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Deposits (Scheduled Maturities) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Scheduled maturities of time deposits    
2016 $ 2,127,790,000  
2017 170,950,000  
2018 46,317,000  
2019 19,305,000  
2020 1,986,000  
Thereafter 65,000  
Total time, certificates of deposit 2,366,413,000 $ 2,482,692,000
Time Deposits 250,000 or exceed 1,021,000 $ 1,027,000
Scheduled maturities of time deposits in amounts of $100,000 or more    
Due within 3 months or less 682,567,000  
Due after 3 months and within 6 months 416,167,000  
Due after 6 months and within 12 months 398,985,000  
Due after 12 months 151,985,000  
Total $ 1,649,704,000