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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 ($)
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Financial assets:      
Cash and due from banks $ 130,147,000 $ 85,409,000  
Cash at Federal Reserve and other banks 184,121,000 59,547,000  
Restricted equity securities 0   $ 0
Financial liabilities:      
Other borrowings 17,788,000 89,610,000  
Junior subordinated debt 101,264,000 101,191,000  
Carrying Amount | Level 1      
Financial assets:      
Cash and due from banks 130,147,000 85,409,000  
Cash at Federal Reserve and other banks 184,121,000 59,547,000  
Carrying Amount | Level 2      
Financial assets:      
Securities held to maturity 101,672,000 111,866,000  
Restricted equity securities 17,250,000 17,250,000  
Financial liabilities:      
Deposits 8,375,809,000 8,087,576,000  
Other borrowings 17,788,000 89,610,000  
Carrying Amount | Level 3      
Financial assets:      
Loans, net 6,834,538,000 6,643,157,000  
Financial liabilities:      
Junior subordinated debt 101,264,000 101,191,000  
Fair Value | Level 1      
Financial assets:      
Cash and due from banks 130,147,000 85,409,000  
Cash at Federal Reserve and other banks 184,121,000 59,547,000  
Fair Value | Level 2      
Financial assets:      
Securities held to maturity 96,973,000 104,349,000  
Financial liabilities:      
Deposits 8,372,459,000 8,085,150,000  
Other borrowings 17,788,000 89,780,000  
Fair Value | Level 3      
Financial assets:      
Loans, net 6,578,926,000 6,293,727,000  
Financial liabilities:      
Junior subordinated debt $ 105,760,000 $ 103,630,000