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Restrictions on Subsidiary Dividends, Loans, or Advances (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2020	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Cost of shares repurchased				$ 7,716	$ 2,486	$ 2,173
Special dividend for general operating liquidity				32,000
Amount available for special dividend distribution with approval from SCBFI					157,000		$ 60,000
Maximum amount available for transfer in the form of loans or advances				479,500	246,400
Covid 19
Special dividend for general operating liquidity	$ 33,000
Announced stock repurchase program
Amount available for special dividend distribution without approval from SCBFI	24,700	$ 66,600				$ 66,600
Cost of shares repurchased	$ 24,700	$ 68,400	$ 68,400	$ 24,700	$ 156,900

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- Definition

Represents the maximum amount available in the form of loans or advances under regulatory requirements.

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- Definition

Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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- Definition

Amount of dividends that can be declared or paid with approval of regulatory agency.

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-Name Accounting Standards Codification
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-SubTopic 10
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Amount of dividends that can be declared or paid without approval of regulatory agency.

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-Topic 235
-SubTopic 10
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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