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Fair Value of Financial Instruments - Schedule of Quantitative Information About Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Fair Value, Inputs, Level 3 | Nonrecurring measurements | Impaired loans, net
Weighted Average	5.00%
Fair Value, Inputs, Level 3 | Nonrecurring measurements | Other real estate owned
Weighted Average	12.00%
Fair Value, Measurements, Nonrecurring
Fair value at December 31, 2015	$ 1,075	$ 10,875
Fair Value, Measurements, Nonrecurring | Other real estate owned
Fair value at December 31, 2015	80	1,804
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair value at December 31, 2015	1,075	10,875
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Other real estate owned
Fair value at December 31, 2015	80	$ 1,804
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Nonrecurring measurements | Impaired loans, net
Fair value at December 31, 2015	995
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Nonrecurring measurements | Other real estate owned
Fair value at December 31, 2015	$ 80
Fair Value, Measurements, Nonrecurring | Minimum | Impaired loans, net
Weighted Average		0.00%
Fair Value, Measurements, Nonrecurring | Minimum | Foreclosed real estate
Weighted Average		8.00%
Fair Value, Measurements, Nonrecurring | Maximum | Impaired loans, net
Weighted Average		28.00%
Fair Value, Measurements, Nonrecurring | Maximum | Foreclosed real estate
Weighted Average		15.00%
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Measurements, Nonrecurring | Minimum | Impaired loans, net
Weighted Average		0.00%
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Measurements, Nonrecurring | Maximum | Impaired loans, net
Weighted Average		3.00%

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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