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Analysis of Contractual Maturities of Outstanding Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amount    
Repurchase agreements $ 500,000 $ 450,000
Weighted Average Interest Rate    
Contractual Maturity Over 90 days, Weighted Average Interest Rate 2.10%  
Earlier of Contractual Maturity or Next Call Date [Member]    
Amount    
2019 $ 200,000  
2021 300,000  
Repurchase agreements $ 500,000  
Weighted Average Interest Rate    
2019 1.69%  
2021 2.37%  
Contractual Maturity Over 90 days, Weighted Average Interest Rate 2.10%  
Contractual Maturity    
Amount    
2019 $ 200,000  
2028 300,000  
Repurchase agreements $ 500,000  
Weighted Average Interest Rate    
2019 1.69%  
2028 2.37%  
Contractual Maturity Over 90 days, Weighted Average Interest Rate 2.10%