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Fair Value Measurements (Loss) Gain On Assets and Liabilities Measured On A Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financial Instrument [Line Items] |  |  |  |
Gain (Loss) On Assets and Liabilities Measured On A Recurring Basis | $ 513 | $ (211) | $ 1,569 | $ 4,713
Mortgage Loans Held for Sale [Member] |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Gain (Loss) On Assets and Liabilities Measured On A Recurring Basis | (1,383) | (64) | (66) | 4,326
Forward Sales of Mortgage Backed Securities [Member] |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Gain (Loss) On Assets and Liabilities Measured On A Recurring Basis | 2,407 | (128) | 1,447 | 241
Interest Rate Lock Commitments [Member] |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Gain (Loss) On Assets and Liabilities Measured On A Recurring Basis | (763) | 22 | 80 | 116
Whole Loan Contracts [Member] |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Gain (Loss) On Assets and Liabilities Measured On A Recurring Basis | $ 252 | $ (41) | $ 108 | $ 30

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