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Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) in OCI on derivatives (effective portion), net of tax | $ 680 | $ (477) | $ (573)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax | (2,520) | (2,828) | (3,662)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax |  |  | 1,122
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Tax | (1,030) | (1,152) | (1,496)
Derivatives designated as hedges: [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) in OCI on derivatives (effective portion), net of tax | 2,170 | 1,199 | 2,256
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax |  | (2,828) | (3,662)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax |  |  | (1,122)
Derivatives not designated as hedges: [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other income | (44) | (43) | 108
Other Expense [Member] | Derivatives not designated as hedges: [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other income | (82) | (53) | (4)
Other Income [Member] | Derivatives not designated as hedges: [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other income | 73 | 60 | 63
Mortgage banking income | Derivatives not designated as hedges: [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Increase Decrease In Fair Value Of Unhedged Derivative Instruments Relating To Residential Loans | $ (35) | $ (50) | $ 49

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- Definition The increase (decrease) during the period, which was recognized in earnings, in the unrealized gains or losses on derivative instruments relating to residential loans that are not or are no longer designated as hedging instruments. + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges resulting from a termination. + References No definition available. + Details
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