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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 260,077	$ 256,567	$ 244,123
Unrealized Gains	1,678	4,499	4,393
Unrealized Losses	(5,439)	(1,411)	(2,278)
Fair Value (Estimated)	256,316	259,655	246,238
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,155	11,155	11,152
Unrealized Gains	0	0	0
Unrealized Losses	(584)	(180)	(181)
Fair Value (Estimated)	10,571	10,975	10,971
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	20,585	23,284	27,224
Unrealized Gains	404	568	820
Unrealized Losses	(365)	(128)	(41)
Fair Value (Estimated)	20,624	23,724	28,003
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	224,037	217,828	201,447
Unrealized Gains	1,274	3,931	3,573
Unrealized Losses	(4,490)	(1,103)	(2,056)
Fair Value (Estimated)	220,821	220,656	202,964
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
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