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Commitments and Contingencies - Schedule of Commitments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total unfunded off-balance sheet credit risk $ 1,364,114 $ 737,572
Commitments to Extend Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total unfunded off-balance sheet credit risk 1,342,271 737,572
Standby Letters of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total unfunded off-balance sheet credit risk 343 0
Purchase Commitment    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total unfunded off-balance sheet credit risk $ 21,500 $ 0