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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 1,249 $ 190,857
Less than 12 Months, Unrealized Losses (10) (9,356)
12 Months or Longer, Fair Value 195,355 114,798
12 Months or Longer, Unrealized Losses (14,639) (16,933)
Fair Value 196,604 305,655
Unrealized Losses (14,649) (26,289)
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 915 57,950
Less than 12 Months, Unrealized Losses (3) (4,147)
12 Months or Longer, Fair Value 29,615 3,049
12 Months or Longer, Unrealized Losses (1,741) (490)
Fair Value 30,530 60,999
Unrealized Losses (1,744) (4,637)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 48,310 46,234
12 Months or Longer, Unrealized Losses (7,482) (9,530)
Fair Value 48,310 46,234
Unrealized Losses (7,482) (9,530)
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 180 114,047
Less than 12 Months, Unrealized Losses (5) (4,361)
12 Months or Longer, Fair Value 97,950 55,706
12 Months or Longer, Unrealized Losses (3,433) (4,147)
Fair Value 98,130 169,753
Unrealized Losses (3,438) (8,508)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 10,008 9,789
12 Months or Longer, Unrealized Losses (1,733) (2,754)
Fair Value 10,008 9,789
Unrealized Losses (1,733) (2,754)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 180 114,047
Less than 12 Months, Unrealized Losses (5) (4,361)
12 Months or Longer, Fair Value 107,958 65,495
12 Months or Longer, Unrealized Losses (5,166) (6,901)
Fair Value 108,138 179,542
Unrealized Losses (5,171) (11,262)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 154 4,976
Less than 12 Months, Unrealized Losses (2) (24)
12 Months or Longer, Fair Value   20
12 Months or Longer, Unrealized Losses   (12)
Fair Value 154 4,996
Unrealized Losses (2) (36)
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value   9,013
Less than 12 Months, Unrealized Losses   (695)
12 Months or Longer, Fair Value 9,472  
12 Months or Longer, Unrealized Losses (250)  
Fair Value 9,472 9,013
Unrealized Losses (250) (695)
Corporate securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value   4,871
Less than 12 Months, Unrealized Losses   (129)
Fair Value   4,871
Unrealized Losses   $ (129)