Acquisitions - Additional information (Details) - USD ($)		3 Months Ended								12 Months Ended
	May 22, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Noninterest expense		$ 14,201,000	$ 13,528,000	$ 13,046,000	$ 13,272,000	$ 12,196,000	$ 12,667,000	$ 12,066,000	$ 10,963,000	$ 54,047,000	$ 54,452,000	$ 47,892,000
Goodwill		$ 14,089,000								14,089,000	14,089,000
Bargain purchase gain											$ 123,000
Diversified portfolio, loans										$ 801,600,000
Central Federal Bancshares
Value of all cash transaction	$ 21,900,000
Cash consideration	9,100,000
Acquisition related costs	1,200,000
Noninterest expense	1,200,000
Cash	21,900,000
Purchase price allocated to core deposit intangible	540,000
Goodwill	0
Bargain purchase gain	$ 123,000
Core Deposit Intangible Assets Amortization Period	6 years
Diversified portfolio, loans	$ 52,100,000
Fair value of portfolio	662,000
Purchased credit-impaired loans	$ 0