Goodwill and Other Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 41,800	$ 44,185
Accumulated amortization	30,850	32,801
Net carrying amount	10,950	11,384
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,788	6,788
Accumulated amortization	6,329	5,939
Net carrying amount	459	849
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,162	8,493
Accumulated amortization	2,653	6,530
Net carrying amount	1,509	1,963
Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	30,850	28,904
Accumulated amortization	21,868	20,332
Net carrying amount	8,982	8,572
Valuation allowance included in accumulated amortization	$ 98	$ 5	$ 13	$ 87