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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Estimated fair value, less than 12 months	$ 122,486	$ 153,056
Estimated fair value, 12 months or more
Estimated fair value, total	122,486	153,056
Unrealized losses, less than 12 months	2,940	3,731
Unrealized losses, 12 months or more
Unrealized losses, total	2,940	3,731
State and Political Subdivisions [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	110,100	140,384
Estimated fair value, 12 months or more
Estimated fair value, total	110,100	140,384
Unrealized losses, less than 12 months	2,539	3,328
Unrealized losses, 12 months or more
Unrealized losses, total	2,539	3,328
U.S. government agencies [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	12,386	12,672
Estimated fair value, 12 months or more
Estimated fair value, total	12,386	12,672
Unrealized losses, less than 12 months	401	403
Unrealized losses, 12 months or more
Unrealized losses, total	401	403
Certificates of Deposit [Member]
Investment [Line Items]
Estimated fair value, less than 12 months
Estimated fair value, 12 months or more
Estimated fair value, total
Unrealized losses, less than 12 months
Unrealized losses, 12 months or more
Unrealized losses, total

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

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-Publisher FASB
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

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-Publisher FASB
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+ References

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