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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 16,542,537 | $ 16,336,397
Accruing Loans 90 or More Days Past Due | 16,572 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,584,117 | 5,364,954
Accruing Loans 90 or More Days Past Due | 4,166 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,036,579 | 1,077,792
Accruing Loans 90 or More Days Past Due | 287 |
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 207,669 | 428,882
Accruing Loans 90 or More Days Past Due | 8,377 |
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,376,521 | 6,272,339
Accruing Loans 90 or More Days Past Due | 1,046 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,421,878 | 1,304,271
Accruing Loans 90 or More Days Past Due | 0 |
Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,433,625 | 1,410,790
Accruing Loans 90 or More Days Past Due | 2,103 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 482,148 | $ 477,369
Accruing Loans 90 or More Days Past Due | 593 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 47,820 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 13,016 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 671 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,542 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,988 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,210 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,393 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37,349 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,042 |
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] |  |
Financing Receivable, before Allowance for Credit Loss | 6,382 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,377 |
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] |  |
Financing Receivable, before Allowance for Credit Loss | 11,546 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 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] |  |
Financing Receivable, before Allowance for Credit Loss | 2,409 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 593 |
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 85,169 |
Financial Asset, Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,058 |
Financial Asset, Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,382 |
Financial Asset, Past Due | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,048 |
Financial Asset, Past Due | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 33,088 |
Financial Asset, Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,988 |
Financial Asset, Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,619 |
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,986 |
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,457,368 |
Financial Asset, Not Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,563,059 |
Financial Asset, Not Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,030,197 |
Financial Asset, Not Past Due | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 198,621 |
Financial Asset, Not Past Due | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,343,433 |
Financial Asset, Not Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,419,890 |
Financial Asset, Not Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,427,006 |
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 475,162 |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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