Loans and Allowance for Credit Losses - Collateral dependent loans and related ACL (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022
Total Loans Receivable	$ 3,732,153		$ 3,619,197
Related allowance for credit losses	50,084		47,820	$ 37,483	$ 37,418	$ 33,192
Collateral-dependent Loans
Total Loans Receivable	26,824		6,376
Related allowance for credit losses	7,753		901
Residential Real Estate
Total Loans Receivable	1,160,264		1,133,417
Related allowance for credit losses	15,096	$ 14,846	15,641	12,499	11,937	8,908
Residential Real Estate | Collateral-dependent Loans | 1- to 4-family residential loans
Total Loans Receivable	814		837
Related allowance for credit losses	133		156
Construction Real Estate
Total Loans Receivable	244,227		190,856
Related allowance for credit losses	2,864	$ 2,856	2,664	2,754	2,503	2,220
Construction Real Estate | Collateral-dependent Loans
Total Loans Receivable			642
Related allowance for credit losses			79
Commercial Real Estate
Total Loans Receivable	1,558,600		1,562,379
Related allowance for credit losses	25,177		22,838	16,806	17,886	16,838
Commercial Real Estate | Collateral-dependent Loans
Total Loans Receivable	25,142		4,897
Related allowance for credit losses	7,250		666
Commercial loans
Total Loans Receivable	629,899		599,030
Related allowance for credit losses	6,057		$ 5,768	$ 4,663	$ 4,399	$ 4,516
Commercial loans | Collateral-dependent Loans
Total Loans Receivable	868
Related allowance for credit losses	$ 370