Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,482,000	$ 641,000
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	1,323,000	615,000
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	113,000	20,000
Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	46,000	6,000
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	312,000	95,000
Commercial and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	294,000	90,000
Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	15,000	4,000
Commercial and industrial | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	3,000	1,000
Commercial Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	601,000	150,000
Commercial Real Estate | Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	545,000	150,000
Commercial Real Estate | Commercial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	42,000	0
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	14,000	0
Commercial Real Estate | Residential builder and developer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	28,000	91,000
Commercial Real Estate | Residential builder and developer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	28,000	91,000
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Commercial Real Estate | Other commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	346,000	223,000
Commercial Real Estate | Other commercial construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	344,000	223,000
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	0
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Residential Real Estate | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	187,000	72,000
Residential Real Estate | Residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	104,000	53,000
Residential Real Estate | Residential | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	54,000	15,000
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	29,000	4,000
Residential Real Estate | Residential — limited documentation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	6,000	9,000
Residential Real Estate | Residential — limited documentation | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	6,000	7,000
Residential Real Estate | Residential — limited documentation | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	1,000
Residential Real Estate | Residential — limited documentation | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	1,000
Consumer: | Home equity lines and loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	1,000
Consumer: | Home equity lines and loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	1,000
Consumer: | Home equity lines and loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Home equity lines and loans | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 0	$ 0