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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 238,354 $ 83,739
Less than 12 Months, Unrealized Losses (10,545) (571)
12 Months or Longer, Fair Value 58,894 55,835
12 Months or Longer, Unrealized Losses (12,491) (14,289)
Fair Value 297,248 139,574
Unrealized Losses (23,036) (14,860)
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 9,414  
Less than 12 Months, Unrealized Losses (280)  
Fair Value 9,414  
Unrealized Losses (280)  
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 44,274 6,436
Less than 12 Months, Unrealized Losses (3,951) (97)
Fair Value 44,274 6,436
Unrealized Losses (3,951) (97)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 46,182 44,646
12 Months or Longer, Unrealized Losses (9,553) (11,061)
Fair Value 46,182 44,646
Unrealized Losses (9,553) (11,061)
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 179,683 74,197
Less than 12 Months, Unrealized Losses (6,297) (449)
12 Months or Longer, Fair Value 1,695 15
12 Months or Longer, Unrealized Losses (77)  
Fair Value 181,378 74,212
Unrealized Losses (6,374) (449)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 10,884 11,066
12 Months or Longer, Unrealized Losses (2,805) (3,148)
Fair Value 10,884 11,066
Unrealized Losses (2,805) (3,148)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 179,683 74,197
Less than 12 Months, Unrealized Losses (6,297) (449)
12 Months or Longer, Fair Value 12,579 11,081
12 Months or Longer, Unrealized Losses (2,882) (3,148)
Fair Value 192,262 85,278
Unrealized Losses (9,179) (3,597)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,983 3,106
Less than 12 Months, Unrealized Losses (17) (25)
12 Months or Longer, Fair Value 133 108
12 Months or Longer, Unrealized Losses (56) (80)
Fair Value 5,116 3,214
Unrealized Losses $ (73) $ (105)