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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Estimated fair value, less than 12 months	$ 228,406	$ 68,938
Estimated fair value, 12 months or more	40,516	42,568
Estimated fair value, total	268,922	111,506
Unrealized losses, less than 12 months	3,385	499
Unrealized losses, 12 months or more	1,904	884
Unrealized losses, total	5,289	1,383
State and Political Subdivisions [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	156,545	34,755
Estimated fair value, 12 months or more	30,194	31,251
Estimated fair value, total	186,739	66,006
Unrealized losses, less than 12 months	2,140	123
Unrealized losses, 12 months or more	1,301	538
Unrealized losses, total	3,441	661
U.S. government agencies [Member]
Investment [Line Items]
Estimated fair value, less than 12 months	71,861	34,183
Estimated fair value, 12 months or more	10,322	11,317
Estimated fair value, total	82,183	45,500
Unrealized losses, less than 12 months	1,245	376
Unrealized losses, 12 months or more	603	346
Unrealized losses, total	$ 1,848	$ 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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