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Summary of Significant Accounting Policies (Details Narrative) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) Number | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Number | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) Number $ / shares | Dec. 31, 2016 USD ($) Number | Dec. 31, 2015 USD ($)
Income tax expense (benefit) | $ | $ 35,396 | $ 17,409 | $ 17,382 | $ 15,318 | $ 16,429 | $ 15,484 | $ 15,069 | $ 14,413 | $ 13,485 | $ 13,054 | $ 12,776 | $ 11,734 | $ 85,504 | $ 61,395 | $ 51,049
Risk Level, High [Member] | Eagle Commercial Ventures, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of higher risk lending transactions outstanding | Number | 3 |  |  |  | 3 |  |  |  |  |  |  |  | 3 | 3 |
Loans receivable, net | $ | $ 7,700 |  |  |  | $ 9,300 |  |  |  |  |  |  |  | $ 7,700 | $ 9,300 |
Banking Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | Number | 30 |  |  |  |  |  |  |  |  |  |  |  | 30 |  |
Lending Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | Number | 5 |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 460 |  |
Earnings per share, basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Days from commitment to closing |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Days from commitment to closing |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Maximum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |

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