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Income Taxes (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 21, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 18,000 |  |
Income tax expense (benefit), intraperiod tax allocation |  | $ 14,522 | $ 14,802 | $ 12,657
Reduction in net deferred tax liability |  |  |  | $ 400
Effective tax rate, Statutory federal tax | 35.00% | 21.00% | 21.00% | 35.00%
Income tax expense |  | $ 14,447 | $ 14,759 | $ 12,605
Estimated Tax Act impact on earnings per common share |  |  |  | $ 0.04
Effective tax rate, Share-based compensation |  | (7.00%) | (2.60%) | (3.00%)
Maryland State [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Operating loss carryforwards expiration year |  | 2030 |  |

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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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