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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months $ 1,275,903 $ 194,146
Gross Unrealized Holding Losses, Less Than 12 Months 49,058 1,109
Fair Value, 12 Months or Longer 89,647 70,017
Gross Unrealized Holding Losses, 12 Months or Longer 5,564 859
Fair Value 1,365,550 264,163
Gross Unrealized Holding Losses 54,622 1,968
Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 267,936 51,134
Gross Unrealized Holding Losses, Less Than 12 Months 20,514 248
Fair Value, 12 Months or Longer 38,563   
Gross Unrealized Holding Losses, 12 Months or Longer 3,361   
Fair Value 306,499 51,134
Gross Unrealized Holding Losses 23,875 248
Residential mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 851,621 55,118
Gross Unrealized Holding Losses, Less Than 12 Months 23,313 127
Fair Value, 12 Months or Longer 22,999   
Gross Unrealized Holding Losses, 12 Months or Longer 1,475   
Fair Value 874,620 55,118
Gross Unrealized Holding Losses 24,788 127
CMO/REMICs [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 104,322 74,784
Gross Unrealized Holding Losses, Less Than 12 Months 1,780 572
Fair Value, 12 Months or Longer 17,747 69,042
Gross Unrealized Holding Losses, 12 Months or Longer 194 838
Fair Value 122,069 143,826
Gross Unrealized Holding Losses 1,974 1,410
Municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 47,116 13,110
Gross Unrealized Holding Losses, Less Than 12 Months 3,359 162
Fair Value, 12 Months or Longer 10,338 975
Gross Unrealized Holding Losses, 12 Months or Longer 534 21
Fair Value 57,454 14,085
Gross Unrealized Holding Losses 3,893 183
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