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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities held-to-maturity:
Amortized Cost	$ 341,383	$ 324,010
Gross Unrealized Gains	666	536
Gross Unrealized Losses	(5,259)	(5,798)
Estimated Fair Value	336,790	318,748
Agency mortgage-backed securities
Securities held-to-maturity:
Amortized Cost	251,162	233,409
Gross Unrealized Gains	27	15
Gross Unrealized Losses	(3,302)	(3,554)
Estimated Fair Value	247,887	229,870
Municipals - exempt from Federal tax
Securities held-to-maturity:
Amortized Cost	90,221	90,601
Gross Unrealized Gains	639	521
Gross Unrealized Losses	(1,957)	(2,244)
Estimated Fair Value	$ 88,903	$ 88,878

X

- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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-Name Accounting Standards Codification
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