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Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax | $ 0 | $ 0
Derivatives designated as hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain reclassified from OCI into interest income or interest expense (effective portion) | 4,380 | 1,586
Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other income | (2,601) | (723)
Other expense | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other income | 6 | 22
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other income | (283) | (24)
Total | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Mortgage banking income | (2,324) | (721)
Derivatives designated as hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent | $ (6,583) | $ 22,984

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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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