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Investment Securities - Summary of Investment Securities by Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized Cost $ 382,978  
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, fair value 374,284 $ 93,355 [1]
US treasury securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
One to five years, amortized cost 4,965  
Amortized Cost 4,965  
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
One to five years, fair value 4,934  
Total, fair value 4,934  
US government agencies    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Within one year, amortized cost 6,510  
One to five years, amortized cost 27,088  
Amortized Cost 33,598 22,778
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Within one year, fair value 6,472  
One to five years, fair value 26,603  
Total, fair value 33,075 22,624
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
One to five years, amortized cost 3,806  
Five to ten years, amortized cost 48,752  
After 10 years, amortized cost 291,857  
Amortized Cost 344,415 70,167
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
One to five years, fair value 3,617  
Five to ten years, fair value 47,673  
After 10 years, fair value 284,985  
Total, fair value 336,275 $ 68,696
Excluding Mutual Fund    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized Cost 382,978  
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, fair value $ 374,284  
[1] Derived from audited consolidated financial statements.