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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,405	$ 5,607	$ 5,874	$ 5,092
Transfers into (out of) Level 3	0	0	0	0
Change Included in Earnings	136	(471)	410	(459)
Issuances	126	467	383	970
Ending Balance	$ 6,667	$ 5,603	$ 6,667	$ 5,603