Condensed Parent Company Only Financial Statements - Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
NET INCOME	$ 13,688	$ 11,458	$ 12,048	$ 9,986	$ 7,556	$ 7,094	$ 7,454	$ 6,800	$ 47,180	$ 27,545	$ 28,904
NET CASH PROVIDED BY OPERATING ACTIVITIES									51,762	40,301	38,601
NET CASH USED IN INVESTING ACTIVITIES									(101,918)	(272,360)	(112,992)
Dividends on common stock									5,598	5,513	4,763
Exercise of stock options										64
NET CASH PROVIDED BY FINANCING ACTIVITIES									119,503	250,904	83,465
Increase in cash and cash equivalents									69,347	18,845	9,074
Cash and cash equivalents at beginning of period				54,245				26,326	54,245	35,400	26,326
Cash and cash equivalents at end of period	123,592				35,400				123,592	54,245	35,400
Parent Company
NET INCOME									47,180	27,545	28,904
Equity in undistributed income of the Bank									(36,065)	4,469	(7,427)
Other adjustments, net									(559)	(904)	(635)
NET CASH PROVIDED BY OPERATING ACTIVITIES									10,556	31,110	20,842
Investments in Bank subsidiaries										(20,463)	(10,747)
NET CASH USED IN INVESTING ACTIVITIES										(20,463)	(10,747)
Dividends on common stock									(5,598)	(5,513)	(4,763)
Exercise of stock options										64
Payments to acquire treasury stock									(8,341)	(5,771)	(1,166)
Repayments of long term debt										(3,000)	(4,400)
NET CASH PROVIDED BY FINANCING ACTIVITIES									(13,939)	(14,220)	(10,329)
Increase in cash and cash equivalents									(3,383)	(3,573)	(234)
Cash and cash equivalents at beginning of period				$ 4,576				$ 8,383	4,576	8,149	8,383
Cash and cash equivalents at end of period	$ 1,193				$ 8,149				$ 1,193	$ 4,576	$ 8,149