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Employee Benefit Plans (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2017 shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Stock options available to be awarded (in shares) | 560,000
Employee Stock Option |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Incentive stock options and SARs exercisable period | 10 years
Performance Shares |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Award vesting rights percentage | 33.33%
Maximum |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Common stock issued upon the exercise of stock options, SARs and stock awards (in shares) | 750,000
Share-based Compensation Award, Tranche One | Performance Shares |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Median return on average assets of all FDIC insured depository institutions time period | 20 years
Share-based Compensation Award, Tranche Two | Performance Shares |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Median return on average assets of all FDIC insured depository institutions time period | 20 years
Share-based Compensation Award, Tranche Three | Performance Shares |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Median return on average assets of all FDIC insured depository institutions time period | 20 years

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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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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