Mortgage Servicing Rights - Summary of Activity in Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Servicing Asset at Amortized Cost [Line Items]
MSRs valuation allowance beginning balance	$ 0	$ (1,383)	$ (883)	$ (1,383)	$ (1,383)
Aggregate additions charged and recoveries credited to operations	0	379	883	379
MSRs impairment	0	(629)	0	(629)
MSRs valuation allowance ending balance	0	(1,633)	0	(1,633)	(883)
MSRs, net of valuation allowance	22,593	22,540	22,593	22,540
Mortgage Servicing Rights [Member]
Servicing Asset at Amortized Cost [Line Items]
MSRs beginning balance	23,089	23,401	24,027	22,338	22,338
Addition from acquisition of subsidiary	0	0	0	0
Amount capitalized	423	3,111	1,110	6,335
Amount amortized	(919)	(2,339)	(2,544)	(4,500)
MSRs ending balance	$ 22,593	$ 24,173	22,593	$ 24,173	24,027
MSRs impairment			$ 0		$ 629