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Derivative Financial Instruments - Free-Standing (Details)
$ in Thousands
12 Months Ended 96 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Oct. 31, 2019
USD ($)
Sep. 30, 2019
Sep. 27, 2019
Jul. 31, 2018
USD ($)
Jul. 05, 2018
Jun. 28, 2018
Dec. 31, 2017
Minimum                        
Derivative financial instruments                        
Derivative, Floating rate 0.15%                      
Maximum                        
Derivative financial instruments                        
Derivative, Floating rate 3.16%                      
Visa | Class B restricted shares                        
Derivative financial instruments                        
Estimated amount that was subsequently paid to the buyer           $ 300            
Number of shares sold | shares       274,000 0              
Other noninterest income | Visa                        
Derivative financial instruments                        
Loss related to a revaluation adjustment to increase the fair value $ 4,800 $ 4,500                    
Interest rate swaps | Customer swap program                        
Derivative financial instruments                        
Notional Amount 3,000,000                      
Funding Swap (Visa Derivative) | Class B restricted shares                        
Derivative financial instruments                        
Conversion rate             1.6228 1.6228   1.6298 1.6298 1.6483
Funding Swap (Visa Derivative) | Visa                        
Derivative financial instruments                        
Conversion rate             1.6228 1.6298   1.6298 1.6483  
Estimated amount that was subsequently paid to the buyer                 $ 700      
Funding Swap (Visa Derivative) | Included in other liabilities                        
Derivative financial instruments                        
Derivative liability value 4,600 4,200                    
Derivatives Not Designated as Hedging Instruments | Interest rate swaps                        
Derivative financial instruments                        
Notional Amount 3,002,333 2,818,803                    
Net interest expense on derivative $ 0 $ 0 $ 500                  
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Minimum                        
Derivative financial instruments                        
Fixed interest rate (as a percent) 2.02% 1.71%                    
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Maximum                        
Derivative financial instruments                        
Fixed interest rate (as a percent) 5.78% 8.73%                    
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Customer swap program                        
Derivative financial instruments                        
Positive fair value, derivative asset $ 129,900 $ 63,500                    
Negative fair value, derivative liability 0                    
Upfront fees on the dealer swap 8,300 4,500 $ 7,300                  
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets                        
Derivative financial instruments                        
Positive fair value, derivative asset 129,888 63,527                    
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)                        
Derivative financial instruments                        
Notional Amount 92,647 82,900                    
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities                        
Derivative financial instruments                        
Negative fair value, derivative liability $ 4,554 $ 4,233