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Available-For-Sale Securities in Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 20,829 | $ 190,857
Less than 12 Months, Unrealized Losses | (87) | (9,356)
12 Months or Longer, Fair Value | 191,309 | 114,798
12 Months or Longer, Unrealized Losses | (13,464) | (16,933)
Fair Value | 212,138 | 305,655
Unrealized Losses | (13,551) | (26,289)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1,023 | 57,950
Less than 12 Months, Unrealized Losses | (7) | (4,147)
12 Months or Longer, Fair Value | 27,964 | 3,049
12 Months or Longer, Unrealized Losses | (1,241) | (490)
Fair Value | 28,987 | 60,999
Unrealized Losses | (1,248) | (4,637)
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 48,682 | 46,234
12 Months or Longer, Unrealized Losses | (7,125) | (9,530)
Fair Value | 48,682 | 46,234
Unrealized Losses | (7,125) | (9,530)
Mortgage-backed securities Agency |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 19,654 | 114,047
Less than 12 Months, Unrealized Losses | (76) | (4,361)
12 Months or Longer, Fair Value | 95,524 | 55,706
12 Months or Longer, Unrealized Losses | (3,225) | (4,147)
Fair Value | 115,178 | 169,753
Unrealized Losses | (3,301) | (8,508)
Mortgage-backed securities Non-Agency Alt-A residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or Longer, Fair Value | 9,661 | 9,789
12 Months or Longer, Unrealized Losses | (1,622) | (2,754)
Fair Value | 9,661 | 9,789
Unrealized Losses | (1,622) | (2,754)
Total Mortgage Backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 19,654 | 114,047
Less than 12 Months, Unrealized Losses | (76) | (4,361)
12 Months or Longer, Fair Value | 105,185 | 65,495
12 Months or Longer, Unrealized Losses | (4,847) | (6,901)
Fair Value | 124,839 | 179,542
Unrealized Losses | (4,923) | (11,262)
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 152 | 4,976
Less than 12 Months, Unrealized Losses | (4) | (24)
12 Months or Longer, Fair Value |  | 20
12 Months or Longer, Unrealized Losses |  | (12)
Fair Value | 152 | 4,996
Unrealized Losses | (4) | (36)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 9,013
Less than 12 Months, Unrealized Losses |  | (695)
12 Months or Longer, Fair Value | 9,478 |
12 Months or Longer, Unrealized Losses | (251) |
Fair Value | 9,478 | 9,013
Unrealized Losses | (251) | (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 unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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