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Interest-Bearing Deposits - Summary of Interest-Bearing Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Banking And Thrift [Abstract]    
Demand $ 261,996 $ 183,680
Statement and Passbook Savings 582,128 435,377
$250 and over 42,815 8,206
Certificates of Deposit: Other 173,445 192,455
Individual Retirement Accounts 51,426 23,241
Total $ 1,111,810 $ 842,959