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Deposits (Tables) | 12 Months Ended
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Dec. 31, 2018
Banking and Thrift [Abstract] |
Summary of Deposits Including Accrued Interest Payable | Deposits, including accrued interest payable of $430,000 at December 31, 2018 and $22,000 at December 31, 2017, are summarized as follows (in thousands):
|  | December 31,
|  | 2018 |  | 2017
|  | Amount |  | Weighted Average Cost |  | Amount |  | Weighted Average Cost
Non-interest-bearing accounts |  | $ | 1,151,362 |  |  | — | % |  | $ | 756,513 |  |  | — | %
Interest-bearing checking accounts |  | 2,350,106 |  |  | 0.51 |  |  | 1,954,358 |  |  | 0.32 |
Money market deposit accounts |  | 569,680 |  |  | 0.66 |  |  | 363,656 |  |  | 0.33 |
Savings accounts |  | 877,177 |  |  | 0.12 |  |  | 661,167 |  |  | 0.04 |
Time deposits |  | 866,244 |  |  | 1.50 |  |  | 607,104 |  |  | 1.18 |
Total deposits |  | $ | 5,814,569 |  |  | 0.51 | % |  | $ | 4,342,798 |  |  | 0.34 | %
Summary of Time Deposits by Maturity | Time deposits at December 31, 2018 mature as follows (in thousands):
For the Year Ended December 31, | Time Deposit Maturities
2019 | $ | 438,735 |
2020 | 170,575 |
2021 | 140,463 |
2022 | 79,619 |
2023 | 35,260 |
Thereafter | 1,592 |
Total | $ | 866,244 |
Summary of Interest Expense on Deposits | Interest expense on deposits for the years ended December 31, 2018, 2017 and 2016 is as follows (in thousands):
|  | For the Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Interest-bearing checking accounts |  | $ | 9,219 |  |  | $ | 4,533 |  |  | $ | 2,114 |
Money market deposit accounts |  | 2,818 |  |  | 1,213 |  |  | 858 |
Savings accounts |  | 990 |  |  | 345 |  |  | 191 |
Time deposits |  | 9,551 |  |  | 6,245 |  |  | 4,354 |
Total interest expense on deposits |  | $ | 22,578 |  |  | $ | 12,336 |  |  | $ | 7,517 |

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