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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 738,461 $ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (5,417) (2,319)
Fair Value, 12 Months or Longer, Available-for-sale 742,610 388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (20,197) (8,109)
Fair Value, Available-for-sale 1,481,071 899,099
Gross Unrealized Holding Losses, Available-for-sale (25,614) (10,428)
Fair Value, Less Than 12 Months, Held-to-maturity 138,339 102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,277) (707)
Fair Value, 12 Months or Longer, Held-to-maturity 426,784 381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (22,754) (14,240)
Fair Value, Held-to-maturity 565,123 483,765
Gross Unrealized Holding Losses, Held-to-maturity (24,031) (14,947)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 36,582 95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (365) (487)
Fair Value, 12 Months or Longer, Available-for-sale 135,062 71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (3,160) (1,595)
Fair Value, Available-for-sale 171,644 166,360
Gross Unrealized Holding Losses, Available-for-sale (3,525) (2,082)
Fair Value, Less Than 12 Months, Held-to-maturity 0 0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 0
Fair Value, 12 Months or Longer, Held-to-maturity 203,254 216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (12,081) (8,641)
Fair Value, Held-to-maturity 203,254 216,431
Gross Unrealized Holding Losses, Held-to-maturity (12,081) (8,641)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 7,479 18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (15) (27)
Fair Value, 12 Months or Longer, Held-to-maturity 54,944 43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,607) (2,107)
Fair Value, Held-to-maturity 62,423 62,445
Gross Unrealized Holding Losses, Held-to-maturity (2,622) (2,134)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 692,311 414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (4,864) (1,828)
Fair Value, 12 Months or Longer, Available-for-sale 593,367 303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (16,082) (6,274)
Fair Value, Available-for-sale 1,285,678 717,837
Gross Unrealized Holding Losses, Available-for-sale (20,946) (8,102)
Fair Value, Less Than 12 Months, Held-to-maturity 59,871 51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (484) (188)
Fair Value, 12 Months or Longer, Held-to-maturity 90,863 55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,656) (194)
Fair Value, Held-to-maturity 150,734 106,603
Gross Unrealized Holding Losses, Held-to-maturity (3,140) (382)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 9,568 946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (188) (4)
Fair Value, 12 Months or Longer, Available-for-sale 14,181 13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (955) (240)
Fair Value, Available-for-sale 23,749 14,902
Gross Unrealized Holding Losses, Available-for-sale (1,143) (244)
Fair Value, Less Than 12 Months, Held-to-maturity 70,989 32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (778) (492)
Fair Value, 12 Months or Longer, Held-to-maturity 77,723 66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (5,410) (3,298)
Fair Value, Held-to-maturity 148,712 98,286
Gross Unrealized Holding Losses, Held-to-maturity $ (6,188) $ (3,790)