Loans and Allowance for Credit Losses - Collateral dependent loans and related ACL (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Total Loans Receivable	$ 3,771,445		$ 3,619,197
Related allowance for credit losses	51,336	$ 50,084	47,820	$ 45,685	$ 37,483	$ 33,192
Collateral-dependent Loans
Total Loans Receivable	25,215		6,376
Related allowance for credit losses	9,889		901
Residential Real Estate
Total Loans Receivable	1,200,723		1,133,417
Related allowance for credit losses	15,357	15,096	15,641	13,465	12,499	8,908
Residential Real Estate | Collateral-dependent Loans | 1- to 4-family residential loans
Total Loans Receivable	807		837
Related allowance for credit losses	126		156
Construction Real Estate
Total Loans Receivable	205,061		190,856
Related allowance for credit losses	2,347	2,864	2,664	3,638	2,754	2,220
Construction Real Estate | Collateral-dependent Loans
Total Loans Receivable			642
Related allowance for credit losses			79
Commercial Real Estate
Total Loans Receivable	1,608,935		1,562,379
Related allowance for credit losses	26,610	25,177	22,838	18,545	16,806	16,838
Commercial Real Estate | Collateral-dependent Loans
Total Loans Receivable	23,230		4,897
Related allowance for credit losses	9,269		666
Commercial loans
Total Loans Receivable	616,603		599,030
Related allowance for credit losses	6,122	$ 6,057	$ 5,768	$ 9,051	$ 4,663	$ 4,516
Commercial loans | Collateral-dependent Loans
Total Loans Receivable	1,178
Related allowance for credit losses	$ 494