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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 240,829	$ 226,828	$ 236,611
Unrealized Gains	2,959	2,973	6,868
Unrealized Losses	(4,410)	(4,264)	(142)
Fair Value (Estimated)	239,378	225,537	243,337
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	12,050	11,943	68,009
Unrealized Gains	0	35	37
Unrealized Losses	(317)	(233)	(107)
Fair Value (Estimated)	11,733	11,745	67,939
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	29,093	31,201	39,828
Unrealized Gains	880	967	1,675
Unrealized Losses	(135)	(147)	(35)
Fair Value (Estimated)	29,838	32,021	41,468
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	195,386	179,384	124,474
Unrealized Gains	2,079	1,971	5,156
Unrealized Losses	(3,958)	(3,884)	0
Fair Value (Estimated)	193,507	177,471	129,630
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=73527792&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=73527792&loc=d3e27232-111563

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+ References

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-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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-Section 50
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