Goodwill and Other Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 44,185	$ 41,841
Accumulated amortization	32,801	29,993
Net carrying amount	11,384	11,848
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,788	6,788
Accumulated amortization	5,939	5,425
Net carrying amount	849	1,363
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,493	8,493
Accumulated amortization	6,530	5,886
Net carrying amount	1,963	2,607
Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,904	26,560
Accumulated amortization	20,332	18,682
Net carrying amount	8,572	7,878
Valuation allowance included in accumulated amortization	$ 5	$ 13	$ 87	$ 0