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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months $ 753,839 $ 1,275,903
Gross Unrealized Holding Losses, Less Than 12 Months 15,308 49,058
Fair Value, 12 Months or Longer 357,003 89,647
Gross Unrealized Holding Losses, 12 Months or Longer 21,418 5,564
Fair Value 1,110,842 1,365,550
Gross Unrealized Holding Losses 36,726 54,622
Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 143,534 267,936
Gross Unrealized Holding Losses, Less Than 12 Months 6,842 20,514
Fair Value, 12 Months or Longer 164,282 38,563
Gross Unrealized Holding Losses, 12 Months or Longer 11,744 3,361
Fair Value 307,816 306,499
Gross Unrealized Holding Losses 18,586 23,875
Residential mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 542,041 851,621
Gross Unrealized Holding Losses, Less Than 12 Months 7,062 23,313
Fair Value, 12 Months or Longer 148,952 22,999
Gross Unrealized Holding Losses, 12 Months or Longer 8,353 1,475
Fair Value 690,993 874,620
Gross Unrealized Holding Losses 15,415 24,788
CMO's / REMIC's - residential [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 52,196 104,322
Gross Unrealized Holding Losses, Less Than 12 Months 539 1,780
Fair Value, 12 Months or Longer 15,693 17,747
Gross Unrealized Holding Losses, 12 Months or Longer 24 194
Fair Value 67,889 122,069
Gross Unrealized Holding Losses 563 1,974
Municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 16,068 47,116
Gross Unrealized Holding Losses, Less Than 12 Months 865 3,359
Fair Value, 12 Months or Longer 28,076 10,338
Gross Unrealized Holding Losses, 12 Months or Longer 1,297 534
Fair Value 44,144 57,454
Gross Unrealized Holding Losses 2,162 3,893
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months    4,908
Gross Unrealized Holding Losses, Less Than 12 Months    92
Fair Value, 12 Months or Longer      
Gross Unrealized Holding Losses, 12 Months or Longer      
Fair Value    4,908
Gross Unrealized Holding Losses    $ 92