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Employee Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Incentive stock options and SARs exercisable period | 10 years |  |
Stock awards available to be awarded | 559,815 |  |
Total expense associated with the retirement benefit plan | $ 800,000 | $ 800,000 | $ 700,000
Number of shares of the Company's common stock held by the 401(k) | 228,662 | 238,647 |
Contributions by employer | $ 0 | $ 0 |
Executive officers accrued benefit liability | 2,000,000 | 2,000,000 |
Deferred compensation agreement costs | 300,000 | 300,000 | $ 200,000
Deferred compensation agreement liabilities | 5,700,000 | 6,200,000 |
Cash surrender value of company owned life insurance | $ 7,000,000 | $ 8,200,000 |
Performance Shares [Member] |  |  |
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 | 750,000 |  |
Horizon Defined Benefit Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Overall investment return goal above stated indices | 0.50% |  |
Moving average basis | 5 years |  |
Maximum percent of plan assets in any one security | 15.00% |  |
Maximum percent of plan assets in any on industry | 25.00% |  |
Contributions by employer | $ 0 |  |
Anticipated next year plan contributions | $ 0 |  |
Community Defined Benefit Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Defined benefit plan, allocation allowance | 5.00% |  |
Contributions by employer | $ 0 |  |
Anticipated next year plan contributions | $ 1,700,000 |  |
Community Defined Benefit Plan | Maximum |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Moving average basis | 5 years |  |
Community Defined Benefit Plan | Minimum |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Moving average basis | 3 years |  |
Pentegra Defined Benefit Plan for Financial Institutions |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Funded percentage | 98.87% |  |
Share-based Compensation Award, Tranche One | Performance Shares [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Mean return on average assets of CHCO time period | 3 years |  |
Median return on average assets of all FDIC insured depository institutions time period | 20 years |  |
Share-based Compensation Award, Tranche Two | Performance Shares [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Mean return on average assets of CHCO time period | 4 years |  |
Median return on average assets of all FDIC insured depository institutions time period | 20 years |  |
Share-based Compensation Award, Tranche Three | Performance Shares [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Mean return on average assets of CHCO time period | 5 years |  |
Median return on average assets of all FDIC insured depository institutions time period | 20 years |  |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 + Details
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