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Office Properties and Equipment - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2020 USD ($) property
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation expense | $ 2,875 | $ 2,504 | $ 1,959 |
Held for sale |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Carrying value of office property held for sale | $ 1,275 |  |  |
Expected | Expected sale |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Carrying value of office property held for sale |  |  |  | $ 410
Number of properties held for sale expected to close | property |  |  |  | 2

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