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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 257,395	$ 256,567	$ 242,679
Unrealized Gains	965	4,499	4,371
Unrealized Losses	(8,470)	(1,411)	(2,029)
Fair Value (Estimated)	249,890	259,655	245,021
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,155	11,155	11,154
Unrealized Gains	0	0	0
Unrealized Losses	(767)	(180)	(197)
Fair Value (Estimated)	10,388	10,975	10,957
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	19,244	23,284	24,993
Unrealized Gains	326	568	731
Unrealized Losses	(460)	(128)	(40)
Fair Value (Estimated)	19,110	23,724	25,684
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	222,696	217,828	202,232
Unrealized Gains	639	3,931	3,640
Unrealized Losses	(7,243)	(1,103)	(1,792)
Fair Value (Estimated)	216,092	220,656	204,080
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 unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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 investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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