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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2002 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Cash and cash equivalents maturity period, days |  | 90 days
Percentage of participants matched contribution |  | 6.00%
Dividends paid on unallocated ESOP shares over period (in years) |  | 30 years
Shares held by the DDFP (in shares) |  | 296,049
Service period of employee subjected to elimination of postretirement healthcare benefits (in years) | 10 years |
Reclassification due to the adoption of ASU No. 2018-02 |  | $ 0
Depositor Relationships [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Amortized accelerated basis period (in years) |  | 8 years 9 months 18 days
Building [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life, (in years) |  | 25 years
Building [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life, (in years) |  | 40 years
Furniture And Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life, (in years) |  | 3 years
Furniture And Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life, (in years) |  | 5 years
Beacon Trust [Member] | Customer Relationships [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Amortized accelerated basis period (in years) |  | 12 years
The MDE Group [Member] | Customer Relationships [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Amortized accelerated basis period (in years) |  | 10 years 4 months 24 days
Accounting Standards Update 2018-02 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Reclassification due to the adoption of ASU No. 2018-02 |  | $ 1,400

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