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Loans (Age Analysis of Past Due Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | $ 146,973 |
Current Loans | 14,603,359 |
Total loans | 14,750,332 | $ 14,099,733
Accruing Loans 90 or More Days Past Due | 7,421 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 46,742 |
Current Loans | 5,140,724 |
Total loans | 5,187,466 | 5,111,957
Accruing Loans 90 or More Days Past Due | 3,430 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 68,702 |
Current Loans | 1,584,180 |
Total loans | 1,652,882 | 1,602,598
Accruing Loans 90 or More Days Past Due | 85 |
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 15,109 |
Current Loans | 4,868,471 |
Total loans | 4,883,580 | 4,428,721
Accruing Loans 90 or More Days Past Due | 967 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 1,261 |
Current Loans | 1,311,398 |
Total loans | 1,312,659 | 1,267,717
Accruing Loans 90 or More Days Past Due | 402 |
Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 9,571 |
Current Loans | 1,184,842 |
Total loans | 1,194,413 | 1,118,990
Accruing Loans 90 or More Days Past Due | 1,425 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 5,588 |
Current Loans | 513,744 |
Total loans | 519,332 | $ 569,750
Accruing Loans 90 or More Days Past Due | 1,112 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 56,107 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 25,474 |
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 | 6,136 |
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 | 12,384 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 195 |
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 | 7,442 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 4,476 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due Loans | 90,866 |
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 | 21,268 |
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 | 62,566 |
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 | 2,725 |
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 | 1,066 |
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 | 2,129 |
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 | $ 1,112 |

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