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Derivative Financial Instruments - Pre-tax Impact of Terminated Cash Flow Hedges on AOCI (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
AOCI Attributable to Parent, Before Tax [Roll Forward]  
Beginning Balance $ 3,428,052
Unrealized gains on terminated hedges arising during the period 0
Reclassification adjustments for amortization of unrealized (gains) into net interest income (8,274)
Ending balance 3,387,045
Accumulated Gain (Loss), Net, Terminated Cash Flow Hedge, Parent  
AOCI Attributable to Parent, Before Tax [Roll Forward]  
Beginning Balance 41,473
Ending balance $ 33,199