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Loans (Age Analysis of Past Due Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | $ 128,317 |
Current Loans | 17,352,992 |
Total loans | 17,481,309 | $ 14,750,332
Accruing Loans 90 or More Days Past Due | 14,288 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 55,032 |
Current Loans | 4,900,309 |
Total loans | 4,955,341 | 5,187,466
Accruing Loans 90 or More Days Past Due | 5,615 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 26,070 |
Current Loans | 1,209,128 |
Total loans | 1,235,198 | 1,652,882
Accruing Loans 90 or More Days Past Due | 3,696 |
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Current Loans | 2,433,849 |
Total loans | 2,433,849 | 0
Accruing Loans 90 or More Days Past Due | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 28,434 |
Current Loans | 5,768,219 |
Total loans | 5,796,653 | 4,883,580
Accruing Loans 90 or More Days Past Due | 1,275 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 856 |
Current Loans | 1,222,958 |
Total loans | 1,223,814 | 1,312,659
Accruing Loans 90 or More Days Past Due | 0 |
Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 11,137 |
Current Loans | 1,319,637 |
Total loans | 1,330,774 | 1,194,413
Accruing Loans 90 or More Days Past Due | 2,469 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 6,788 |
Current Loans | 498,892 |
Total loans | 505,680 | $ 519,332
Accruing Loans 90 or More Days Past Due | 1,233 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 96,862 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 45,416 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 14,833 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 22,130 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 856 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 8,090 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 5,537 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 31,455 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 9,616 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 11,237 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 6,304 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 3,047 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | $ 1,251 |

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