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Short-Term Borrowings - Composition of Short-Term Borrowings, Interest Expense and Weighted Average Interest Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]      
Balance $ 418,086 $ 320,605 $ 173,847
Weighted Average Interest Rate 0.44% 0.27% 0.24%
Interest Expense $ 936 $ 514 $ 341
REPOs      
Short-term Debt [Line Items]      
Balance $ 62,086 $ 30,605 $ 33,847
Weighted Average Interest Rate 0.01% 0.01% 0.01%
Interest Expense $ 4 $ 3 $ 62
FHLB Advances      
Short-term Debt [Line Items]      
Balance $ 356,000 $ 290,000 $ 140,000
Weighted Average Interest Rate 0.52% 0.31% 0.30%
Interest Expense $ 932 $ 511 $ 279
Collateralized Mortgage Backed Securities      
Short-term Debt [Line Items]      
Carrying amount of mortgage back securities pledged as collateral $ 67,000 $ 35,600