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Securities - Held-to-Maturity Securities Held by Company (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Transfer of securities from held-to-maturity to available-for-sale		$ 138,206	$ 0	$ 0
Amortized Cost			140,579
Gross Unrealized Gains			20
Gross Unrealized Losses			1,222
Fair Value		$ 0	139,377
Obligations of U.S. Government sponsored entities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost			131,306
Gross Unrealized Gains			0
Gross Unrealized Losses			1,198
Fair Value			130,108
Obligations of U.S. states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost			9,273
Gross Unrealized Gains			20
Gross Unrealized Losses			24
Fair Value			$ 9,269
ASU 2019-04
Schedule of Held-to-maturity Securities [Line Items]
Transfer of securities from held-to-maturity to available-for-sale	$ 138,200

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- Definition

Transfer Of Securities From Held-To-Maturity To Available-For-Sale

+ References

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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).

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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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