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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2018 USD ($) Segment Office | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 16, 2009
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of operating business segments | Segment | 2 |  |  |
Net unrealized holding gain after tax | $ (20,092,000) | $ (8,719,000) | $ (10,738,000) |
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 |  |  |
Original terms of modified loans | 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 |  |  |
Allowance for loan losses look-back period, revised | Rolling 20-quarters |  |  |
Agreed percentage of losses in loss sharing agreement |  |  |  | 80.00%
Commercial loans expiration date | Oct. 16, 2014 |  |  |
Goodwill impairment | $ 0 |  |  |
Number of offices providing services, CitizensTrust | Office | 3 |  |  |
Assets under administration, CitizensTrust | $ 2,540,000,000 |  |  |
Assets under management, CitizensTrust | $ 1,800,000,000 |  |  |
Single-family Residential Loans [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Commercial loans expiration date | Oct. 16, 2019 |  |  |
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 |  |  |
Length of modified debt term | 3 months |  |  |
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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