Quarterly Financial Data (Unaudited) - Summary of Quarterly Operating Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Interest income	$ 27,532	$ 27,100	$ 27,871	$ 26,972					$ 26,047	$ 25,186	$ 24,207	$ 22,042	$ 109,475	$ 107,052	$ 97,482
Interest expense	3,586	3,951	4,344	4,908					7,054	6,632	6,139	4,875	16,789	26,916	24,700
NET INTEREST INCOME	23,946	23,149	23,527	22,064					18,993	18,554	18,068	17,167	92,686	80,136	72,782
Provision for credit losses	(2,615)	(409)	1,000	1,000					545	491	314	682	(1,024)	6,002	2,032
Noninterest income	4,857	4,524	5,720	4,941					3,158	3,423	3,568	2,944	20,042	14,750	13,093
Noninterest expense	14,201	13,528	13,046	13,272					12,196	12,667	12,066	10,963	54,047	54,452	47,892
INCOME BEFORE INCOME TAXES	17,217	14,554	15,201	12,733					9,410	8,819	9,256	8,466	59,705	34,432	35,951
Income tax expense	3,529	3,096	3,153	2,747					1,854	1,725	1,802	1,666	12,525	6,887	7,047
NET INCOME	$ 13,688	$ 11,458	$ 12,048	$ 9,986					$ 7,556	$ 7,094	$ 7,454	$ 6,800	$ 47,180	$ 27,545	$ 28,904
Basic earnings per share	$ 1.53	$ 1.27	$ 1.33	$ 1.09					$ 0.81	$ 0.76	$ 0.82	$ 0.76	$ 5.22	$ 3.00	$ 3.14
Diluted earnings per share	$ 1.53	$ 1.27	$ 1.32	$ 1.09					$ 0.81	$ 0.76	$ 0.81	$ 0.76	$ 5.22	$ 2.99	$ 3.14
Quarterly Operating Data
Interest income					$ 27,264	$ 26,220	$ 26,646	$ 26,922
Interest expense					5,483	6,802	7,269	7,362
NET INTEREST INCOME					21,781	19,418	19,377	19,560
Provision for credit losses					1,868	2,850	388	896
Noninterest income					4,358	3,229	3,674	3,489
Noninterest expense					15,509	13,569	13,025	12,349
Income before income taxes					8,762	6,228	9,638	9,804
Income tax expense					$ 1,861	$ 1,129	$ 1,921	$ 1,976