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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt securities available for sale:    
Due in one year or less $ 9,830  
Due after one year through five years 43,459  
Due after five years through ten years 5,328  
Due after ten years 170,594  
Total available for sale (amortized cost) 229,211  
Mortgage-backed securities available for sale 5,723,183  
Total 5,952,394  
Debt securities held to maturity:    
Due in one year or less 17,944  
Due after one year through five years 74,928  
Due after five years through ten years 70,022  
Due after ten years 8,656  
Total available for held to maturity (amortized cost) 171,550  
Mortgage-backed securities held to maturity 3,702,435  
Total 3,873,985 3,966,130
Debt securities available for sale:    
Due in one year or less 9,957  
Due after one year through five years 44,086  
Due after five years through ten years 5,442  
Due after ten years 177,562  
Total available for sale (fair value) 237,047  
Mortgage-backed securities available for sale 5,801,787  
Total 6,038,834  
Debt securities held to maturity:    
Due in one year or less 18,049  
Due after one year through five years 76,540  
Due after five years through ten years 71,391  
Due after ten years 8,656  
Total available for held to maturity (fair value) 174,636  
Mortgage-backed securities held to maturity 3,640,130  
Estimated fair value for held to maturity $ 3,814,766 $ 3,860,127