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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 2,679,727 $ 2,374,816
Gross Unrealized Holding Gain 38,537 76,539
Gross Unrealized Holding Loss (54,622) (1,968)
Fair Value 2,663,642 2,449,387
Total Percent 100.00% 100.00%
Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 350,378 357,960
Gross Unrealized Holding Gain 22 1,588
Gross Unrealized Holding Loss (23,875) (248)
Fair Value 326,525 359,300
Total Percent 12.26% 14.67%
Residential mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 1,391,631 862,196
Gross Unrealized Holding Gain 13,100 25,529
Gross Unrealized Holding Loss (24,788) (127)
Fair Value 1,379,943 887,598
Total Percent 51.81% 36.24%
CMO/REMICs [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 361,573 565,968
Gross Unrealized Holding Gain 6,576 7,402
Gross Unrealized Holding Loss (1,974) (1,410)
Fair Value 366,175 571,960
Total Percent 13.75% 23.35%
Municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 571,145 583,692
Gross Unrealized Holding Gain 18,839 41,920
Gross Unrealized Holding Loss (3,893) (183)
Fair Value 586,091 625,429
Total Percent 22.00% 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 (92)  
Fair Value $ 4,908 $ 5,100
Total Percent 0.18% 0.21%