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Investment Securities - Schedule of Securities in Other Assets on Company's Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Federal Home Loan Bank (FHLB) stock $ 92,333 $ 95,171
Federal Reserve Bank Stock 85,630 79,191
CRA and Community Development Investment Funds 1,878 0
Other Investments 9,938 3,008
Marketable Securities, Equity Securities $ 189,779 $ 177,370