Investment Securities - Additional Information (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2025 USD ($) Security shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities available for sale		$ 1,014,194	$ 1,147,623
Other investments		$ 32,600	25,200
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | Security		143
Equity Securities, FV-NI, Gain (Loss)		$ 5,146	5,664	$ 0
Total debt securities, Amortized Cost		1,096,232	1,267,747
Debt Securities, Available-for-Sale		$ 1,014,194	1,147,623
Expected Class B2 Shares | shares		13,340
Expected Class C Visa Shares | shares		5,294
Other Investments and Securities, at Cost		$ 5,700
Gain (Loss) on Sale of Other Investments		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings On Assets Held At Year End		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Between Levels 1 And 2		0
Corporate securities transferred from Level 3 to Level 2			0
Proceeds from sale		69,862	69,598	33,756
2021 Share Repurchase Plan 2
Debt Securities, Available-for-sale [Line Items]
Announcement of common stock repurchase program					$ 25,000
Obligations of U.S. Government-Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale		295,500
Total debt securities, Amortized Cost	[1]	336,500
Debt Securities, Available-for-Sale		295,500
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Deposit Liabilities, Collateral Issued, Financial Instruments		349,200	247,500
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Deposit Liabilities, Collateral Issued, Financial Instruments		624,000	580,500
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale		295,523	350,584
Total debt securities, Amortized Cost		336,493	413,434
Debt Securities, Available-for-Sale		295,523	350,584
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale		46,531	61,493
Total debt securities, Amortized Cost		46,969	62,475
Debt Securities, Available-for-Sale		46,531	61,493
Sales [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Gains		0	0	0
Calls And Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Gains		794	89	$ 0
Cost Basis
Debt Securities, Available-for-sale [Line Items]
Securities available for sale		53,700	75,100
Debt Securities, Available-for-Sale		53,700	$ 75,100
Legacy
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale		48,500
Center Bank
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale		$ 21,400

[1] Mortgage-Backed Securities include an amortized cost of $704.2 million and a fair value of $664.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $336.5 million and a fair value of $295.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.