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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | $ 123,012 |
Current Loans | 16,473,314 |
Total loans | 16,596,326 | $ 17,481,309
Accruing Loans 90 or More Days Past Due | 30,513 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 31,884 |
Current Loans | 4,723,461 |
Total loans | 4,755,345 | 4,955,341
Accruing Loans 90 or More Days Past Due | 9,282 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 16,185 |
Current Loans | 1,007,017 |
Total loans | 1,023,202 | 1,235,198
Accruing Loans 90 or More Days Past Due | 1,017 |
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Current Loans | 1,926,824 |
Total loans | 1,926,824 | 2,433,849
Accruing Loans 90 or More Days Past Due | 0 |
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 59,314 |
Current Loans | 5,830,423 |
Total loans | 5,889,737 | 5,796,653
Accruing Loans 90 or More Days Past Due | 18,135 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 2,548 |
Current Loans | 1,163,761 |
Total loans | 1,166,309 | 1,223,814
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 | 9,738 |
Current Loans | 1,342,240 |
Total loans | 1,351,978 | 1,330,774
Accruing Loans 90 or More Days Past Due | 1,791 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 3,343 |
Current Loans | 479,588 |
Total loans | 482,931 | $ 505,680
Accruing Loans 90 or More Days Past Due | 288 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 67,265 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 20,612 |
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 | 1,717 |
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 Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 31,764 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 2,548 |
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 | 7,569 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 3,055 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 55,747 |
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 | 11,272 |
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 | 14,468 |
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 Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 27,550 |
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 | 2,169 |
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 | $ 288 |

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