Loans and Allowance for Credit Losses - Collateral dependent loans and related ACL (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Total Loans Receivable	$ 3,699,961	$ 3,619,197
Related allowance for credit losses	49,122	47,820	$ 37,418	$ 33,192
Collateral-dependent Loans
Total Loans Receivable	2,962	6,376
Related allowance for credit losses	457	901
Residential Real Estate
Total Loans Receivable	1,134,604	1,133,417
Related allowance for credit losses	14,846	15,641	11,937	8,908
Residential Real Estate | Collateral-dependent Loans | 1- to 4-family residential loans
Total Loans Receivable	822	837
Related allowance for credit losses	141	156
Construction Real Estate
Total Loans Receivable	232,892	190,856
Related allowance for credit losses	2,856	2,664	2,503	2,220
Construction Real Estate | Collateral-dependent Loans
Total Loans Receivable	2,140	642
Related allowance for credit losses	316	79
Commercial Real Estate
Total Loans Receivable	1,564,147	1,562,379
Related allowance for credit losses	$ 25,022	22,838	$ 17,886	$ 16,838
Commercial Real Estate | Collateral-dependent Loans
Total Loans Receivable		4,897
Related allowance for credit losses		$ 666