Annual report pursuant to Section 13 and 15(d)

Deposits - Additional Information (Detail)

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Deposits - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Accrued interest payable on deposits $ 11.4 $ 5.3
Total deposits reclassified to loans due to overdrafts $ 1.5 $ 1.5