Employee Stock Ownership Plan - Nonqualified ESOP Restoration Plan (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
ESOP restoration \| Certain executives
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits
Accrued (reversed) benefits	$ 350,000	$ 204,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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