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Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost $ 1,285,605 $ 1,169,482
Securities Available For Sale, Gross Unrealized Gains 7,746 11,463
Securities Available For Sale, Gross Unrealized Losses (19,281) (39,295)
Securities Available For Sale, Fair Value 1,271,927 1,139,524
Securities Available For Sale, Fair Value 2,143 2,126
Assets measured at fair value, Available for sale securities 1,274,070 1,141,650
U.S. Government-Sponsored Entities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 268,330 336,763
Securities Available For Sale, Gross Unrealized Gains 50 126
Securities Available For Sale, Gross Unrealized Losses (3,699) (5,904)
Securities Available For Sale, Fair Value 264,681 330,985
Agency Mortgage-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 352,209 247,880
Securities Available For Sale, Gross Unrealized Gains 4,637 4,304
Securities Available For Sale, Gross Unrealized Losses (905) (1,303)
Securities Available For Sale, Fair Value 355,941 250,881
Assets measured at fair value, Available for sale securities 355,941  
Agency Collateralized Mortgage Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 622,060 511,098
Securities Available For Sale, Gross Unrealized Gains 1,335 895
Securities Available For Sale, Gross Unrealized Losses (13,643) (20,794)
Securities Available For Sale, Fair Value 609,752 491,199
Assets measured at fair value, Available for sale securities 609,752  
Non-Agency Collateralized Mortgage Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 1,661 1,747
Securities Available For Sale, Gross Unrealized Gains 18 15
Securities Available For Sale, Gross Unrealized Losses      
Securities Available For Sale, Fair Value 1,679 1,762
Assets measured at fair value, Available for sale securities 1,679  
Commercial Mortgage-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 9,153  
Securities Available For Sale, Gross Unrealized Gains     
Securities Available For Sale, Gross Unrealized Losses (24)  
Securities Available For Sale, Fair Value 9,129  
Assets measured at fair value, Available for sale securities 9,129  
States of the U.S. and Political Subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 14,216 16,842
Securities Available For Sale, Gross Unrealized Gains 438 410
Securities Available For Sale, Gross Unrealized Losses (149) (250)
Securities Available For Sale, Fair Value 14,505 17,002
Collateralized Debt Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost   37,203
Securities Available For Sale, Gross Unrealized Gains   4,507
Securities Available For Sale, Gross Unrealized Losses   (10,115)
Securities Available For Sale, Fair Value   31,595
Other Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 16,532 16,505
Securities Available For Sale, Gross Unrealized Gains 569 524
Securities Available For Sale, Gross Unrealized Losses (861) (929)
Securities Available For Sale, Fair Value 16,240 16,100
Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 1,284,161 1,168,038
Securities Available For Sale, Gross Unrealized Gains 7,047 10,781
Securities Available For Sale, Gross Unrealized Losses (19,281) (39,295)
Securities Available For Sale, Fair Value 1,271,927 1,139,524
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities Available For Sale, Amortized Cost 1,444 1,444
Securities Available For Sale, Gross Unrealized Gains 699 682
Securities Available For Sale, Gross Unrealized Losses      
Securities Available For Sale, Fair Value 2,143 2,126
Assets measured at fair value, Available for sale securities $ 2,143