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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Activity Related to FDIC Loss Sharing Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
FDIC Indemnification Asset [Roll Forward]    
Balance, beginning of period $ (107) $ (502)
FDIC share of recoveries, net of charge-offs 0 0
Cash paid to FDIC, net 64 519
Other 43 (124)
Balance, end of period $ 0 $ (107)