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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 190,857 $ 83,739
Less than 12 Months, Unrealized Losses (9,356) (571)
12 Months or Longer, Fair Value 114,798 55,835
12 Months or Longer, Unrealized Losses (16,933) (14,289)
Fair Value 305,655 139,574
Unrealized Losses (26,289) (14,860)
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 57,950 6,436
Less than 12 Months, Unrealized Losses (4,147) (97)
12 Months or Longer, Fair Value 3,049  
12 Months or Longer, Unrealized Losses (490)  
Fair Value 60,999 6,436
Unrealized Losses (4,637) (97)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 46,234 44,646
12 Months or Longer, Unrealized Losses (9,530) (11,061)
Fair Value 46,234 44,646
Unrealized Losses (9,530) (11,061)
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 114,047 74,197
Less than 12 Months, Unrealized Losses (4,361) (449)
12 Months or Longer, Fair Value 55,706 15
12 Months or Longer, Unrealized Losses (4,147)  
Fair Value 169,753 74,212
Unrealized Losses (8,508) (449)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 9,789 11,066
12 Months or Longer, Unrealized Losses (2,754) (3,148)
Fair Value 9,789 11,066
Unrealized Losses (2,754) (3,148)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 114,047 74,197
Less than 12 Months, Unrealized Losses (4,361) (449)
12 Months or Longer, Fair Value 65,495 11,081
12 Months or Longer, Unrealized Losses (6,901) (3,148)
Fair Value 179,542 85,278
Unrealized Losses (11,262) (3,597)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,976 3,106
Less than 12 Months, Unrealized Losses (24) (25)
12 Months or Longer, Fair Value 20 108
12 Months or Longer, Unrealized Losses (12) (80)
Fair Value 4,996 3,214
Unrealized Losses (36) (105)
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 9,012  
Less than 12 Months, Unrealized Losses (695)  
Fair Value 9,012  
Unrealized Losses (695)  
Corporate securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,872  
Less than 12 Months, Unrealized Losses (129)  
Fair Value 4,872  
Unrealized Losses $ (129)