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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
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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)

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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