Loans and Allowance for Credit Losses - Credit risk profile based on rating category and year of origination (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
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
2021	1,034,652
2020	433,293
2019	182,774
2018	118,958
2017	115,845
Prior	143,946
Revolving loans	207,623
Total	2,237,091	$ 2,171,463
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,015,117
2020	420,483
2019	169,879
2018	115,613
2017	101,993
Prior	142,556
Revolving loans	204,930
Total	2,170,571
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,415
2020	2,697
2019	11,235
2018	1,399
2017	815
Prior	819
Revolving loans	1,321
Total	24,701
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,806
2018	1,793
2017	12,826
Revolving loans	300
Total	23,725
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	13,120
2020	1,307
2019	810
2018	153
2017	211
Prior	571
Revolving loans	1,072
Total	17,244
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2019	850
Total	850
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	366,492
2020	175,931
2019	43,986
2018	33,021
2017	23,356
Prior	72,873
Revolving loans	5,557
Total	721,216	627,357
Residential Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	361,876
2020	175,772
2019	43,576
2018	32,929
2017	23,267
Prior	71,592
Revolving loans	5,557
Total	714,569
Residential Real Estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2021	328
2020	70
2019	410
2017	89
Prior	809
Total	1,706
Residential Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	4,288
2020	89
2018	92
Prior	472
Total	4,941
Construction Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	88,418
2020	45,866
Total	134,284	107,472
Construction Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	88,371
2020	45,866
Total	134,237
Construction Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	47
Total	47
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	364,379
2020	159,978
2019	115,603
2018	79,168
2017	84,484
Prior	61,303
Revolving loans	24,878
Total	889,793	887,419
Commercial Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	351,732
2020	147,670
2019	104,746
2018	75,967
2017	70,927
Prior	61,194
Revolving loans	23,699
Total	835,935
Commercial Real Estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2021	4,456
2020	2,365
2019	9,502
2018	1,377
2017	726
Prior	10
Revolving loans	810
Total	19,246
Commercial Real Estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,806
2018	1,793
2017	12,826
Revolving loans	300
Total	23,725
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	8,191
2020	1,137
2019	505
2018	31
2017	5
Prior	99
Revolving loans	69
Total	10,037
Commercial Real Estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2019	850
Total	850
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	23,938
2020	8,626
2019	3,597
2018	1,156
2017	564
Prior	650
Revolving loans	39,143
Total	77,674	80,767
Consumer loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	23,858
2020	8,626
2019	3,597
2018	1,126
2017	534
Prior	650
Revolving loans	39,071
Total	77,462
Consumer loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2021	80
Revolving loans	48
Total	128
Consumer loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2018	30
2017	30
Revolving loans	24
Total	84
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	191,425
2020	42,892
2019	19,588
2018	5,613
2017	7,441
Prior	9,120
Revolving loans	138,045
Total	414,124	$ 468,448
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	189,280
2020	42,549
2019	17,960
2018	5,591
2017	7,265
Prior	9,120
Revolving loans	136,603
Total	408,368
Commercial loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,551
2020	262
2019	1,323
2018	22
Revolving loans	463
Total	3,621
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	594
2020	81
2019	305
2017	176
Revolving loans	979
Total	$ 2,135