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Deposits - Total deposits - (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deposits Disclosure Abstract    
Certificates of deposit $ 872,773 $ 1,092,750
Interest-bearing demand deposits 3,461,004 3,293,942
Non-interest bearing demand deposits 2,199,046 1,976,480
Savings deposits 799,615 735,961
Other time deposits 1,985 1,295
Total deposits $ 7,334,423 $ 7,100,428