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Derivatives and Hedging Activities (Textual) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |  |
Derivative, Net Liability Position, Aggregate Fair Value |  | $ 34,000 |  | $ 34,000 |  | $ 4,200,000
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge |  |  |  | 5 years |  |
Gain (Loss) on Sales of Loans, Net |  | 1,100,000 | $ 1,400,000 | $ 2,600,000 | $ 3,400,000 |
Exposure to Institutional Counterparties |  | 27,300,000 |  | 27,300,000 |  | 7,100,000
Amortization Of Deferred Hedge Gains Losses |  | 61,000 | 61,000 | 183,000 | 183,000 |
Customer related positions |  | 1,500,000 |  | 1,500,000 |  | 9,500,000
Notional amount of fair value hedged derivative |  | 0 |  | 0 |  | $ 0
Change in Fair Value on Loans Held for Sale |  | $ 103,000 | $ (108,000) | $ 147,000 | $ (102,000) |
Position thirteen [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Cap Interest Rate |  | 3.09% |  | 3.09% |  |
Derivative, Floor Interest Rate |  | 2.75% |  | 2.75% |  |
Derivative, Trade Date | [1] |  |  | Sep. 24, 2018 |  |
Effective Date | [1] |  |  | Oct. 15, 2018 |  |
Derivative, Maturity Date | [1] |  |  | Apr. 15, 2023 |  |
Derivative, Notional Amount | [1] | $ 50,000,000 |  | $ 50,000,000 |  |
Interest Income [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | 17,000 |  |
Interest Expense [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | $ 912,000 |  |
[1] | In September 2018, the Company entered into a forward-starting interest rate collar with a notional amount of $50.0 million, with the intention of hedging against adverse fluctuations in interest rates by reducing its exposure to variability in cash flows relating to interest income on the Company's variable-rate loans.

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