Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) - Mortgage servicing rights - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,741	$ 6,667	$ 6,712	$ 5,874
Transfers into (out of) Level 3	0	0		0
Change Included in Earnings	(91)	33	(215)	443
Issuances	142	98	295	481
Ending Balance	$ 6,792	$ 6,798	$ 6,792	$ 6,798