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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale   $ 734,993,000
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale   (8,671,000)
Fair Value, 12 Months or Longer, Available-for-sale   5,981,000
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale   (1,000)
Fair Value, Available-for-sale   740,974,000
Gross Unrealized Holding Losses, Available-for-sale   (8,672,000)
Fair Value, Less Than 12 Months, Held-to-maturity $ 572,325,000 652,076
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (14,202,000) (14,383)
Fair Value, 12 Months or Longer, Held-to-maturity 33,200,000 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,061,000) (1,057)
Fair Value, Held-to-maturity 605,525,000 689,047
Gross Unrealized Holding Losses, Held-to-maturity (15,263,000) (15,440)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 97,275,000 128,595,000
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (1,242,000) (1,485,000)
Fair Value, 12 Months or Longer, Available-for-sale 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 0
Fair Value, Available-for-sale 97,275,000 128,595,000
Gross Unrealized Holding Losses, Available-for-sale (1,242,000) (1,485,000)
Fair Value, Less Than 12 Months, Held-to-maturity 230,834,000 237,611
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (7,563,000) (6,808)
Fair Value, 12 Months or Longer, Held-to-maturity 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity 0 0
Fair Value, Held-to-maturity 230,834,000 237,611
Gross Unrealized Holding Losses, Held-to-maturity (7,563,000) (6,808)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 0
Fair Value, Available-for-sale 0 0
Gross Unrealized Holding Losses, Available-for-sale 0 0
Fair Value, Less Than 12 Months, Held-to-maturity 46,205,000 76,854
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,620,000) (1,972)
Fair Value, 12 Months or Longer, Held-to-maturity 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity 0 0
Fair Value, Held-to-maturity 46,205,000 76,854
Gross Unrealized Holding Losses, Held-to-maturity (1,620,000) (1,972)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 498,198,000 583,143,000
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (5,685,000) (6,232,000)
Fair Value, 12 Months or Longer, Available-for-sale 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 0
Fair Value, Available-for-sale 498,198,000 583,143,000
Gross Unrealized Holding Losses, Available-for-sale (5,685,000) (6,232,000)
Fair Value, Less Than 12 Months, Held-to-maturity 184,952,000 191,807
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,528,000) (1,892)
Fair Value, 12 Months or Longer, Held-to-maturity 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity 0 0
Fair Value, Held-to-maturity 184,952,000 191,807
Gross Unrealized Holding Losses, Held-to-maturity (1,528,000) (1,892)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 23,231,000 23,255,000
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (880,000) (954,000)
Fair Value, 12 Months or Longer, Available-for-sale 5,986,000 5,981,000
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,000) (1,000)
Fair Value, Available-for-sale 29,217,000 29,236,000
Gross Unrealized Holding Losses, Available-for-sale (881,000) (955,000)
Fair Value, Less Than 12 Months, Held-to-maturity 110,334,000 145,804
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (3,491,000) (3,711)
Fair Value, 12 Months or Longer, Held-to-maturity 33,200,000 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,061,000) (1,057)
Fair Value, Held-to-maturity 143,534,000 182,775
Gross Unrealized Holding Losses, Held-to-maturity (4,552,000) $ (4,768)
Other Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 618,704,000  
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (7,807,000)  
Fair Value, 12 Months or Longer, Available-for-sale 5,986,000  
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,000)  
Fair Value, Available-for-sale 624,690,000  
Gross Unrealized Holding Losses, Available-for-sale $ (7,808,000)