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Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments - Assets	$ 0	$ 146
Derivative financial instruments - Liabilities	487	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments - Assets		146
Cash surrender value of life insurance policies - deferred compensation plan	30,351	36,269
Derivative financial instruments - Liabilities	487
Fair Value, Measurements, Recurring | Deferred compensation plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	26,797	30,307
Fair Value, Measurements, Recurring | Marketable securities - other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - other	113	3,692
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments - Assets		0
Cash surrender value of life insurance policies - deferred compensation plan	0	0
Derivative financial instruments - Liabilities	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Deferred compensation plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Marketable securities - other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - other	113	3,692
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments - Assets		146
Cash surrender value of life insurance policies - deferred compensation plan	30,351	36,269
Derivative financial instruments - Liabilities	487
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Deferred compensation plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	26,797	30,307
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable securities - other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - other	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments - Assets		0
Cash surrender value of life insurance policies - deferred compensation plan	0	0
Derivative financial instruments - Liabilities	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Deferred compensation plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable securities - other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - other	$ 0	$ 0

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
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- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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