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Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 129 $ 546
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 9,471 30,364
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 129 546
Held-to-maturity Securities, Fair Value 9,471 30,364
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 19,618 44,012
Available-for-sale securities, Less Than Twelve Months, Fair Value 1,662,248 1,789,692
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 15,817 6,261
Available-for-sale securities, Twelve Months or Longer, Fair Value 507,083 50,298
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 35,435 50,273
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 2,169,331 1,839,990
US Government-sponsored Enterprises Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 1,624 2,978
Available-for-sale securities, Less Than Twelve Months, Fair Value 42,376 56,022
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 740 0
Available-for-sale securities, Twelve Months or Longer, Fair Value 14,260 0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 2,364 2,978
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 56,636 56,022
Corporate debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 1,437 1,285
Available-for-sale securities, Less Than Twelve Months, Fair Value 78,563 38,716
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 0 0
Available-for-sale securities, Twelve Months or Longer, Fair Value 0 0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 1,437 1,285
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 78,563 38,716
Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses   2,188
Available-for-sale securities, Less Than Twelve Months, Fair Value   63,151
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses   54
Available-for-sale securities, Twelve Months or Longer, Fair Value   1,471
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total   2,242
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total   64,622
Residential mortgage-backed securities issued by GSEs    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 11,994 16,990
Available-for-sale securities, Less Than Twelve Months, Fair Value 1,005,130 950,480
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 3,895 140
Available-for-sale securities, Twelve Months or Longer, Fair Value 184,589 5,326
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 15,889 17,130
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 1,189,719 955,806
Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 1,121 9,937
Available-for-sale securities, Less Than Twelve Months, Fair Value 120,904 148,780
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 3,664 0
Available-for-sale securities, Twelve Months or Longer, Fair Value 68,248 0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 4,785 9,937
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 189,152 148,780
Private label residential mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 2,295 6,170
Available-for-sale securities, Less Than Twelve Months, Fair Value 327,580 377,638
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 2,351 599
Available-for-sale securities, Twelve Months or Longer, Fair Value 134,429 16,969
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 4,646 6,769
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 462,009 394,607
Trust preferred securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 0 0
Available-for-sale securities, Less Than Twelve Months, Fair Value 0 0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 2,792 5,468
Available-for-sale securities, Twelve Months or Longer, Fair Value 29,208 26,532
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 2,792 5,468
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 29,208 26,532
CRA investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 349 514
Available-for-sale securities, Less Than Twelve Months, Fair Value 50,648 37,113
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 0 0
Available-for-sale securities, Twelve Months or Longer, Fair Value 0 0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 349 514
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 50,648 37,113
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 796 3,950
Available-for-sale securities, Less Than Twelve Months, Fair Value 35,545 117,792
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 2,375 0
Available-for-sale securities, Twelve Months or Longer, Fair Value 76,349 0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 3,171 3,950
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 111,894 $ 117,792
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 2  
Available-for-sale securities, Less Than Twelve Months, Fair Value 1,502  
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 0  
Available-for-sale securities, Twelve Months or Longer, Fair Value 0  
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 2  
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total $ 1,502