Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	17	13
Pre-Modification Outstanding Recorded Investment	$ 63,220	$ 45,092
Post-Modification Outstanding Recorded Investment	$ 63,220	$ 45,092
Total Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	14	10
Pre-Modification Outstanding Recorded Investment	$ 61,391	$ 39,315
Post-Modification Outstanding Recorded Investment	$ 61,391	$ 39,315
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	2
Pre-Modification Outstanding Recorded Investment	$ 1,564	$ 5,527
Post-Modification Outstanding Recorded Investment	$ 1,564	$ 5,527
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1
Pre-Modification Outstanding Recorded Investment	$ 43
Post-Modification Outstanding Recorded Investment	$ 43
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		1
Pre-Modification Outstanding Recorded Investment		$ 250
Post-Modification Outstanding Recorded Investment		$ 250
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1
Pre-Modification Outstanding Recorded Investment	$ 222
Post-Modification Outstanding Recorded Investment	$ 222
Total Commercial And Industrial [Member] \| Total Commercial [Member] \| Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	13	9
Pre-Modification Outstanding Recorded Investment	$ 55,482	$ 38,659
Post-Modification Outstanding Recorded Investment	$ 55,482	$ 38,659
Total Commercial And Industrial [Member] \| Total Commercial [Member] \| Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 5,909	$ 656
Post-Modification Outstanding Recorded Investment	$ 5,909	$ 656

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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

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