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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 1,392,935 $ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (21,113) (2,319)
Fair Value, 12 Months or Longer, Available-for-sale 350,287 388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (15,390) (8,109)
Fair Value, Available-for-sale 1,743,222 899,099
Gross Unrealized Holding Losses, Available-for-sale (36,503) (10,428)
Fair Value, Less Than 12 Months, Held-to-maturity 251,263 102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (4,161) (707)
Fair Value, 12 Months or Longer, Held-to-maturity 363,851 381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (21,699) (14,240)
Fair Value, Held-to-maturity 615,114 483,765
Gross Unrealized Holding Losses, Held-to-maturity (25,860) (14,947)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 130,072 95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (2,291) (487)
Fair Value, 12 Months or Longer, Available-for-sale 64,326 71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,782) (1,595)
Fair Value, Available-for-sale 194,398 166,360
Gross Unrealized Holding Losses, Available-for-sale (5,073) (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 206,386 216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (12,773) (8,641)
Fair Value, Held-to-maturity 206,386 216,431
Gross Unrealized Holding Losses, Held-to-maturity (12,773) (8,641)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 53,518 18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (437) (27)
Fair Value, 12 Months or Longer, Held-to-maturity 41,567 43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,511) (2,107)
Fair Value, Held-to-maturity 95,085 62,445
Gross Unrealized Holding Losses, Held-to-maturity (2,948) (2,134)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 1,253,569 414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (18,601) (1,828)
Fair Value, 12 Months or Longer, Available-for-sale 272,657 303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (11,721) (6,274)
Fair Value, Available-for-sale 1,526,226 717,837
Gross Unrealized Holding Losses, Available-for-sale (30,322) (8,102)
Fair Value, Less Than 12 Months, Held-to-maturity 106,204 51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (2,225) (188)
Fair Value, 12 Months or Longer, Held-to-maturity 54,691 55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,795) (194)
Fair Value, Held-to-maturity 160,895 106,603
Gross Unrealized Holding Losses, Held-to-maturity (4,020) (382)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 9,294 946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (221) (4)
Fair Value, 12 Months or Longer, Available-for-sale 13,304 13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (887) (240)
Fair Value, Available-for-sale 22,598 14,902
Gross Unrealized Holding Losses, Available-for-sale (1,108) (244)
Fair Value, Less Than 12 Months, Held-to-maturity 91,541 32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,499) (492)
Fair Value, 12 Months or Longer, Held-to-maturity 61,207 66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (4,620) (3,298)
Fair Value, Held-to-maturity 152,748 98,286
Gross Unrealized Holding Losses, Held-to-maturity $ (6,119) $ (3,790)