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Goodwill, Core Deposit Intangible and Other Intangible Assets - Summary of Changes in Goodwill and Core Deposit Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Goodwill And Intangible Assets [Line Items]      
Beginning balance, Goodwill $ 51,975 $ 25,688 $ 25,613
Additions   26,287 75
Ending balance, Goodwill 51,975 51,975 25,688
Amortization or accretion (3,074) (3,003) (2,980)
Core Deposits      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Beginning balance 19,776 22,275 25,245
Additions   486  
Amortization or accretion (3,056) (2,985) (2,970)
Ending balance 16,720 19,776 22,275
Accumulated amortization or accretion $ 13,466 $ 10,410 $ 7,425
Weighted average remaining amortization or accretion period 5 years 7 months 6 days 6 years 7 months 6 days 7 years 6 months