Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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New Accounting Pronouncements - Additional Information (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Jul. 01, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)	$ 42,732,000			$ 40,362,000
Allowance for loan losses	7,535,000	$ 7,166,000		7,052,000	$ 6,611,000	$ 6,395,000	$ 6,599,000
Off-Balance-Sheet, Credit Loss, Liability	$ 307,000		$ 496,000	$ 0
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)			388,000,000
Allowance for loan losses			47,000,000
Off-Balance-Sheet, Credit Loss, Liability			$ 496,000,000