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Cash Due from Banks Interest-Bearing Deposits and Federal Funds Sold - Summary of Average Amount of Required Reserves (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Average Amount Of Required Reserves [Abstract]    
Vault cash and funds on deposit with the Federal Reserve Bank $ 1,639,058 $ 1,754,956
Average required Reserves $ 44,485 $ 41,968