FDIC-Assisted Acquired Loans (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Jun. 09, 2017	Apr. 26, 2016	Jun. 20, 2014
Business Acquisition [Line Items]
Goodwill recorded on acquisition date	$ 5,923,000	$ 6,081,000
Team Bank
Business Acquisition [Line Items]
Gross loans receivable	3,357,000	3,613,000
Balance of accretable discount due to change in expected losses	(32,000)	(65,000)
Net carrying value of loans receivable	3,325,000	3,548,000
Goodwill recorded on acquisition date				$ 0
Vantus Bank
Business Acquisition [Line Items]
Gross loans receivable	4,966,000	5,304,000
Balance of accretable discount due to change in expected losses	(9,000)	(19,000)
Net carrying value of loans receivable	4,957,000	5,285,000
Goodwill recorded on acquisition date				0
Sun Security Bank
Business Acquisition [Line Items]
Gross loans receivable	8,862,000	9,405,000
Balance of accretable discount due to change in expected losses	(32,000)	(63,000)
Net carrying value of loans receivable	8,830,000	9,342,000
Goodwill recorded on acquisition date				$ 0
Inter Bank
Business Acquisition [Line Items]
Gross loans receivable	30,797,000	32,645,000
Balance of accretable discount due to change in expected losses	(20,000)	(58,000)
Net carrying value of loans receivable	30,777,000	32,587,000
Goodwill recorded on acquisition date			$ 0
Valley Bank
Business Acquisition [Line Items]
Gross loans receivable	22,476,000	23,632,000
Balance of accretable discount due to change in expected losses	(111,000)	(224,000)
Net carrying value of loans receivable	$ 22,365,000	$ 23,408,000
Goodwill recorded on acquisition date					$ 0