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Derivative Financial Instruments (Net gains or losses) (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income $ 8,353 $ 8,362 $ 15,524
Interest Rate Lock Commitments | Mortgage Banking Income      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income 3,534 5,643 7,834
Forward Commitments | Mortgage Banking Income      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income 821 (1,275) 1,741
Interest Rate Swap Agreements | Other Noninterest Income      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income 1,835 698 2,987
Foreign Exchange Contracts | Other Noninterest Income      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income 3,163 3,296 2,962
Visa Conversion Rate Swap Agreement [Member] | Gain (Loss) on Investments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Gains (Losses) Recognized in the Statements of Income $ (1,000) $ 0 $ 0