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Fair Value of Financial Instruments Fair Value - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | $ 340,411 | $ 300,200 | $ 315,459
Equity Securities | 1,916 | 0 | 0
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 340,411 |  |
Equity Securities | 1,916 |  |
Total Securities Measured on a Recurring Basis | 342,327 |  |
Securities Available-for-Sale |  | 300,200 | 315,459
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Equity Securities | 0 |  |
Total Securities Measured on a Recurring Basis | 0 |  |
Securities Available-for-Sale |  | 0 | 64,730
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 340,411 |  |
Equity Securities | 1,916 |  |
Total Securities Measured on a Recurring Basis | 342,327 |  |
Securities Available-for-Sale |  | 300,200 | 250,729
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Equity Securities | 0 |  |
Total Securities Measured on a Recurring Basis | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans |  | 0 |
Gain (Loss) on Collateral Dependent Impaired Loans |  | 0 |
Other Real Estate and Repossessed Assets, Net | 1,220 | 1,847 | 1,713
Gain (Loss) Other Real Estate and Repossessed Assets, Net | (559) | (569) | (655)
Fair Value, Measurements, Nonrecurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans |  | 0 |
Other Real Estate and Repossessed Assets, Net | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans |  | 0 |
Other Real Estate and Repossessed Assets, Net | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans |  | 0 |
Other Real Estate and Repossessed Assets, Net | 1,220 | 1,847 | 1,713
U.S. Agency Obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 59,602 | 59,894 | 146,978
U.S. Agency Obligations | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 59,602 |  |
Securities Available-for-Sale |  | 59,894 | 146,978
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 64,730
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 59,602 |  |
Securities Available-for-Sale |  | 59,894 | 82,248
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
State and Municipal Obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 2,548 | 10,349 | 11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 2,548 |  |
Securities Available-for-Sale |  | 10,349 | 11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
State and Municipal Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 2,548 |  |
Securities Available-for-Sale |  | 10,349 | 11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 277,461 |  |
Securities Available-for-Sale |  | 227,596 | 152,806
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 277,461 |  |
Securities Available-for-Sale |  | 227,596 | 152,806
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Corporate and Other Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 800 | 800 | 2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 800 |  |
Securities Available-for-Sale |  | 800 | 2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 800 |  |
Securities Available-for-Sale |  | 800 | 2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 |  |
Securities Available-for-Sale |  | 0 | 0
Mutual Funds and Equity Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-Sale | 0 | 1,561 | 1,474
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity Securities |  |  | 1,474
Securities Available-for-Sale |  | 1,561 |
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity Securities |  |  | 0
Securities Available-for-Sale |  | 0 |
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity Securities |  |  | 1,474
Securities Available-for-Sale |  | 1,561 |
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity Securities |  |  | 0
Securities Available-for-Sale |  | $ 0 |
Collateral Pledged | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans | 857 |  | 1,502
Gain (Loss) on Collateral Dependent Impaired Loans | (58) |  | (138)
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Quoted Prices In Active Markets for Indentical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans | 0 |  | 0
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans | 0 |  | 0
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans | $ 857 |  | $ 1,502

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