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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
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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)

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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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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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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 less than twelve months impacting investments. + References No definition available. + Details
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