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Securities, Available for Sale Table of Available-for-sale Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year	$ 26,651	$ 26,651	$ 115,322
Gross Unrealized Losses, Less Than or Equal to One Year	$ (83)	$ (83)	$ (1,060)
Number of Securities, Less Than or Equal to One Year	212	212	519
Fair Value, More Than One Year	$ 138	$ 138	$ 667
Gross Unrealized Losses, More Than One Year	$ (5)	$ (5)	$ (31)
Number of Securities, More Than One Year	13	13	8
Other than temporary impairment loss	$ 0	$ 0
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year	526	526	$ 35,588
Gross Unrealized Losses, Less Than or Equal to One Year	$ (1)	$ (1)	$ (221)
Number of Securities, Less Than or Equal to One Year	13	13	146
Fair Value, More Than One Year	$ 33	$ 33	$ 0
Gross Unrealized Losses, More Than One Year	$ (1)	$ (1)	$ 0
Number of Securities, More Than One Year	7	7	0
Obligations of states and political subdivisions
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year	$ 14,962	$ 14,962	$ 18,500
Gross Unrealized Losses, Less Than or Equal to One Year	$ (48)	$ (48)	$ (59)
Number of Securities, Less Than or Equal to One Year	60	60	45
Fair Value, More Than One Year	$ 0	$ 0	$ 400
Gross Unrealized Losses, More Than One Year	$ 0	$ 0	$ (14)
Number of Securities, More Than One Year	0	0	2
Corporate securities
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year	$ 11,163	$ 11,163	$ 56,373
Gross Unrealized Losses, Less Than or Equal to One Year	$ (34)	$ (34)	$ (634)
Number of Securities, Less Than or Equal to One Year	139	139	302
Fair Value, More Than One Year	$ 86	$ 86	$ 267
Gross Unrealized Losses, More Than One Year	$ (2)	$ (2)	$ (17)
Number of Securities, More Than One Year	4	4	6
Equity securities
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year	$ 0	$ 0	$ 1,998
Gross Unrealized Losses, Less Than or Equal to One Year	$ 0	$ 0	$ (79)
Number of Securities, Less Than or Equal to One Year	0	0	8
Fair Value, More Than One Year	$ 19	$ 19	$ 0
Gross Unrealized Losses, More Than One Year	$ (2)	$ (2)	$ 0
Number of Securities, More Than One Year	2	2	0
Obligations of foreign governments
Gross Unrealized Losses:
Fair Value, Less Than or Equal to One Year			$ 2,863
Gross Unrealized Losses, Less Than or Equal to One Year			$ (67)
Number of Securities, Less Than or Equal to One Year			18
Fair Value, More Than One Year			$ 0
Gross Unrealized Losses, More Than One Year			$ 0
Number of Securities, More Than One Year			0

X

- Definition

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 that have been in a continuous loss position for less than twelve months.

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