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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 188,770	$ 240,023	$ 245,322
Unrealized Gains	7,231	5,545	4,797
Unrealized Losses	(204)	(2,445)	(1,775)
Fair Value (Estimated)	195,797	243,123	248,344
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	891	71,000	75,991
Unrealized Gains	15	40	22
Unrealized Losses	0	(2,284)	(1,571)
Fair Value (Estimated)	906	68,756	74,442
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	34,186	42,193	45,287
Unrealized Gains	1,386	1,305	1,744
Unrealized Losses	(34)	(136)	(53)
Fair Value (Estimated)	35,538	43,362	46,978
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	149,393	122,530	123,744
Unrealized Gains	5,830	4,200	3,031
Unrealized Losses	(170)	(25)	(151)
Fair Value (Estimated)	155,053	126,705	126,624
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,300	4,300	300
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 4,300	$ 4,300	$ 300

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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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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-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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-Name Accounting Standards Codification
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