Investment Securities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Investment	Dec. 31, 2023 USD ($) Investment	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged to secure public deposits and other contractual obligations	$ 424,800	$ 464,000
Number of investments in non-federal issuer representing more than 10% of shareholders' equity | Investment	0	0
Maximum investment in any single non-federal issuer representing shareholders' equity	10.00%	10.00%
Unrealized loss position, fair value	$ 115,007	$ 128,277
Unrealized loss position, accumulated loss	19,104	17,500
Fair value AFS in unrealized loss with an ACL	271,800	258,855
Available-for-sale securities in unrealized loss position, accumulated loss	39,575	35,629
Debt securities in an unrealized loss, net of allowance	68,300
Debt securities unrealized accumulated loss	5,900
Securities, available-for-sale, allowance for credit loss	839	731
Proceeds from sale	505	0	$ 1,530
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 1,200
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value AFS in unrealized loss with an ACL		780
Available-for-sale securities in unrealized loss position, accumulated loss		1
Number of securities | Investment	32
Securities, available-for-sale, allowance for credit loss	$ 839	731	$ 1,140
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | Investment	2
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Number of securities | Investment	1
U.S. Government Corporations and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | Investment	114
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value AFS in unrealized loss with an ACL	$ 1,685	2,001
Available-for-sale securities in unrealized loss position, accumulated loss	133	200
Securities, available-for-sale, allowance for credit loss	$ 0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | Investment	1
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value AFS in unrealized loss with an ACL		1,029
Available-for-sale securities in unrealized loss position, accumulated loss		1
Securities, available-for-sale, allowance for credit loss	$ 0	$ 0