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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 281,219	$ 255,663	$ 258,690
Unrealized Gains	3,582	1,382	1,966
Unrealized Losses	(2,233)	(6,145)	(4,805)
Fair Value (Estimated)	282,568	250,900	255,851
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	31,155	11,155	11,155
Unrealized Gains	48	0	0
Unrealized Losses	(280)	(472)	(515)
Fair Value (Estimated)	30,923	10,683	10,640
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	17,560	18,250	21,990
Unrealized Gains	372	336	469
Unrealized Losses	(146)	(255)	(289)
Fair Value (Estimated)	17,786	18,331	22,170
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	225,204	221,958	221,245
Unrealized Gains	3,162	1,046	1,497
Unrealized Losses	(1,801)	(5,418)	(4,001)
Fair Value (Estimated)	226,565	217,586	218,741
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7,300	4,300	4,300
Unrealized Gains	0	0	0
Unrealized Losses	(6)	0	0
Fair Value (Estimated)	$ 7,294	$ 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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