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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 0 $ 738,461
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (5,417)
Fair Value, 12 Months or Longer, Available-for-sale 303,729 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,792) (20,197)
Fair Value, Available-for-sale 303,729 1,481,071
Gross Unrealized Holding Losses, Available-for-sale (2,792) (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity 10,722 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (45) (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity 365,628 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (6,393) (22,754)
Fair Value, Held-to-maturity 376,350 565,123
Gross Unrealized Holding Losses, Held-to-maturity (6,438) (24,031)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (365)
Fair Value, 12 Months or Longer, Available-for-sale 71,924 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (334) (3,160)
Fair Value, Available-for-sale 71,924 171,644
Gross Unrealized Holding Losses, Available-for-sale (334) (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 201,974 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (4,358) (12,081)
Fair Value, Held-to-maturity 201,974 203,254
Gross Unrealized Holding Losses, Held-to-maturity (4,358) (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 39,016 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (414) (2,607)
Fair Value, Held-to-maturity   62,423
Gross Unrealized Holding Losses, Held-to-maturity (414) (2,622)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 692,311
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (4,864)
Fair Value, 12 Months or Longer, Available-for-sale 228,518 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,417) (16,082)
Fair Value, Available-for-sale 228,518 1,285,678
Gross Unrealized Holding Losses, Available-for-sale (2,417) (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity 10,722 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (45) (484)
Fair Value, 12 Months or Longer, Held-to-maturity 75,536 90,863
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (370) (2,656)
Fair Value, Held-to-maturity 86,258 150,734
Gross Unrealized Holding Losses, Held-to-maturity (415) (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 3,287 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (41) (955)
Fair Value, Available-for-sale 3,287 23,749
Gross Unrealized Holding Losses, Available-for-sale (41) (1,143)
Fair Value, Less Than 12 Months, Held-to-maturity 0 70,989
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 (778)
Fair Value, 12 Months or Longer, Held-to-maturity 49,102 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,251) (5,410)
Fair Value, Held-to-maturity 49,102 148,712
Gross Unrealized Holding Losses, Held-to-maturity $ (1,251) $ (6,188)