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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months $ 452,172 $ 1,275,903
Gross Unrealized Holding Losses, Less Than 12 Months 843 49,058
Fair Value, 12 Months or Longer 693,499 89,647
Gross Unrealized Holding Losses, 12 Months or Longer 22,049 5,564
Fair Value 1,145,671 1,365,550
Gross Unrealized Holding Losses 22,892 54,622
Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 17,979 267,936
Gross Unrealized Holding Losses, Less Than 12 Months 37 20,514
Fair Value, 12 Months or Longer 306,211 38,563
Gross Unrealized Holding Losses, 12 Months or Longer 13,326 3,361
Fair Value 324,190 306,499
Gross Unrealized Holding Losses 13,363 23,875
Residential mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 399,364 851,621
Gross Unrealized Holding Losses, Less Than 12 Months 677 23,313
Fair Value, 12 Months or Longer 309,465 22,999
Gross Unrealized Holding Losses, 12 Months or Longer 7,273 1,475
Fair Value 708,829 874,620
Gross Unrealized Holding Losses 7,950 24,788
CMOs / REMICs - residential [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 28,420 104,322
Gross Unrealized Holding Losses, Less Than 12 Months 76 1,780
Fair Value, 12 Months or Longer 42,092 17,747
Gross Unrealized Holding Losses, 12 Months or Longer 567 194
Fair Value 70,512 122,069
Gross Unrealized Holding Losses 643 1,974
Municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 6,409 47,116
Gross Unrealized Holding Losses, Less Than 12 Months 53 3,359
Fair Value, 12 Months or Longer 35,731 10,338
Gross Unrealized Holding Losses, 12 Months or Longer 883 534
Fair Value 42,140 57,454
Gross Unrealized Holding Losses 936 3,893
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 0 4,908
Gross Unrealized Holding Losses, Less Than 12 Months 0 92
Fair Value, 12 Months or Longer 0 0
Gross Unrealized Holding Losses, 12 Months or Longer 0 0
Fair Value 0 4,908
Gross Unrealized Holding Losses $ 0 $ 92