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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Estimated fair value, less than 12 months	$ 257,650	$ 68,938
Estimated fair value, 12 months or more	63,112	42,568
Estimated fair value, total	320,762	111,506
Unrealized losses, less than 12 months	3,879	499
Unrealized losses, 12 months or more	3,149	884
Unrealized losses, total	7,028	1,383
State and Political Subdivisions [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	178,137	34,755
Estimated fair value, 12 months or more	36,804	31,251
Estimated fair value, total	214,941	66,006
Unrealized losses, less than 12 months	2,905	123
Unrealized losses, 12 months or more	1,786	538
Unrealized losses, total	4,691	661
U.S. government agencies [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	79,513	34,183
Estimated fair value, 12 months or more	26,308	11,317
Estimated fair value, total	105,821	45,500
Unrealized losses, less than 12 months	974	376
Unrealized losses, 12 months or more	1,363	346
Unrealized losses, total	$ 2,337	$ 722

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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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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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.

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