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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 605,224 $ 321,673
Other comprehensive income (loss) (239) 88
Ending Balance 625,406 552,388
Unrealized Net Gains and (Losses) on Securities Available-for-Sale    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (612) (224)
Other comprehensive income (loss), before reclassifications (249) 88
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of ($61) (1) 178 0
Other comprehensive income (loss) (71) 88
Ending Balance (683) (136)
Other comprehensive income (loss), before reclassifications, tax 97 (54)
Reclassification from AOCI, tax (61)  
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 12 0
Other comprehensive income (loss), before reclassifications 10  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of ($61) (1) 0 0
Other comprehensive income (loss) 10 0
Ending Balance 22 $ 0
Other comprehensive income (loss), before reclassifications, tax $ 4