v3.26.1
Loans and allowance for loan losses - Summary of Payment Status of Loans Modified (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost $ 1,336,000 $ 1,466,000
Guaranteed by Government-Related Entities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modified past due 30-89 days 30,000 40,000
Modified past due 90 days or more 43,000 35,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 1,106,000 1,247,000
30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 172,000 109,000
Accruing Loans Past Due 90 Days or More    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 58,000 110,000
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 263,000 351,000
Commercial and industrial | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 247,000 281,000
Commercial and industrial | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 8,000 7,000
Commercial and industrial | Accruing Loans Past Due 90 Days or More    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 8,000 63,000
Commercial real estate | Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 578,000 653,000
Commercial real estate | Commercial | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 458,000 598,000
Commercial real estate | Commercial | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 117,000 54,000
Commercial real estate | Commercial | 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 | Residential builder and developer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 12,000 0
Commercial real estate | Residential builder and developer | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 3,000 0
Commercial real estate | Residential builder and developer | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 9,000 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 274,000 284,000
Commercial real estate | Other commercial construction | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 272,000 279,000
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 5,000
Residential real estate | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 196,000 166,000
Residential real estate | Residential | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 113,000 77,000
Residential real estate | Residential | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 36,000 48,000
Residential real estate | Residential | Accruing Loans Past Due 90 Days or More    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 47,000 41,000
Consumer | Home equity lines and loans (e)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 2,000 1,000
Consumer | Home equity lines and loans (e) | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 2,000 1,000
Consumer | Home equity lines and loans (e) | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 0 0
Consumer | Home equity lines and loans (e) | 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 1,000
Consumer | Recreational finance | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 0 1,000
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 11,000 10,000
Consumer | Other | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost 11,000 10,000
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