanding Recorded Investment | $ 1,297 | $ 2,812 | $ 694
Post-Modification Outstanding Recorded Investment | $ 1,297 | $ 2,812 | $ 694
Consumer [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 10 | 1 |
Pre-Modification Outstanding Recorded Investment | $ 455 | $ 40 |
Post-Modification Outstanding Recorded Investment | $ 455 | $ 40 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 31 | 57 | 39
Pre-Modification Outstanding Recorded Investment | $ 91,444 | $ 168,593 | $ 128,597
Post-Modification Outstanding Recorded Investment | $ 91,444 | $ 168,593 | $ 128,597
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 29 | 52 | 38
Pre-Modification Outstanding Recorded Investment | $ 85,306 | $ 162,909 | $ 128,449
Post-Modification Outstanding Recorded Investment | $ 85,306 | $ 162,909 | $ 128,449
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 2 | 5 | 1
Pre-Modification Outstanding Recorded Investment | $ 6,138 | $ 5,684 | $ 148
Post-Modification Outstanding Recorded Investment | $ 6,138 | $ 5,684 | $ 148

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- Definition Number of 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 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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