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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2002 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Cash and cash equivalents maturity period, days |  |  | 90 days |  |  |
Allowance for credit losses |  |  | $ 101,466 | $ 55,525 | $ 55,562 | $ 60,195
Credit loss expense for off-balance sheet credit exposures |  |  | 29,700 |  |  |
Retained earnings |  |  | 718,090 | 695,273 |  |
Individually evaluated for impairment |  |  | $ 8,974 | $ 5,067 |  |
Percentage of participants matched contribution |  |  | 6.00% |  |  |
Dividends paid on unallocated ESOP shares over period |  |  | 30 years |  |  |
Shares held by the DDFP |  |  | 180,897 |  |  |
Dividends paid on unallocated ESOP shares over period |  | 10 years |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 7,920 |  |  |  |  |
Retained earnings | 8,300 |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses | 7,900 |  |  |  |  |
Credit loss expense for off-balance sheet credit exposures | 3,200 |  |  |  |  |
Retained earnings | 8,300 |  |  |  |  |
Accounting Standards Update 2016-13 | Construction |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 1,300 |  |  |  |  |
Depositor Relationships |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortized accelerated basis period |  |  | 8 years 9 months 18 days |  |  |
Estimated useful life of core deposits |  |  | 10 years |  |  |
Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Individual loans evaluated for impairment, minimum balance |  |  | $ 1,000 |  |  |
Beacon Trust | Customer Relationships |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortized accelerated basis period |  |  | 12 years |  |  |
The MDE Group | Customer Relationships |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortized accelerated basis period |  |  | 10 years 4 months 24 days |  |  |
Tirschwell & Loewy, Inc. | Customer Relationships |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortized accelerated basis period |  |  | 10 years |  |  |
SB One Bancorp |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  | $ 13,600 |  |  |
SB One Bancorp | Customer Relationships |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortized accelerated basis period |  |  | 13 years |  |  |

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