v3.8.0.1
Segment Reporting - Key Operating Results of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Interest income $ 43,319 $ 30,360
Interest expense 9,051 4,302
Net interest income 34,268 26,058
Provision for loan losses 1,688 69
Noninterest income 8,982 7,783
Noninterest expense 28,988 24,709
Income before taxes on income 12,574 9,063
Operating Segments | Banking    
Segment Reporting Information [Line Items]    
Interest income 43,319 30,360
Interest expense 8,520 4,277
Net interest income 34,799 26,083
Provision for loan losses 1,688 69
Noninterest income 2,557 2,516
Noninterest expense 21,811 18,331
Income before taxes on income 13,857 10,199
Operating Segments | Wealth Management    
Segment Reporting Information [Line Items]    
Noninterest income 6,414 5,457
Noninterest expense 5,817 5,190
Income before taxes on income 597 267
Other    
Segment Reporting Information [Line Items]    
Interest expense 531 25
Net interest income (531) (25)
Noninterest income 11 (190)
Noninterest expense 1,360 1,188
Income before taxes on income $ (1,880) $ (1,403)