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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 20,829 $ 190,857
Less than 12 Months, Unrealized Losses (87) (9,356)
12 Months or Longer, Fair Value 191,309 114,798
12 Months or Longer, Unrealized Losses (13,464) (16,933)
Fair Value 212,138 305,655
Unrealized Losses (13,551) (26,289)
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,023 57,950
Less than 12 Months, Unrealized Losses (7) (4,147)
12 Months or Longer, Fair Value 27,964 3,049
12 Months or Longer, Unrealized Losses (1,241) (490)
Fair Value 28,987 60,999
Unrealized Losses (1,248) (4,637)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 48,682 46,234
12 Months or Longer, Unrealized Losses (7,125) (9,530)
Fair Value 48,682 46,234
Unrealized Losses (7,125) (9,530)
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 19,654 114,047
Less than 12 Months, Unrealized Losses (76) (4,361)
12 Months or Longer, Fair Value 95,524 55,706
12 Months or Longer, Unrealized Losses (3,225) (4,147)
Fair Value 115,178 169,753
Unrealized Losses (3,301) (8,508)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 9,661 9,789
12 Months or Longer, Unrealized Losses (1,622) (2,754)
Fair Value 9,661 9,789
Unrealized Losses (1,622) (2,754)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 19,654 114,047
Less than 12 Months, Unrealized Losses (76) (4,361)
12 Months or Longer, Fair Value 105,185 65,495
12 Months or Longer, Unrealized Losses (4,847) (6,901)
Fair Value 124,839 179,542
Unrealized Losses (4,923) (11,262)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 152 4,976
Less than 12 Months, Unrealized Losses (4) (24)
12 Months or Longer, Fair Value   20
12 Months or Longer, Unrealized Losses   (12)
Fair Value 152 4,996
Unrealized Losses (4) (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 9,478  
12 Months or Longer, Unrealized Losses (251)  
Fair Value 9,478 9,013
Unrealized Losses (251) (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)