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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 130,978 $ 83,739
Less than 12 Months, Unrealized Losses (1,500) (571)
12 Months or Longer, Fair Value 56,762 55,835
12 Months or Longer, Unrealized Losses (13,172) (14,289)
Fair Value 187,740 139,574
Unrealized Losses (14,672) (14,860)
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 17,126 6,436
Less than 12 Months, Unrealized Losses (411) (97)
Fair Value 17,126 6,436
Unrealized Losses (411) (97)
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 45,751 44,646
12 Months or Longer, Unrealized Losses (9,970) (11,061)
Fair Value 45,751 44,646
Unrealized Losses (9,970) (11,061)
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 112,922 74,197
Less than 12 Months, Unrealized Losses (1,084) (449)
12 Months or Longer, Fair Value 15 15
Fair Value 112,937 74,212
Unrealized Losses (1,084) (449)
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or Longer, Fair Value 10,870 11,066
12 Months or Longer, Unrealized Losses (3,140) (3,148)
Fair Value 10,870 11,066
Unrealized Losses (3,140) (3,148)
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 112,922 74,197
Less than 12 Months, Unrealized Losses (1,084) (449)
12 Months or Longer, Fair Value 10,885 11,081
12 Months or Longer, Unrealized Losses (3,140) (3,148)
Fair Value 123,807 85,278
Unrealized Losses (4,224) (3,597)
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 930 3,106
Less than 12 Months, Unrealized Losses (5) (25)
12 Months or Longer, Fair Value 126 108
12 Months or Longer, Unrealized Losses (62) (80)
Fair Value 1,056 3,214
Unrealized Losses $ (67) $ (105)