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, 2018
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]      
Demand – interest-bearing $ 106 $ 74 $ 75
Money market and savings 16,182 12,515 6,470
Time deposits of $100,000 or more 24,309 10,471 6,605
Other time deposits 2,483 3,029 3,420
Total interest expense on deposits $ 43,080 $ 26,089 $ 16,570