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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 242,679	$ 226,828	$ 188,770
Unrealized Gains	4,371	2,973	7,231
Unrealized Losses	(2,029)	(4,264)	(204)
Fair Value (Estimated)	245,021	225,537	195,797
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,154	11,943	891
Unrealized Gains	0	35	15
Unrealized Losses	(197)	(233)	0
Fair Value (Estimated)	10,957	11,745	906
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	24,993	31,201	34,186
Unrealized Gains	731	967	1,386
Unrealized Losses	(40)	(147)	(34)
Fair Value (Estimated)	25,684	32,021	35,538
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	202,232	179,384	149,393
Unrealized Gains	3,640	1,971	5,830
Unrealized Losses	(1,792)	(3,884)	(170)
Fair Value (Estimated)	204,080	177,471	155,053
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,300	4,300	4,300
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 4,300	$ 4,300	$ 4,300

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=82897076&loc=d3e27232-111563

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+ 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=82897076&loc=d3e27232-111563

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+ 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 (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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