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Loans (Non-Accrual Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | $ 53,713 | $ 61,449
Financing Receivable, Nonaccrual, No Allowance | 27,202 | 21,911
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 22,582 | 19,849
Financing Receivable, Nonaccrual, No Allowance | 4,701 | 4,479
Commercial and Industrial Total Energy Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 14,433 | 23,168
Financing Receivable, Nonaccrual, No Allowance | 8,533 | 639
Paycheck Protection Program [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 0 | 0
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 15,297 | 15,737
Financing Receivable, Nonaccrual, No Allowance | 13,817 | 14,116
Construction Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 948 | 1,684
Financing Receivable, Nonaccrual, No Allowance | 0 | 1,684
Total consumer real estate loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 440 | 993
Financing Receivable, Nonaccrual, No Allowance | 138 | 993
Consumer Loan [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 13 | 18
Financing Receivable, Nonaccrual, No Allowance | $ 13 | $ 0

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