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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |
Number of operating business segments | Segment | 2 |
Number of days on which collection of interest on principal is no longer probable | 90 days |
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status | 6 months |
Number of days on which charge-offs unsecured consumer loans are recorded | 120 days |
Minimum loan amount for credit review process | $ 1,000,000.0 |
Allowance for loan losses look-back period, revised | Rolling 20-quarters |
Goodwill impairment | $ 0 |
Assets under administration, CitizensTrust | 2,860,000,000 |
Assets under management, CitizensTrust | $ 2,010,000,000.00 |
Percentage of PCI loans to Loan Receivable | 0.20% | 0.20%
Accounting Standards Update 2016-02 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Operating Lease, Liability, Current | $ 20,000,000 |
Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of days over which principal or interest payments are past due to consider loans, excluding PCI loans | 30 days |
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual | 30 days |
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual | 89 days |

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- Definition Represents the minimum threshold for loans that are subject to an annual credit review process, where all aspects of the loan, including the borrower and guarantor(s) undergo review. This review process may result in changes to the internal credit risk rating of the loan. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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