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Fair Value - Carrying Amount and Estimated Fair Values of Financial Instrument (Detail) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 155,413,000 $ 259,954,000
Available-for-sale securities 1,198,962,000 1,327,442,000
Loans held for sale 1,518,000 4,214,000
Loans, net of allowance for credit losses 3,208,524,000 3,107,262,000
Federal Reserve Bank and Federal Home Loan Bank stock 24,428,000 17,510,000
Interest receivable 18,497,000 18,048,000
Derivative assets 8,834,000 5,021,000
Total assets 5,000,415,000 5,137,631,000
Deposits 4,226,611,000 4,420,004,000
Federal funds purchased and retail repurchase agreements 47,443,000 56,006,000
Federal Home Loan Bank advances 186,001,000 0
Subordinated debt 96,263,000 95,885,000
Contractual obligations 15,562,000 17,692,000
Derivative Liabilities 7,618,000 5,553,000
Cash collateral held by counterparty and netting adjustments (5,769,000) 2,994,000
Total liabilities 4,604,609,000 4,637,000,000
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 155,413,000 259,954,000
Available-for-sale securities 1,198,962,000 1,327,442,000
Loans held for sale 1,518,000 4,214,000
Loans, net of allowance for credit losses 3,208,524,000 3,107,262,000
Federal Reserve Bank and Federal Home Loan Bank stock 24,428,000 17,510,000
Interest receivable 18,497,000 18,048,000
Derivative assets 8,834,000 5,021,000
Cash collateral held by derivative counterparty and netting adjustments (5,769,000) 2,994,000
Total derivative assets 3,065,000 8,015,000
Equity securities with readily determinable fair value 556,000 644,000
Total assets 4,610,963,000 4,743,089,000
Deposits 4,226,611,000 4,420,004,000
Federal funds purchased and retail repurchase agreements 47,443,000 56,006,000
Federal Home Loan Bank advances 186,001,000  
Subordinated debt 23,171,000 22,924,000
Subordinated notes 73,092,000 72,961,000
Contractual obligations 15,562,000 17,692,000
Interest payable 1,145,000 3,187,000
Derivative Liabilities 7,618,000 5,553,000
Cash collateral held by counterparty and netting adjustments (4,156,000) (5,447,000)
Total derivative liabilities 3,462,000 106,000
Total liabilities 4,576,487,000 4,592,880,000
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 155,413,000 259,954,000
Available-for-sale securities 1,198,962,000 1,327,442,000
Loans held for sale 1,518,000 4,214,000
Loans, net of allowance for credit losses 3,146,650,000 3,100,232,000
Federal Reserve Bank and Federal Home Loan Bank stock 24,428,000 17,510,000
Interest receivable 18,497,000 18,048,000
Derivative assets 8,834,000 5,021,000
Cash collateral held by derivative counterparty and netting adjustments (5,769,000) 2,994,000
Total derivative assets 3,065,000 8,015,000
Equity securities with readily determinable fair value 556,000 644,000
Deposits 4,216,839,000 4,421,441,000
Federal funds purchased and retail repurchase agreements 47,443,000 56,006,000
Federal Home Loan Bank advances 186,001,000  
Subordinated debt 23,171,000 22,924,000
Subordinated notes 72,155,000 80,880,000
Contractual obligations 15,562,000 17,692,000
Interest payable 1,145,000 3,187,000
Derivative Liabilities 7,618,000 5,553,000
Cash collateral held by counterparty and netting adjustments (4,156,000) (5,447,000)
Total derivative liabilities 3,462,000 106,000
Total liabilities 4,565,778,000 4,602,236,000
Estimated Fair Value [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 155,413,000 259,954,000
Available-for-sale securities   155,601,000
Cash collateral held by derivative counterparty and netting adjustments (5,769,000) 2,994,000
Total derivative assets (5,769,000) 2,994,000
Equity securities with readily determinable fair value 556,000 644,000
Cash collateral held by counterparty and netting adjustments (4,156,000) (5,447,000)
Total derivative liabilities (4,156,000) (5,447,000)
Estimated Fair Value [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities 1,198,962,000 1,171,841,000
Loans held for sale 1,518,000 4,214,000
Federal Reserve Bank and Federal Home Loan Bank stock 24,428,000 17,510,000
Interest receivable 18,497,000 18,048,000
Derivative assets 8,834,000 5,021,000
Total derivative assets 8,834,000 5,021,000
Deposits 4,216,839,000 4,421,441,000
Federal funds purchased and retail repurchase agreements 47,443,000 56,006,000
Federal Home Loan Bank advances 186,001,000  
Subordinated debt 23,171,000 22,924,000
Subordinated notes 72,155,000 80,880,000
Contractual obligations 15,562,000 17,692,000
Interest payable 1,145,000 3,187,000
Derivative Liabilities 7,618,000 5,553,000
Total derivative liabilities   5,553,000
Total liabilities 4,569,934,000 4,607,683,000
Estimated Fair Value [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses 3,146,650,000 3,100,232,000
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 4,549,089,000 4,736,059,000
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 150,200,000 419,193,000
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 1,252,239,000 1,216,634,000
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets $ 3,146,650,000 $ 3,100,232,000