Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Jan. 01, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Fair value adjustments on other investments			$ 110,000	$ 9,300,000	$ 7,300,000
Other equity investments			12,900,000	23,800,000
Other investments			29,467,000	24,672,000
Residential mortgage loans held for sale			14,100,000	15,100,000
Loans held for sale			46,337,000	69,534,000
Allowance for loan losses			$ 35,893,000	30,740,000	12,121,000		$ 13,827,000
Estimated useful lives			us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Lease Income			$ 0	0
Impairment of goodwill		$ 26,800,000	26,826,000	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 185,989,000	248,793,000	277,139,000		$ 108,200,000
Number of reportable business segments | Segment			3
Retained earnings			$ 33,157,000	97,682,000
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value	$ 665,000
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)	5,600,000		3,800,000
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price	59,300,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Allowance for loan losses				7,418,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				(8,111,000)	$ 3,542,000	$ 3,500,000
Retained earnings				(8,111,000)
ASC 326 [Member]
Summary Of Significant Accounting Policies [Line Items]
Allowance for loan losses	38,158,000		7,400,000
Retained earnings	$ 89,571,000
Reduced stockholders' equity			2,900,000
Fair value investments entities that calculate net asset value per share unfunded committments			3,700,000
ASC 326 [Member] | Allowance for Credit Losses [Member]
Summary Of Significant Accounting Policies [Line Items]
Reduced stockholders' equity			5,200,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Asset with financial institutions			3,000,000,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Asset with financial institutions			$ 5,000,000,000
Purchased Computer Software [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			1 year
Purchased Computer Software [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			3 years
Building [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			39 years
Building [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			40 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			15 years
Special Mention [Member]
Summary Of Significant Accounting Policies [Line Items]
Line Of credit facility current borrowing capacity			$ 500,000,000
Pooled Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Line Of credit facility current borrowing capacity			1,000,000,000
Fintech [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans held for sale			27,700,000	9,800,000
Government Guaranteed Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans held for sale			$ 4,500,000	$ 44,700,000