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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 2,424,654 $ 2,374,816
Gross Unrealized Holding Gain 42,379 76,539
Gross Unrealized Holding Loss (35,452) (1,968)
Fair Value 2,431,581 2,449,387
Total Percent 100.00% 100.00%
Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 377,493 357,960
Gross Unrealized Holding Gain 62 1,588
Gross Unrealized Holding Loss (16,223) (248)
Fair Value 361,332 359,300
Total Percent 14.86% 14.67%
Residential mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 1,040,904 862,196
Gross Unrealized Holding Gain 11,499 25,529
Gross Unrealized Holding Loss (15,303) (127)
Fair Value 1,037,100 887,598
Total Percent 42.65% 36.24%
CMO's / REMIC's - residential [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 420,465 565,968
Gross Unrealized Holding Gain 6,159 7,402
Gross Unrealized Holding Loss (731) (1,410)
Fair Value 425,893 571,960
Total Percent 17.52% 23.35%
Municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 580,792 583,692
Gross Unrealized Holding Gain 24,659 41,920
Gross Unrealized Holding Loss (3,120) (183)
Fair Value 602,331 625,429
Total Percent 24.77% 25.53%
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 5,000 5,000
Gross Unrealized Holding Gain   100
Gross Unrealized Holding Loss (75)  
Fair Value $ 4,925 $ 5,100
Total Percent 0.20% 0.21%