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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 210,852 $ 83,739
Less than 12 Months, Unrealized Losses (10,313) (571)
12 Months or Longer, Fair Value 72,121 55,835
12 Months or Longer, Unrealized Losses (13,833) (14,289)
Fair Value 282,973 139,574
Unrealized Losses (24,146) (14,860)
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 9,266  
Less than 12 Months, Unrealized Losses (435)  
Fair Value 9,266  
Unrealized Losses (435)  
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 43,722 6,436
Less than 12 Months, Unrealized Losses (3,923) (97)
Fair Value 43,722 6,436
Unrealized Losses (3,923) (97)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 45,939 44,646
12 Months or Longer, Unrealized Losses (9,811) (11,061)
Fair Value 45,939 44,646
Unrealized Losses (9,811) (11,061)
Corporate securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,933  
Less than 12 Months, Unrealized Losses (67)  
Fair Value 4,933  
Unrealized Losses (67)  
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 147,950 74,197
Less than 12 Months, Unrealized Losses (5,869) (449)
12 Months or Longer, Fair Value 16,006 15
12 Months or Longer, Unrealized Losses (768)  
Fair Value 163,956 74,212
Unrealized Losses (6,637) (449)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 10,023 11,066
12 Months or Longer, Unrealized Losses (3,219) (3,148)
Fair Value 10,023 11,066
Unrealized Losses (3,219) (3,148)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 147,950 74,197
Less than 12 Months, Unrealized Losses (5,869) (449)
12 Months or Longer, Fair Value 26,029 11,081
12 Months or Longer, Unrealized Losses (3,987) (3,148)
Fair Value 173,979 85,278
Unrealized Losses (9,856) (3,597)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,981 3,106
Less than 12 Months, Unrealized Losses (19) (25)
12 Months or Longer, Fair Value 153 108
12 Months or Longer, Unrealized Losses (35) (80)
Fair Value 5,134 3,214
Unrealized Losses $ (54) $ (105)