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Borrowed Funds - Scheduled FHLB Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Due in one year or less $ 389,375  
Due after one year through two years 436,551  
Due after two years through three years 249,169  
Due after three years through four years 42,240  
Due after four years through five years 10,000  
Thereafter 0  
Total FHLB advances $ 1,127,335 $ 1,295,080