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Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deposits      
Noninterest bearing demand $ 2,064,367 $ 2,104,220 $ 1,982,912
Interest bearing transaction, balance 863,856 593,107 420,417
Savings and money market, balance 3,013,129 2,949,559 2,621,146
Time, $100,000 or more, balance 663,987 801,957 515,682
Other time, balance 619,052 525,442 313,827
Total deposits $ 7,224,391 $ 6,974,285 $ 5,853,984
Interest bearing transaction, average rate 0.99% 0.81% 0.46%
Savings and money market, average rate 1.42% 1.68% 0.70%
Time, $100,000 or more, average rate 2.55% 2.25% 1.20%
Other time, average rate 2.21% 2.25% 1.17%