Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 9,000	$ 43,813
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	1	55
Fair Value, 12 Months or Longer, Available-for-sale	0	509,509
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	12,123
Fair Value, Available-for-sale	9,000	553,322
Gross Unrealized Holding Losses, Available-for-sale	1	12,178
Fair Value, Less Than 12 Months, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	196
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Held-to-maturity	196
CMO's/REMIC's - Residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	0
Fair Value, 12 Months or Longer, Available-for-sale	0	31,143
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	277
Fair Value, Available-for-sale	0	31,143
Gross Unrealized Holding Losses, Available-for-sale	0	277
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Municipal Bonds [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	1,953
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	23
Fair Value, 12 Months or Longer, Available-for-sale	0	24,812
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	622
Fair Value, Available-for-sale	0	26,765
Gross Unrealized Holding Losses, Available-for-sale	0	645
Fair Value, Less Than 12 Months, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	196
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Held-to-maturity	196
Government Agency/GSEs [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	9,000	22,224
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	1	28
Fair Value, 12 Months or Longer, Available-for-sale	0	307,873
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	8,200
Fair Value, Available-for-sale	9,000	330,097
Gross Unrealized Holding Losses, Available-for-sale	1	8,228
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Residential Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	19,636
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	4
Fair Value, 12 Months or Longer, Available-for-sale	0	145,681
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	3,024
Fair Value, Available-for-sale	0	165,317
Gross Unrealized Holding Losses, Available-for-sale	0	3,028
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Other Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	0
Fair Value, 12 Months or Longer, Available-for-sale	0	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	0
Fair Value, Available-for-sale	0	0
Gross Unrealized Holding Losses, Available-for-sale	0	$ 0
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	$ 0

Schedule Of Available For Sale Securities And Held To Maturity [Line Items]

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