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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 244,123	$ 226,828	$ 216,272
Unrealized Gains	4,393	2,973	8,952
Unrealized Losses	(2,278)	(4,264)	(24)
Fair Value (Estimated)	246,238	225,537	225,200
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,152	11,943	35,962
Unrealized Gains	0	35	31
Unrealized Losses	(181)	(233)	0
Fair Value (Estimated)	10,971	11,745	35,993
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	27,224	31,201	37,096
Unrealized Gains	820	967	1,651
Unrealized Losses	(41)	(147)	(24)
Fair Value (Estimated)	28,003	32,021	38,723
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	201,447	179,384	138,914
Unrealized Gains	3,573	1,971	7,270
Unrealized Losses	(2,056)	(3,884)	0
Fair Value (Estimated)	202,964	177,471	146,184
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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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=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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