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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | $ 123,018 |
Current Loans | 17,848,919 |
Total loans | 17,971,937 | $ 14,750,332
Accruing Loans 90 or More Days Past Due | 20,997 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 57,783 |
Current Loans | 4,946,446 |
Total loans | 5,004,229 | 5,187,466
Accruing Loans 90 or More Days Past Due | 7,669 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 17,297 |
Current Loans | 1,407,583 |
Total loans | 1,424,880 | 1,652,882
Accruing Loans 90 or More Days Past Due | 2,466 |
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
Current Loans | 3,162,279 |
Total loans | 3,162,279 | 0
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 | 19,864 |
Current Loans | 5,339,521 |
Total loans | 5,359,385 | 4,883,580
Accruing Loans 90 or More Days Past Due | 5,225 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 3,164 |
Current Loans | 1,262,386 |
Total loans | 1,265,550 | 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 | 16,313 |
Current Loans | 1,233,872 |
Total loans | 1,250,185 | 1,194,413
Accruing Loans 90 or More Days Past Due | 4,661 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 8,597 |
Current Loans | 496,832 |
Total loans | 505,429 | $ 519,332
Accruing Loans 90 or More Days Past Due | 976 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 74,830 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 34,018 |
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 | 9,319 |
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 | 10,271 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 3,164 |
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 | 10,437 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 7,621 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 48,188 |
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 | 23,765 |
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 | 7,978 |
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 | 9,593 |
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 | 5,876 |
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 | $ 976 |

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