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Deposits - Total deposits - (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits Abstract    
Certificates of deposit $ 1,092,750 $ 1,237,140
Interest-bearing demand deposits 3,293,942 2,927,820
Non-interest bearing demand deposits 1,976,480 1,639,953
Savings deposits 735,961 655,132
Other time deposits 1,295 1,000
Total deposits $ 7,100,428 $ 6,461,045