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FDIC-Acquired Loans and Loss Sharing Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 09, 2017	Apr. 26, 2016	Jun. 20, 2014
Business Acquisition [Line Items]
Goodwill recorded on acquisition date	$ 6,944,000	$ 8,098,000
TeamBank
Business Acquisition [Line Items]
Gross loans receivable	5,393,000	7,304,000
Balance of accretable discount due to change in expected losses	(97,000)	(159,000)
Net carrying value of loans receivable	(5,266,000)	(7,118,000)
Expected loss remaining	30,000	27,000
Goodwill recorded on acquisition date				$ 0
Vantus Bank
Business Acquisition [Line Items]
Gross loans receivable	8,052,000	9,899,000
Balance of accretable discount due to change in expected losses	(35,000)	(89,000)
Net carrying value of loans receivable	(8,004,000)	(9,797,000)
Expected loss remaining	13,000	13,000
Goodwill recorded on acquisition date				0
Sun Security Bank
Business Acquisition [Line Items]
Gross loans receivable	13,395,000	17,906,000
Balance of accretable discount due to change in expected losses	(180,000)	(374,000)
Net carrying value of loans receivable	(13,111,000)	(17,392,000)
Expected loss remaining	104,000	140,000
Goodwill recorded on acquisition date				$ 0
InterBank
Business Acquisition [Line Items]
Gross loans receivable	44,215,000	60,430,000
Balance of accretable discount due to change in expected losses	(1,079,000)	(5,143,000)
Net carrying value of loans receivable	(42,057,000)	(54,442,000)
Expected loss remaining	1,079,000	845,000
Goodwill recorded on acquisition date			$ 0
Valley Bank
Business Acquisition [Line Items]
Gross loans receivable	31,515,000	41,032,000
Balance of accretable discount due to change in expected losses	(612,000)	(1,803,000)
Net carrying value of loans receivable	(30,204,000)	(38,452,000)
Expected loss remaining	$ 699,000	$ 777,000
Goodwill recorded on acquisition date					$ 0

X

- Definition

Represents the monetary amount of FDIC Indemnification Asset Net Carrying Value to Loans Receivable, as of the indicated date.

+ References

No definition available.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

+ References

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- Definition

Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

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Amount of increases to the indemnification asset due to additional estimated losses assumed by the Federal Deposit Insurance Corporation (FDIC), relating to loss sharing agreements with the FDIC.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

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-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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