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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 ($)
Dec. 31, 2023
Dec. 31, 2022
Financial assets:    
Cash and due from banks $ 81,626,000 $ 96,323,000
Cash at Federal Reserve and other banks 17,075,000 10,907,000
Restricted equity securities 0 0
Financial liabilities:    
Other borrowings 632,582,000 264,605,000
Junior subordinated debt 101,099,000 101,040,000
Level 3 | Overdraft privilege commitments    
Off-balance sheet:    
Contract amount, Off-balance sheet 121,539,000 126,634,000
Level 3 | Standby letters of credit    
Off-balance sheet:    
Contract amount, Off-balance sheet 38,449,000 26,599,000
Level 3 | Commitments    
Off-balance sheet:    
Contract amount, Off-balance sheet 2,225,677,000 2,188,560,000
Fair Value | Level 1    
Financial assets:    
Cash and due from banks 81,626,000 96,323,000
Cash at Federal Reserve and other banks 17,075,000 10,907,000
Fair Value | Level 2    
Financial assets:    
Securities held to maturity 125,126,000 149,938,000
Financial liabilities:    
Deposits 7,828,554,000 8,321,517,000
Other borrowings 632,582,000 264,605,000
Fair Value | Level 3    
Financial assets:    
Loans, net 6,278,577,000 6,153,155,000
Financial liabilities:    
Junior subordinated debt 95,407,000 92,613,000
Fair Value | Level 3 | Overdraft privilege commitments    
Off-balance sheet:    
Fair value, Off-balance sheet 1,215,000 1,266,000
Fair Value | Level 3 | Standby letters of credit    
Off-balance sheet:    
Fair value, Off-balance sheet 385,000 266,000
Fair Value | Level 3 | Commitments    
Off-balance sheet:    
Fair value, Off-balance sheet 22,257,000 21,886,000
Carrying Amount | Level 1    
Financial assets:    
Cash and due from banks 81,626,000 96,323,000
Cash at Federal Reserve and other banks 17,075,000 10,907,000
Carrying Amount | Level 2    
Financial assets:    
Securities held to maturity 133,494,000 160,983,000
Restricted equity securities 17,250,000 17,250,000
Financial liabilities:    
Deposits 7,834,038,000 8,329,013,000
Other borrowings 632,582,000 264,605,000
Carrying Amount | Level 3    
Financial assets:    
Loans, net 6,672,948,000 6,344,767,000
Financial liabilities:    
Junior subordinated debt $ 101,099,000 $ 101,040,000