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Derivatives and Hedging Activities - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 02, 2021
Jun. 30, 2021
Jun. 17, 2021
Dec. 31, 2020
Derivative [Line Items]                
Amount of net fee income recognized in other non-interest income              
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 0.1   $ 0.1          
Derivative Instruments and Hedges, Assets 697.7   697.7         $ 0.0
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (2.3)   (2.3)         0.0
Financial Instruments 0.0   0.0         0.0
Derivative Asset, Notional Amount 1,368.8   1,368.8         901.6
Derivative Asset, Estimated Fair Value 34.1   34.1         55.3
Collateral Pledged                
Derivative [Line Items]                
Derivative, Fair Value, Net 10.7   10.7          
Financial Instruments 0.3   0.3          
Interest Rate Swap [Member]                
Derivative [Line Items]                
Derivative, Fixed Interest Rate         1.22%   1.19%  
Derivative, Notional Amount         $ 200.0   $ 500.0  
Not Designated as Hedging Instrument                
Derivative [Line Items]                
Amount of net fee income recognized in other non-interest income 0.4 $ 3.7 1.6 $ 6.4        
Amount of net gains recognized in mortgage banking revenues 1.3 (0.6) 1.7 4.4        
Interest Rate Swap [Member]                
Derivative [Line Items]                
Financial Instruments 0.0   0.0         0.0
Derivative Asset, Notional Amount 587.6   587.6         87.6
Derivative Asset, Estimated Fair Value 0.4   0.4         0.2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]                
Derivative [Line Items]                
Derivative Asset, Notional Amount 200.0   200.0         0.0
Derivative Asset, Estimated Fair Value 2.6   2.6         0.0
Interest Rate Swap [Member] | Not Designated as Hedging Instrument                
Derivative [Line Items]                
Derivative Asset, Notional Amount 854.8   854.8         799.7
Derivative Asset, Estimated Fair Value 27.5   27.5         52.0
Forward Contracts | Not Designated as Hedging Instrument                
Derivative [Line Items]                
Derivative, Fair Value, Net           $ 0.9   0.0
Derivative Asset, Notional Amount           $ 164.2   $ 0.0
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]                
Derivative [Line Items]                
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax $ 0.0 $ 0.0 $ 0.0 $ 0.0