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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 298,786	$ 255,663	$ 257,395
Unrealized Gains	7,925	1,382	965
Unrealized Losses	(64)	(6,145)	(8,470)
Fair Value (Estimated)	306,647	250,900	249,890
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	32,840	11,155	11,155
Unrealized Gains	93	0	0
Unrealized Losses	0	(472)	(767)
Fair Value (Estimated)	32,933	10,683	10,388
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	15,584	18,250	19,244
Unrealized Gains	502	336	326
Unrealized Losses	(16)	(255)	(460)
Fair Value (Estimated)	16,070	18,331	19,110
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	236,612	221,958	222,696
Unrealized Gains	7,136	1,046	639
Unrealized Losses	(48)	(5,418)	(7,243)
Fair Value (Estimated)	243,700	217,586	216,092
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	13,750	4,300	4,300
Unrealized Gains	194	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 13,944	$ 4,300	$ 4,300

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- 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=118939692&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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