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Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of deposits    
Noninterest-bearing deposits $ 1,278,337 $ 919,872
Interest-bearing demand deposits 2,945,438 2,255,954
Savings deposits 499,536 356,440
Time deposits 1,495,291 1,306,152
Total deposits $ 6,218,602 $ 4,838,418