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Deposits (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Schedule of deposit composition and average interest rates | The following table provides information regarding the Bank’s deposit composition at December 31, 2017, 2016, and 2015 as well as the average rate being paid on interest bearing deposits at December 31, 2017, 2016, and 2015.
|  | 2017 |  | 2016 |  | 2015 |
|  |  |  | Average |  |  |  | Average |  |  |  | Average |
(dollars in thousands) |  | Balance |  | Rate |  | Balance |  | Rate |  | Balance |  | Rate |
Noninterest bearing demand |  | $ | 1,982,912 |  | — |  | $ | 1,775,684 |  | — |  | $ | 1,405,067 |  | — |
Interest bearing transaction |  | 420,417 |  | 0.46 | % | 289,122 |  | 0.16 | % | 178,797 |  | 0.16 | %
Savings and money market |  | 2,621,146 |  | 0.70 | % | 2,902,560 |  | 0.54 | % | 2,835,325 |  | 0.34 | %
Time, $100,000 or more |  | 515,682 |  | 1.20 | % | 464,842 |  | 0.95 | % | 406,570 |  | 0.77 | %
Other time |  | 313,827 |  | 1.17 | % | 283,906 |  | 0.86 | % | 332,685 |  | 0.74 | %
Total |  | $ | 5,853,984 |  |  |  | $ | 5,716,114 |  |  |  | $ | 5,158,444 |
Schedule of maturity of time deposits | The remaining maturity of time deposits at December 31, 2017, 2016 and 2015 are as follows:
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015 |
Three months or less |  | $ | 180,459 |  | $ | 120,238 |  | $ | 88,483 |
More than three months through six months |  | 228,513 |  | 151,422 |  | 123,789 |
More than six months through twelve months |  | 208,554 |  | 207,141 |  | 234,684 |
Over twelve months |  | 211,983 |  | 269,947 |  | 292,299 |
Total |  | $ | 829,509 |  | $ | 748,748 |  | $ | 739,255 |
Schedule of interest expense on deposits | Interest expense on deposits for the years ended December 31, 2017, 2016 and 2015 is as follows:
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015 |
Interest bearing transaction |  | $ | 1,537 |  | $ | 646 |  | $ | 291 |
Savings and money market |  | 17,284 |  | 12,038 |  | 8,185 |
Time, $100,000 or more |  | 7,294 |  | 6,487 |  | 5,019 |
Other time |  | 1,171 |  | 77 |  | 848 |
Total |  | $ | 27,286 |  | $ | 19,248 |  | $ | 14,343 |

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