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Fair Value Measurements - Summary of fair value measurements on recurring and non-recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Recurring: |  |
Investment securities available for sale, at fair value | $ 89,349 | $ 94,606
Non-recurring: |  |
OREO | 114 | 114
Assets, fair value disclosure | 93,074 | 99,237
Level 2 |  |
Non-recurring: |  |
Assets, fair value disclosure | 89,511 | 94,720
Level 3 |  |
Non-recurring: |  |
Assets, fair value disclosure | 3,562 | 4,517
U.S. Treasury securities |  |
Recurring: |  |
Investment securities available for sale, at fair value | 1,493 | 1,506
Municipal securities |  |
Recurring: |  |
Investment securities available for sale, at fair value | 35,633 | 33,845
Recurring | U.S. Treasury securities |  |
Recurring: |  |
Investment securities available for sale, at fair value | 1,493 | 1,506
Recurring | U.S. Treasury securities | Level 2 |  |
Recurring: |  |
Investment securities available for sale, at fair value | 1,493 | 1,506
Recurring | Municipal securities |  |
Recurring: |  |
Investment securities available for sale, at fair value | 35,633 | 33,845
Recurring | Municipal securities | Level 2 |  |
Recurring: |  |
Investment securities available for sale, at fair value | 35,633 | 33,845
Recurring | Agency mortgage-backed securities |  |
Recurring: |  |
Investment securities available for sale, at fair value | 52,223 | 59,255
Recurring | Agency mortgage-backed securities | Level 2 |  |
Recurring: |  |
Investment securities available for sale, at fair value | 52,223 | 59,255
Recurring | Interest rate swap |  |
Recurring: |  |
Investment securities available for sale, at fair value | 49 |
Recurring | Interest rate swap | Level 2 |  |
Recurring: |  |
Investment securities available for sale, at fair value | 49 |
Nonrecurring |  |
Non-recurring: |  |
Maryland Financial Bank stock | 30 | 30
Impaired loans | 3,532 | 4,487
OREO | 114 | 114
Nonrecurring | Level 2 |  |
Non-recurring: |  |
OREO | 114 | 114
Nonrecurring | Level 3 |  |
Non-recurring: |  |
Maryland Financial Bank stock | 30 | 30
Impaired loans | $ 3,532 | $ 4,487

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- Definition Amount of fair value of loans and leases receivable Impaired as on the balance sheet date. + References No definition available. + Details
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- Definition Maryland Financial Bank (MFB) stock represents an equity interest in a MFB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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