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Loans - Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 18,399,259 | $ 17,154,969
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 5,836,877 | 5,674,798
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,006,859 | 925,729
Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 17,945 | 34,852
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 7,193,785 | 6,706,078
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 1,544,666 | 1,477,247
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 2,339,363 | 1,843,539
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 459,764 | 492,726
Specific Valuation Allowances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 9,810 | 12,181
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 5,362 | 6,082
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 2,700 | 4,383
Specific Valuation Allowances [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 0 | 0
Specific Valuation Allowances [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 1,446 | 1,716
Specific Valuation Allowances [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 0 | 0
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 302 | 0
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Specific Allocations | 0 | 0
Loans Individually Evaluated for Impairment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 65,162 | 52,576
Loans Individually Evaluated for Impairment [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 26,455 | 18,980
Loans Individually Evaluated for Impairment [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 14,054 | 15,058
Loans Individually Evaluated for Impairment [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 22,318 | 17,711
Loans Individually Evaluated for Impairment [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0
Loans Individually Evaluated for Impairment [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | 2,335 | 827
Loans Individually Evaluated for Impairment [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 0 | $ 0

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481696/310-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4 + Details
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