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Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Securities [Line Items]    
Available for Sale, Due in one year or less, Amortized Cost     
Available for Sale, Due from one to five years, Amortized Cost 209,466  
Available for Sale, Due from five to ten years, Amortized Cost 82,024  
Available for Sale, Due after ten years, Amortized Cost 7,588  
Available for Sale, with contractual maturities, Amortized Cost 299,078  
Total securities available for sale, Amortized Cost 1,285,605 1,169,482
Available for Sale, Due in one year or less, Fair Value     
Available for Sale, Due from one to five years, Fair Value 207,689  
Available for Sale, Due from five to ten years, Fair Value 80,998  
Available for Sale, Due after ten years, Fair Value 6,739  
Available for Sale, with contractual maturities, Fair Value 295,426  
Total available for sale Securities, Fair Value 1,274,070 1,141,650
Held to Maturity, Due in one year or less, Amortized Cost 2,716  
Held to Maturity, Due from one to five years, Amortized Cost 77,526  
Held to Maturity, Due from five to ten years, Amortized Cost 85,763  
Held to Maturity, Due after ten years, Amortized Cost 67,790  
Securities Held To Maturity, with contractual maturities, Amortized Cost 233,795  
Held to Maturity, with contractual maturities, Amortized Cost 1,420,446 1,199,169
Held to Maturity, Due in one year or less, Fair Value 2,766  
Held to Maturity, Due from one to five years, Fair Value 76,567  
Held to Maturity, Due from five to ten years, Fair Value 86,428  
Held to Maturity, Due after ten years, Fair Value 68,491  
Securities Held To Maturity, with contractual maturities, Fair Value 234,252  
Held to Maturity, with contractual maturities, Fair Value 1,418,994 1,189,563
Agency Mortgage-Backed Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 352,209 247,880
Total available for sale Securities, Fair Value 355,941  
Held to Maturity, with contractual maturities, Amortized Cost 725,154 628,681
Held to Maturity, with contractual maturities, Fair Value 733,866 634,930
Agency Collateralized Mortgage Obligations [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 622,060 511,098
Total available for sale Securities, Fair Value 609,752  
Held to Maturity, with contractual maturities, Amortized Cost 452,909 385,408
Held to Maturity, with contractual maturities, Fair Value 442,158 370,328
Non-Agency Collateralized Mortgage Obligations [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 1,661 1,747
Total available for sale Securities, Fair Value 1,679  
Held to Maturity, with contractual maturities, Amortized Cost 6,352 6,852
Held to Maturity, with contractual maturities, Fair Value 6,376 6,892
Commercial Mortgage-Backed Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 9,153  
Total available for sale Securities, Fair Value 9,129  
Held to Maturity, with contractual maturities, Amortized Cost 2,236 2,241
Held to Maturity, with contractual maturities, Fair Value 2,342 2,328
Equity Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 1,444 1,444
Total available for sale Securities, Fair Value 2,143  
Held to Maturity, with contractual maturities, Amortized Cost     
Held to Maturity, with contractual maturities, Fair Value