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Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Financial assets:      
Cash and due from banks $ 100,693,000 $ 85,409,000  
Cash at Federal Reserve and other banks 198,127,000 59,547,000  
Restricted equity securities 0   $ 0
Financial liabilities:      
Other borrowings 17,039,000 89,610,000  
Junior subordinated debt 41,238,000 101,191,000  
Carrying Amount | Level 1      
Financial assets:      
Cash and due from banks 100,693,000 85,409,000  
Cash at Federal Reserve and other banks 198,127,000 59,547,000  
Carrying Amount | Level 2      
Financial assets:      
Securities held to maturity 95,446,000 111,866,000  
Restricted equity securities 17,250,000 17,250,000  
Financial liabilities:      
Deposits 8,334,461,000 8,087,576,000  
Other borrowings 17,039,000 89,610,000  
Carrying Amount | Level 3      
Financial assets:      
Loans, net 6,882,253,000 6,643,157,000  
Financial liabilities:      
Junior subordinated debt 41,238,000 101,191,000  
Fair Value | Level 1      
Financial assets:      
Cash and due from banks 100,693,000 85,409,000  
Cash at Federal Reserve and other banks 198,127,000 59,547,000  
Fair Value | Level 2      
Financial assets:      
Securities held to maturity 91,299,000 104,349,000  
Financial liabilities:      
Deposits 8,331,961,000 8,085,150,000  
Other borrowings 17,039,000 89,780,000  
Fair Value | Level 3      
Financial assets:      
Loans, net 6,651,009,000 6,293,727,000  
Financial liabilities:      
Junior subordinated debt $ 41,605,000 $ 103,630,000