Annual report pursuant to Section 13 and 15(d)

Deposits - Summary of Interest Expense on Deposits (Detail)

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Deposits - Summary of Interest Expense on Deposits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]      
Demand – interest-bearing $ 74 $ 75 $ 114
Money market and savings 12,515 6,470 4,195
Time deposits of $100,000 or more 10,471 6,605 6,639
Other time deposits 3,029 3,420 4,462
Total interest expense on deposits $ 26,089 $ 16,570 $ 15,410