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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 197,806 $ 738,461
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (711) (5,417)
Fair Value, 12 Months or Longer, Available-for-sale 133,092 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (937) (20,197)
Fair Value, Available-for-sale 330,898 1,481,071
Gross Unrealized Holding Losses, Available-for-sale (1,648) (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity 70,250 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (442) (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity 215,579 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (3,292) (22,754)
Fair Value, Held-to-maturity 285,829 565,123
Gross Unrealized Holding Losses, Held-to-maturity (3,734) (24,031)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 177,517 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (705) (365)
Fair Value, 12 Months or Longer, Available-for-sale 34,565 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (191) (3,160)
Fair Value, Available-for-sale 212,082 171,644
Gross Unrealized Holding Losses, Available-for-sale (896) (3,525)
Fair Value, Less Than 12 Months, Held-to-maturity 23,897 0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (104) 0
Fair Value, 12 Months or Longer, Held-to-maturity 166,193 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,354) (12,081)
Fair Value, Held-to-maturity 190,090 203,254
Gross Unrealized Holding Losses, Held-to-maturity (2,458) (12,081)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 28,359 7,479
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (252) (15)
Fair Value, 12 Months or Longer, Held-to-maturity 19,405 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (405) (2,607)
Fair Value, Held-to-maturity 47,764 62,423
Gross Unrealized Holding Losses, Held-to-maturity (657) (2,622)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 20,289 692,311
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (6) (4,864)
Fair Value, 12 Months or Longer, Available-for-sale 97,964 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (744) (16,082)
Fair Value, Available-for-sale 118,253 1,285,678
Gross Unrealized Holding Losses, Available-for-sale (750) (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity 10,411 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (54) (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 10,411 150,734
Gross Unrealized Holding Losses, Held-to-maturity (54) (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 563 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2) (955)
Fair Value, Available-for-sale 563 23,749
Gross Unrealized Holding Losses, Available-for-sale (2) (1,143)
Fair Value, Less Than 12 Months, Held-to-maturity 7,583 70,989
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (32) (778)
Fair Value, 12 Months or Longer, Held-to-maturity 29,981 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (533) (5,410)
Fair Value, Held-to-maturity 37,564 148,712
Gross Unrealized Holding Losses, Held-to-maturity $ (565) $ (6,188)