Investment Securities and Other Investments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Investments [Line Items]
Federal home loan bank stock	$ 11,900	$ 11,900	$ 12,300
Federal reserve bank stock	5,900	5,900	5,900
Correspondent bank stock	468	468	468
Other equity investments	4,400	4,400	12,900
Securities available for sale, at fair value	307,427	307,427	321,081	[1]
Other Investments, Total	21,099	21,099	29,467	[1]
Sale of investment securities		6,400
Realized loss on investment		(69)
Impairment charge	8,500	8,500
Asset Pledged as Collateral without Right [Member] | FHLB [Member]
Schedule Of Investments [Line Items]
Securities pledged	$ 266,700	$ 266,700	35,900
Asset Pledged as Collateral without Right [Member] | Bank Term Funding Program Borrowings [Member]
Schedule Of Investments [Line Items]
Securities pledged			260,900
Debt securities, amortized cost			262,700
Securities available for sale, at fair value			$ 218,700

[1] Derived from audited December 31, 2023 Consolidated Financial Statements.