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Investments (Schedule of Available-for-sale Securities Reconciliation) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 519,744	$ 503,152
Gross Unrealized Gains	9,490	6,610
Gross Unrealized Losses	(695)	(2,180)
Estimated Fair Value	528,539	507,582
US Government agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,466	28,801
Gross Unrealized Gains	409	303
Gross Unrealized Losses	(3)	(62)
Estimated Fair Value	24,872	29,042
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	391,345	374,683
Gross Unrealized Gains	3,951	2,440
Gross Unrealized Losses	(682)	(2,062)
Estimated Fair Value	394,614	375,061
State and poltical subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	103,433	99,093
Gross Unrealized Gains	4,503	3,146
Gross Unrealized Losses	(10)	(56)
Estimated Fair Value	107,926	102,183
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500	575
Gross Unrealized Gains	627	721
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 1,127	$ 1,296

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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+ References

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+ References

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-Publisher FASB
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