Segment Reporting - Key Operating Results of Business Segments (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
|
| Segment Reporting Information [Line Items] | |||||
| Interest income | $ 34,878 | $ 26,004 | $ 98,890 | $ 72,275 | |
| Interest expense | 6,438 | 2,841 | 16,497 | 7,830 | |
| Net interest income | 28,440 | 23,163 | 82,393 | 64,445 | |
| Provision for loan losses | 701 | 1,231 | 1,862 | 2,881 | $ 4,681 |
| Noninterest income | 9,863 | 15,079 | 27,343 | 26,974 | |
| Noninterest expense | 23,393 | 21,536 | 70,315 | 60,803 | |
| Income before taxes on income | 14,209 | 15,475 | 37,559 | 27,735 | |
| Operating Segments | Banking | |||||
| Segment Reporting Information [Line Items] | |||||
| Interest income | 34,877 | 26,004 | 98,889 | 72,275 | |
| Interest expense | 6,210 | 2,841 | 16,062 | 7,830 | |
| Net interest income | 28,667 | 23,163 | 82,827 | 64,445 | |
| Provision for loan losses | 701 | 1,231 | 1,862 | 2,881 | |
| Noninterest income | 3,955 | 9,923 | 10,636 | 11,505 | |
| Noninterest expense | 17,333 | 16,134 | 51,506 | 43,746 | |
| Income before taxes on income | 14,588 | 15,721 | 40,095 | 29,323 | |
| Operating Segments | Wealth Management | |||||
| Segment Reporting Information [Line Items] | |||||
| Interest income | 1 | 1 | |||
| Net interest income | 1 | 1 | |||
| Noninterest income | 6,132 | 5,319 | 17,334 | 15,917 | |
| Noninterest expense | 5,096 | 4,697 | 15,328 | 14,536 | |
| Income before taxes on income | 1,037 | 622 | 2,007 | 1,381 | |
| Other | |||||
| Segment Reporting Information [Line Items] | |||||
| Interest expense | 228 | 435 | |||
| Net interest income | (228) | (435) | |||
| Noninterest income | (224) | (163) | (627) | (448) | |
| Noninterest expense | 964 | 705 | 3,481 | 2,521 | |
| Income before taxes on income | $ (1,416) | $ (868) | $ (4,543) | $ (2,969) | |