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Fair Value Measurements (Loss) Gain On Assets and Liabilities Measured On A Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | $ 3,745 | $ (3,223) | $ (727)
Mortgage Loans Held for Sale [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | 3,675 | (3,591) | (590)
Forward Sales or Mortgage Backed Securities [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | (53) | 323 | 89
Interest Rate Lock Commitments [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | 21 | (71) | 32
Best Efforts Contracts [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | $ 102 | $ 116 | $ (258)

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