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Deposits (Scheduled Maturities) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Scheduled maturities of time deposits    
2017 $ 2,021,655,000  
2018 156,078,000  
2019 52,777,000  
2020 17,064,000  
2021 638,000  
Thereafter 98,000  
Total time, certificates of deposit 2,248,310,000 $ 2,366,413,000
Time Deposits 250,000 or exceed 1,005,000 $ 1,021,000
Scheduled maturities of time deposits in amounts of $100,000 or more    
Due within 3 months or less 605,093,000  
Due after 3 months and within 6 months 390,668,000  
Due after 6 months and within 12 months 430,447,000  
Due after 12 months 160,057,000  
Total $ 1,586,265,000