XML 28 R34.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment [Line Items]    
Fair Value, Less Than 12 Months $ 926,016 $ 194,146
Gross Unrealized Holding Losses, Less Than 12 Months 40,597 1,109
Fair Value, 12 Months or Longer 29,093 70,017
Gross Unrealized Holding Losses, 12 Months or Longer 548 859
Fair Value 955,109 264,163
Gross Unrealized Holding Losses 41,145 1,968
Government agency [Member]
    
Investment [Line Items]    
Fair Value, Less Than 12 Months 312,948 51,134
Gross Unrealized Holding Losses, Less Than 12 Months 20,603 248
Fair Value 312,948 51,134
Gross Unrealized Holding Losses 20,603 248
Residential mortgage-backed securities [Member]
    
Investment [Line Items]    
Fair Value, Less Than 12 Months 473,190 55,118
Gross Unrealized Holding Losses, Less Than 12 Months 16,073 127
Fair Value 473,190 55,118
Gross Unrealized Holding Losses 16,073 127
CMO/REMICs [Member]
    
Investment [Line Items]    
Fair Value, Less Than 12 Months 92,281 74,784
Gross Unrealized Holding Losses, Less Than 12 Months 988 572
Fair Value, 12 Months or Longer 18,700 69,042
Gross Unrealized Holding Losses, 12 Months or Longer 74 838
Fair Value 110,981 143,826
Gross Unrealized Holding Losses 1,062 1,410
Municipal bonds [Member]
    
Investment [Line Items]    
Fair Value, Less Than 12 Months 42,859 13,110
Gross Unrealized Holding Losses, Less Than 12 Months 2,671 162
Fair Value, 12 Months or Longer 10,393 975
Gross Unrealized Holding Losses, 12 Months or Longer 474 21
Fair Value 53,252 14,085
Gross Unrealized Holding Losses 3,145 183
Other Securities [Member]
    
Investment [Line Items]    
Fair Value, Less Than 12 Months 4,738  
Gross Unrealized Holding Losses, Less Than 12 Months 262  
Fair Value 4,738  
Gross Unrealized Holding Losses $ 262