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Derivative Financial Instruments - Free-Standing, Contingent Features and Counterparty Credit Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 96 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Derivative financial instruments              
Counterparty credit risk adjustments       $ 100 $ 100    
Visa | Class B shares              
Derivative financial instruments              
Number of shares sold   0 274,000 0 274,000 0  
Interest rate swaps              
Derivative financial instruments              
Collateral thresholds for derivative agreements with credit risk related contingent features $ 500     $ 500      
Derivatives Not Designated as Hedging Instruments | Interest rate swaps              
Derivative financial instruments              
Notional Amount 1,611,148     1,611,148     $ 1,297,101
Net interest expense on derivative $ 200 $ 300   $ 500 $ 600    
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Minimum              
Derivative financial instruments              
Fixed interest rate (as a percent) 1.23%     1.23%     0.77%
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Maximum              
Derivative financial instruments              
Fixed interest rate (as a percent) 5.33%     5.33%     4.90%
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Customer swap program              
Derivative financial instruments              
Notional Amount $ 1,500,000     $ 1,500,000     $ 1,200,000
Upfront fees on the dealer swap 1,700 $ 1,700   4,600 $ 3,700    
Derivative asset value 19,600     19,600     16,000
Derivative liability value 13,000     13,000     16,000
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other assets              
Derivative financial instruments              
Positive fair value, derivative asset 19,581     19,581     15,982
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other liabilities              
Derivative financial instruments              
Fair value loss (derivative liability) 14,935     14,935     18,299
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)              
Derivative financial instruments              
Notional Amount 40,017     40,017     37,143
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Other liabilities              
Derivative financial instruments              
Fair value loss (derivative liability) $ 6,493     $ 6,493     $ 7,460