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Investment Securities Held to Maturity - Securities Held to Maturity by Contractual Maturity (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Due in one year or less, amortized cost $ 7,123
Due after one year through five years, amortized cost 67,352
Due after five years through ten years, amortized cost 260,937
Due after ten years, amortized cost 141,858
Amortized cost 477,270
Due in one year or less, fair value 7,147
Due after one year through five years, fair value 67,915
Due after five years through ten years, fair value 265,279
Due after ten years, fair value 144,302
Fair value $ 484,643