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Fair Values of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 2,542,250 $ 2,292,244
Securities available for sale 3,059,452 2,959,719
Securities held to maturity 1,004 1,002
Other securities 305,184 277,517
Loans held for sale 31,277 44,360
Net loans 24,709,122 21,673,493
Derivative financial assets 789 1,261
Deposits 27,060,939 23,961,859
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,542,250 2,292,244
Securities available for sale 3,059,452 2,959,719
Securities held to maturity 1,004 1,002
Other securities 305,184 277,517
Loans held for sale 31,277 44,360
Net loans 24,411,604 21,401,649
Derivative financial assets 789 1,261
Deposits 27,060,939 23,961,859
Short-term borrowings 198,573 176,090
Long-term borrowings 531,817 540,420
Derivative financial liabilities 70 20
Carrying Amount [Member] | Marketable Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 34,760 21,058
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,542,250 2,292,244
Securities available for sale 3,059,452 2,959,719
Securities held to maturity 1,020 1,020
Other securities 289,925 263,641
Loans held for sale 31,277 44,360
Net loans 24,432,980 20,868,239
Derivative financial assets 789 1,261
Deposits 27,031,873 23,922,063
Short-term borrowings 198,573 176,090
Long-term borrowings 524,281 505,305
Derivative financial liabilities 70 20
Fair Value [Member] | Marketable Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 34,760 21,058
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Securities available for sale 4,678 4,965
Securities held to maturity 0 0
Other securities 0 0
Loans held for sale 0 0
Net loans 0 0
Derivative financial assets 0 0
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Derivative financial liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 29,356 21,058
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,542,250 2,292,244
Securities available for sale 3,054,774 2,954,754
Securities held to maturity 0 0
Other securities 0 0
Loans held for sale 0 0
Net loans 0 0
Derivative financial assets 316 644
Deposits 27,031,873 23,922,063
Short-term borrowings 198,573 176,090
Long-term borrowings 524,281 505,305
Derivative financial liabilities 70 0
Significant Other Observable Inputs (Level 2) [Member] | Marketable Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 5,404 0
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Securities available for sale 0 0
Securities held to maturity 1,020 1,020
Other securities 289,925 263,641
Loans held for sale 31,277 44,360
Net loans 24,432,980 20,868,239
Derivative financial assets 473 617
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Derivative financial liabilities 0 20
Significant Unobservable Inputs (Level 3) [Member] | Marketable Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities $ 0 $ 0