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Loans and Allowance for Credit Losses - Summary of Amortized Cost of Nonaccrual Loans with No Related Allowance (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	$ 96,536	$ 87,823
Amortized Cost of Nonaccrual Loans with no related Allowance	91,851	42,122
Commercial and Industrial Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	83,445	33,769
Amortized Cost of Nonaccrual Loans with no related Allowance	79,971	9,916
Specialty Lending Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	1,211	19,437
Amortized Cost of Nonaccrual Loans with no related Allowance		242
Commercial Real Estate Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	6,687	28,386
Amortized Cost of Nonaccrual Loans with no related Allowance	6,687	25,733
Consumer Real Estate Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	4,631	5,345
Amortized Cost of Nonaccrual Loans with no related Allowance	4,631	5,345
Consumer Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	62	88
Amortized Cost of Nonaccrual Loans with no related Allowance	62	88
Credit Cards Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	500	798
Amortized Cost of Nonaccrual Loans with no related Allowance	$ 500	$ 798

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- Definition

Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Name Regulation S-K (SK)
-Number 229
-Section 1405
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
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