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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 66 $ 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 880,749 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (11,229) (20,197)
Fair Value, Available-for-sale 880,815 1,481,071
Gross Unrealized Holding Losses, Available-for-sale (11,229) (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity 26,291 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (122) (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity 414,659 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (15,811) (22,754)
Fair Value, Held-to-maturity 440,950 565,123
Gross Unrealized Holding Losses, Held-to-maturity (15,933) (24,031)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 66 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (365)
Fair Value, 12 Months or Longer, Available-for-sale 160,926 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,301) (3,160)
Fair Value, Available-for-sale 160,992 171,644
Gross Unrealized Holding Losses, Available-for-sale (2,301) (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 203,148 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (9,998) (12,081)
Fair Value, Held-to-maturity 203,148 203,254
Gross Unrealized Holding Losses, Held-to-maturity (9,998) (12,081)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 26,291 7,479
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (122) (15)
Fair Value, 12 Months or Longer, Held-to-maturity 60,153 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,955) (2,607)
Fair Value, Held-to-maturity 86,444 62,423
Gross Unrealized Holding Losses, Held-to-maturity (2,077) (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 703,134 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (8,540) (16,082)
Fair Value, Available-for-sale 703,134 1,285,678
Gross Unrealized Holding Losses, Available-for-sale (8,540) (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity 0 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 (484)
Fair Value, 12 Months or Longer, Held-to-maturity 86,568 90,863
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (999) (2,656)
Fair Value, Held-to-maturity 86,568 150,734
Gross Unrealized Holding Losses, Held-to-maturity (999) (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 16,689 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (388) (955)
Fair Value, Available-for-sale 16,689 23,749
Gross Unrealized Holding Losses, Available-for-sale (388) (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 64,790 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,859) (5,410)
Fair Value, Held-to-maturity 64,790 148,712
Gross Unrealized Holding Losses, Held-to-maturity $ (2,859) $ (6,188)