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Securities - Summary of Gross Unrealized Losses and Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fair value, less than 12 months $ 38,323 $ 57,577
Unrealized losses, less than 12 months 539 1,101
Fair value, 12 months or more 49,148 1,635
Unrealized losses, 12 months or more 1,145 14
Total Fair Value 87,471 59,212
Total Unrealized Losses 1,684 1,115
US government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fair value, less than 12 months 14,842 6,508
Unrealized losses, less than 12 months 100 32
Fair value, 12 months or more 6,465 0
Unrealized losses, 12 months or more 57 0
Total Fair Value 21,307 6,508
Total Unrealized Losses 157 32
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fair value, less than 12 months 23,481 49,109
Unrealized losses, less than 12 months 439 1,017
Fair value, 12 months or more 40,648 1,635
Unrealized losses, 12 months or more 1,033 14
Total Fair Value 64,129 50,744
Total Unrealized Losses 1,472 1,031
Mutual fund    
Schedule of Available-for-sale Securities [Line Items]    
Fair value, less than 12 months 0 1,960
Unrealized losses, less than 12 months 0 52
Fair value, 12 months or more 2,035 0
Unrealized losses, 12 months or more 55 0
Total Fair Value 2,035 1,960
Total Unrealized Losses $ 55 $ 52