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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale $ 1,210,917 $ 1,553,905
Derivative assets $ 10,479 $ 41,099
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Interest Receivable and Other Assets Interest Receivable and Other Assets
Derivative liabilities $ 9,105 $ 39,176
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale $ 1,176,009 $ 1,498,045
U.S. Federal Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 8,232 11,770
Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 13,044 14,795
States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 6,436 10,010
Asset backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale   12,512
Other Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 7,196 6,773
Level 1 Inputs [Member] | U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 1,176,009 1,498,045
Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 10,479 41,099
Derivative liabilities 9,105 39,176
Level 2 Inputs [Member] | U.S. Federal Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 8,232 11,770
Level 2 Inputs [Member] | Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 13,044 14,795
Level 2 Inputs [Member] | States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 6,286 9,830
Level 2 Inputs [Member] | Asset backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale   12,512
Level 2 Inputs [Member] | Other Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 7,196 6,773
Level 3 Inputs [Member] | States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale $ 150 $ 180