Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	71	43	184	174
Recorded investment | $	$ 739	$ 931	$ 2,403	$ 2,954
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	0	4	14	16
Recorded investment | $	$ 0	$ 244	$ 470	$ 585
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	71	39	170	158
Recorded investment | $	$ 739	$ 687	$ 1,933	$ 2,369