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Loans (Non-Accrual Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | $ 37,833 | $ 53,713
Financing Receivable, Nonaccrual, No Allowance | 18,571 | 27,202
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 18,130 | 22,582
Financing Receivable, Nonaccrual, No Allowance | 8,514 | 4,701
Commercial and Industrial Total Energy Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 15,224 | 14,433
Financing Receivable, Nonaccrual, No Allowance | 7,139 | 8,533
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 3,552 | 15,297
Financing Receivable, Nonaccrual, No Allowance | 1,991 | 13,817
Construction Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 0 | 948
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Total consumer real estate loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 927 | 440
Financing Receivable, Nonaccrual, No Allowance | 927 | 138
Consumer Loan [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 0 | 13
Financing Receivable, Nonaccrual, No Allowance | $ 0 | $ 13

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- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 + Details
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