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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, 2024
Dec. 31, 2023
Sep. 30, 2023
Financial assets:      
Cash and due from banks $ 110,141,000 $ 81,626,000  
Cash at Federal Reserve and other banks 209,973,000 17,075,000  
Equity securities, fair value 0   $ 0
Financial liabilities:      
Other borrowings 266,767,000 632,582,000  
Junior subordinated debt 101,164,000 101,099,000  
Carrying Amount | Level 1      
Financial assets:      
Cash and due from banks 110,141,000 81,626,000  
Cash at Federal Reserve and other banks 209,973,000 17,075,000  
Carrying Amount | Level 2      
Financial assets:      
Securities held to maturity 117,259,000 133,494,000  
Equity securities, fair value 17,250,000 17,250,000  
Financial liabilities:      
Deposits 8,037,091,000 7,834,038,000  
Other borrowings 266,767,000 632,582,000  
Carrying Amount | Level 3      
Financial assets:      
Loans, net 6,560,131,000 6,672,948,000  
Financial liabilities:      
Junior subordinated debt 101,164,000 101,099,000  
Fair Value | Level 1      
Financial assets:      
Cash and due from banks 110,141,000 81,626,000  
Cash at Federal Reserve and other banks 209,973,000 17,075,000  
Fair Value | Level 2      
Financial assets:      
Securities held to maturity 113,708,000 125,126,000  
Financial liabilities:      
Deposits 8,035,484,000 7,828,554,000  
Other borrowings 266,767,000 632,582,000  
Fair Value | Level 3      
Financial assets:      
Loans, net 6,259,677,000 6,278,577,000  
Financial liabilities:      
Junior subordinated debt $ 105,949,000 $ 95,407,000