XML 80 R63.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 510,174 $ 734,993
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (2,319) (8,671)
Fair Value, 12 Months or Longer, Available-for-sale 388,925 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (8,109) (1)
Fair Value, Available-for-sale 899,099 740,974
Gross Unrealized Holding Losses, Available-for-sale (10,428) (8,672)
Fair Value, Less Than 12 Months, Held-to-maturity 102,316 652,076
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (707) (14,383)
Fair Value, 12 Months or Longer, Held-to-maturity 381,449 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (14,240) (1,057)
Fair Value, Held-to-maturity 483,765 689,047
Gross Unrealized Holding Losses, Held-to-maturity (14,947) (15,440)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 95,137 128,595
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (487) (1,485)
Fair Value, 12 Months or Longer, Available-for-sale 71,223 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,595) 0
Fair Value, Available-for-sale 166,360 128,595
Gross Unrealized Holding Losses, Available-for-sale (2,082) (1,485)
Fair Value, Less Than 12 Months, Held-to-maturity 0 237,611
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 (6,808)
Fair Value, 12 Months or Longer, Held-to-maturity 216,431 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (8,641) 0
Fair Value, Held-to-maturity 216,431 237,611
Gross Unrealized Holding Losses, Held-to-maturity (8,641) (6,808)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 18,950 76,854
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (27) (1,972)
Fair Value, 12 Months or Longer, Held-to-maturity 43,495 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,107) 0
Fair Value, Held-to-maturity 62,445 76,854
Gross Unrealized Holding Losses, Held-to-maturity (2,134) (1,972)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 414,091 583,143
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (1,828) (6,232)
Fair Value, 12 Months or Longer, Available-for-sale 303,746 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (6,274) 0
Fair Value, Available-for-sale 717,837 583,143
Gross Unrealized Holding Losses, Available-for-sale (8,102) (6,232)
Fair Value, Less Than 12 Months, Held-to-maturity 51,297 191,807
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (188) (1,892)
Fair Value, 12 Months or Longer, Held-to-maturity 55,306 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (194) 0
Fair Value, Held-to-maturity 106,603 191,807
Gross Unrealized Holding Losses, Held-to-maturity (382) (1,892)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 946 23,255
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (4) (954)
Fair Value, 12 Months or Longer, Available-for-sale 13,956 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (240) (1)
Fair Value, Available-for-sale 14,902 29,236
Gross Unrealized Holding Losses, Available-for-sale (244) (955)
Fair Value, Less Than 12 Months, Held-to-maturity 32,069 145,804
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (492) (3,711)
Fair Value, 12 Months or Longer, Held-to-maturity 66,217 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (3,298) (1,057)
Fair Value, Held-to-maturity 98,286 182,775
Gross Unrealized Holding Losses, Held-to-maturity $ (3,790) $ (4,768)