Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 1,526,086	$ 1,676,864
Investment securities held to maturity	121,853	38,138
Interest receivable	14,203
Interest rate contracts	34,007	1,832
Interest payable on deposits	85
Interest payable on borrowings	1,365
Interest rate contracts	0	673
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	1,526,086	1,676,864
Carrying Amount [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents	62,379	67,855
Investment securities available for sale	1,526,086	1,676,864
Investment securities held to maturity	121,853	38,138
Loans held-for-sale	2,822	16,492
Net loans receivable	4,959,341	4,793,229
FHLB Stock	30,997	36,615
Interest receivable	19,517	19,362
Interest rate contracts	34,007	1,832
Deposits	5,528,662	5,485,306
Borrowings	851,220	685,876
Interest payable on deposits	164	145
Interest payable on borrowings	1,365	1,335
Interest rate contracts		673
Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents	62,379	67,855
Investment securities available for sale	1,526,086	1,676,864
Investment securities held to maturity	117,017	39,610
Loans held-for-sale	2,759	16,934
Net loans receivable	4,877,212	4,830,136
Interest receivable	19,517	19,362
Interest rate contracts	34,007	1,832
Deposits	5,515,560	5,490,923
Borrowings	853,824	701,419
Interest payable on deposits	164	145
Interest payable on borrowings	1,365	1,335
Interest rate contracts		673
Estimate of Fair Value Measurement [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents	62,379	67,855
Interest receivable	3	1
Deposits	3,865,416	3,607,560
Interest payable on deposits	79	96
Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	1,526,086	1,676,864
Investment securities held to maturity	117,017	39,610
Loans held-for-sale	2,759	16,934
Interest receivable	5,311	4,238
Interest rate contracts	34,007	1,832
Interest rate contracts		673
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net loans receivable	4,877,212	4,830,136
Interest receivable		15,123
Deposits	1,650,144	1,883,363
Borrowings	$ 853,824	701,419
Interest payable on deposits		49
Interest payable on borrowings		$ 1,335