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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 341,592	$ 281,606	$ 281,219
Unrealized Gains	8,008	5,590	3,582
Unrealized Losses	(352)	(151)	(2,233)
Fair Value (Estimated)	349,248	287,045	282,568
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	35,981	32,840	31,155
Unrealized Gains	207	47	48
Unrealized Losses	0	(26)	(280)
Fair Value (Estimated)	36,188	32,861	30,923
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	51,142	14,431	17,560
Unrealized Gains	1,392	450	372
Unrealized Losses	(7)	(16)	(146)
Fair Value (Estimated)	52,527	14,865	17,786
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	239,719	219,585	225,204
Unrealized Gains	5,819	4,936	3,162
Unrealized Losses	(345)	(109)	(1,801)
Fair Value (Estimated)	245,193	224,412	226,565
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	14,750	14,750	7,300
Unrealized Gains	590	157	0
Unrealized Losses	0	0	(6)
Fair Value (Estimated)	$ 15,340	$ 14,907	$ 7,294

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

+ References

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