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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 137,622 | $ 190,857
Less than 12 Months, Unrealized Losses | (4,800) | (9,356)
12 Months or Longer, Fair Value | 134,304 | 114,798
12 Months or Longer, Unrealized Losses | (16,359) | (16,933)
Fair Value | 271,926 | 305,655
Unrealized Losses | (21,159) | (26,289)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 29,944 | 57,950
Less than 12 Months, Unrealized Losses | (1,629) | (4,147)
12 Months or Longer, Fair Value | 8,840 | 3,049
12 Months or Longer, Unrealized Losses | (1,012) | (490)
Fair Value | 38,784 | 60,999
Unrealized Losses | (2,641) | (4,637)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 46,129 | 46,234
12 Months or Longer, Unrealized Losses | (9,649) | (9,530)
Fair Value | 46,129 | 46,234
Unrealized Losses | (9,649) | (9,530)
Mortgage-backed securities Agency |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 98,271 | 114,047
Less than 12 Months, Unrealized Losses | (2,707) | (4,361)
12 Months or Longer, Fair Value | 69,063 | 55,706
12 Months or Longer, Unrealized Losses | (3,860) | (4,147)
Fair Value | 167,334 | 169,753
Unrealized Losses | (6,567) | (8,508)
Mortgage-backed securities Non-Agency Alt-A residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 10,272 | 9,789
12 Months or Longer, Unrealized Losses | (1,838) | (2,754)
Fair Value | 10,272 | 9,789
Unrealized Losses | (1,838) | (2,754)
Total Mortgage Backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 98,271 | 114,047
Less than 12 Months, Unrealized Losses | (2,707) | (4,361)
12 Months or Longer, Fair Value | 79,335 | 65,495
12 Months or Longer, Unrealized Losses | (5,698) | (6,901)
Fair Value | 177,606 | 179,542
Unrealized Losses | (8,405) | (11,262)
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 143 | 4,976
Less than 12 Months, Unrealized Losses | (13) | (24)
12 Months or Longer, Fair Value |  | 20
12 Months or Longer, Unrealized Losses |  | (12)
Fair Value | 143 | 4,996
Unrealized Losses | (13) | (36)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 9,264 | 9,013
Less than 12 Months, Unrealized Losses | (451) | (695)
Fair Value | 9,264 | 9,013
Unrealized Losses | (451) | (695)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 4,871
Less than 12 Months, Unrealized Losses |  | (129)
Fair Value |  | 4,871
Unrealized Losses |  | $ (129)

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