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Loans (Investment in Loans Related to Allowance for Loan Loss by Portfolio Segment Disaggregated Based on Impairment Methodology) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 16,336,397 | $ 17,481,309
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 5,364,954 | 4,955,341
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,077,792 | 1,235,198
Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 428,882 | 2,433,849
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 6,272,339 | 5,796,653
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,304,271 | 1,223,814
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,410,790 | 1,330,774
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 477,369 | 505,680
Specific Valuation Allowances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 16,452 | 15,279
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 10,536 | 5,321
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 5,480 | 9,427
Specific Valuation Allowances [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 0 | 0
Specific Valuation Allowances [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 200 | 513
Specific Valuation Allowances [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 200 | 0
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 36 | 0
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 0 | 18
Loans Individually Evaluated for Impairment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 66,837 | 80,495
Loans Individually Evaluated for Impairment [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 24,523 | 21,287
Loans Individually Evaluated for Impairment [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 16,393 | 22,888
Loans Individually Evaluated for Impairment [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 0 | 0
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 24,670 | 34,057
Loans Individually Evaluated for Impairment [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 948 | 1,684
Loans Individually Evaluated for Impairment [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 303 | 561
Loans Individually Evaluated for Impairment [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 0 | $ 18

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