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Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of Fair Value on a non-recurring basis - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Fair Value | $ 1,094 | $ 1,099
Valuation Technique | Appraisals of collateral value | Appraisals of collateral value
Unobservable Inputs | Comparable sales | Comparable sales
Impaired Loans [Member] | Commercial Real Estate [Member] | Appraisals Of Collateral Valuation Technique [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Capitalization rate | 5.00% | 6.00%
Impaired Loans [Member] | Commercial Real Estate [Member] | Appraisals Of Collateral Valuation Technique [Member] | Minimum [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Capitalization rate | 0.00% | 0.00%
Impaired Loans [Member] | Commercial Real Estate [Member] | Appraisals Of Collateral Valuation Technique [Member] | Maximum [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Capitalization rate | 10.00% | 15.00%
Loans held-for-sale [Member] | Market approach [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Valuation Technique |  | Market approach (70%)
Unobservable Inputs |  | Indications under securitized transactions expressed as a price to unpaid principal balance
Loans held-for-sale [Member] | Commercial Real Estate [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Fair Value |  | $ 7,712
Loans held-for-sale [Member] | Commercial taxi medallion loans [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Fair Value |  | $ 65,596
Valuation Technique |  | Discounted cash flows (30%)
Purchase amount per medallion |  | $ 59
Discounted Rate |  | 14.00%
Loans held-for-sale [Member] | Commercial taxi medallion loans [Member] | Minimum [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Purchase amount per medallion |  | $ 40
Loans held-for-sale [Member] | Commercial taxi medallion loans [Member] | Maximum [Member] |  |
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items] |  |
Purchase amount per medallion |  | $ 100

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