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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 122,597 $ 738,461
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (156) (5,417)
Fair Value, 12 Months or Longer, Available-for-sale 167,966 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,522) (20,197)
Fair Value, Available-for-sale 290,563 1,481,071
Gross Unrealized Holding Losses, Available-for-sale (1,678) (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity 8,058 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (8) (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity 230,437 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,190) (22,754)
Fair Value, Held-to-maturity 238,495 565,123
Gross Unrealized Holding Losses, Held-to-maturity (2,198) (24,031)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 122,595 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (156) (365)
Fair Value, 12 Months or Longer, Available-for-sale 39,498 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (180) (3,160)
Fair Value, Available-for-sale 162,093 171,644
Gross Unrealized Holding Losses, Available-for-sale (336) (3,525)
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 178,297 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,467) (12,081)
Fair Value, Held-to-maturity 178,297 203,254
Gross Unrealized Holding Losses, Held-to-maturity (1,467) (12,081)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 0 7,479
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 (15)
Fair Value, 12 Months or Longer, Held-to-maturity 19,923 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (170) (2,607)
Fair Value, Held-to-maturity 19,923 62,423
Gross Unrealized Holding Losses, Held-to-maturity (170) (2,622)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 2 692,311
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (4,864)
Fair Value, 12 Months or Longer, Available-for-sale 127,904 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,341) (16,082)
Fair Value, Available-for-sale 127,906 1,285,678
Gross Unrealized Holding Losses, Available-for-sale (1,341) (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity 5,021 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (3) (484)
Fair Value, 12 Months or Longer, Held-to-maturity 0 90,863
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity 0 (2,656)
Fair Value, Held-to-maturity 5,021 150,734
Gross Unrealized Holding Losses, Held-to-maturity (3) (3,140)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 9,568
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (188)
Fair Value, 12 Months or Longer, Available-for-sale 564 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1) (955)
Fair Value, Available-for-sale 564 23,749
Gross Unrealized Holding Losses, Available-for-sale (1) (1,143)
Fair Value, Less Than 12 Months, Held-to-maturity 3,037 70,989
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (5) (778)
Fair Value, 12 Months or Longer, Held-to-maturity 32,217 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (553) (5,410)
Fair Value, Held-to-maturity 35,254 148,712
Gross Unrealized Holding Losses, Held-to-maturity $ (558) $ (6,188)