Loans and Allowance for Credit Losses - Credit risk profile based on rating category and year of origination (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Amount of loan relationships subject to annual credit analysis	$ 3,000
Loan relationships that are subject to independent annual review	1,000
2024 / 2023	400,843	$ 1,112,842
Prior	578,218	213,074
Total	3,732,153	3,619,197
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	390,190	1,089,767
Prior	576,943	208,612
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	5,830	10,385
Prior	1,006	3,990
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		2,940
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	4,823	9,750
Prior	269	472
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	108,504	330,193
Prior	234,985	103,843
Total	1,160,264	1,133,417
Residential Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	107,789	328,142
Prior	234,225	103,735
Residential Real Estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	715	1,214
Prior	562	108
Residential Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		837
Prior	198
Construction Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	42,047	125,089
Prior	13,059	3,190
Total	244,227	190,856
Construction Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	42,047	124,479
Prior	13,059	3,190
Construction Real Estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		280
Construction Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		330
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	116,568	481,395
Prior	264,746	93,439
Total	1,558,600	1,562,379
Commercial Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	107,362	462,643
Prior	264,588	89,272
Commercial Real Estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	4,865	8,122
Prior	158	3,879
Commercial Real Estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		2,940
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	4,341	7,690
Prior		288
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	18,143	36,107
Prior	3,986	1,692
Total	139,163	133,515
Consumer loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	18,143	36,003
Prior	3,986	1,692
Consumer loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		71
Consumer loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023		33
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	115,581	140,058
Prior	61,442	10,910
Total	629,899	599,030
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	114,849	138,500
Prior	61,085	10,723
Commercial loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	250	698
Prior	286	3
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	482	860
Prior	$ 71	$ 184