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Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost $ 1,518,060 $ 1,453,355
Securities Held To Maturity, Gross Unrealized Gains 18,719 23,145
Securities Held To Maturity, Gross Unrealized Losses (10,739) (8,242)
Securities held to maturity, fair value 1,526,040 1,468,258
U.S. Treasury [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 500 502
Securities Held To Maturity, Gross Unrealized Gains 152 168
Securities held to maturity, fair value 652 670
U.S. Government-Sponsored Entities [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 146,561 101,602
Securities Held To Maturity, Gross Unrealized Gains 1,054 885
Securities Held To Maturity, Gross Unrealized Losses (379) (524)
Securities held to maturity, fair value 147,236 101,963
Agency Mortgage-Backed Securities [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 670,817 677,169
Securities Held To Maturity, Gross Unrealized Gains 12,981 16,712
Securities Held To Maturity, Gross Unrealized Losses (1,006) (346)
Securities held to maturity, fair value 682,792 693,535
Agency Collateralized Mortgage Obligations [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 484,832 501,965
Securities Held To Maturity, Gross Unrealized Gains 2,351 1,858
Securities Held To Maturity, Gross Unrealized Losses (6,793) (7,329)
Securities held to maturity, fair value 480,390 496,494
Non-Agency Collateralized Mortgage Obligations [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 3,375 4,285
Securities Held To Maturity, Gross Unrealized Gains 14 28
Securities Held To Maturity, Gross Unrealized Losses (3)  
Securities held to maturity, fair value 3,386 4,313
Commercial Mortgage-Backed Securities [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 17,410 17,560
Securities Held To Maturity, Gross Unrealized Gains 231 179
Securities held to maturity, fair value 17,641 17,739
States of the U.S. and Political Subdivisions [Member]    
Investment Securities Held To Maturity [Line Items]    
Securities Held To Maturity, Amortized Cost 194,565 150,272
Securities Held To Maturity, Gross Unrealized Gains 1,936 3,315
Securities Held To Maturity, Gross Unrealized Losses (2,558) (43)
Securities held to maturity, fair value $ 193,943 $ 153,544