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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | $ 93,400 | $ 105,648 | $ 104,453 | $ 110,147
Provision for loan losses | 5,108 | 2,500 | 14,683 | 5,955
Charge-offs | (8,142) | (8,957) | (34,607) | (24,747)
Recoveries | 2,781 | 6,210 | 8,618 | 14,046
Net charge-offs | (5,361) | (2,747) | (25,989) | (10,701)
Ending balance | 93,147 | 105,401 | 93,147 | 105,401
Commercial and Industrial [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 50,814 | 53,475 | 54,164 | 42,774
Provision for loan losses | 8,060 | 2,723 | 24,120 | 18,275
Charge-offs | (4,962) | (5,837) | (25,700) | (13,323)
Recoveries | 666 | 1,181 | 1,994 | 3,816
Net charge-offs | (4,296) | (4,656) | (23,706) | (9,507)
Ending balance | 54,578 | 51,542 | 54,578 | 51,542
Commercial Real Estate [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 23,573 | 27,631 | 29,346 | 20,912
Provision for loan losses | (1,983) | (2,682) | (7,957) | 5,882
Charge-offs | (56) | (520) | (737) | (3,715)
Recoveries | 182 | 3,212 | 1,064 | 4,562
Net charge-offs | 126 | 2,692 | 327 | 847
Ending balance | 21,716 | 27,641 | 21,716 | 27,641
Consumer Real Estate [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 4,917 | 5,235 | 5,252 | 3,540
Provision for loan losses | 638 | 315 | 564 | 2,295
Charge-offs | (514) | (209) | (1,009) | (1,104)
Recoveries | 57 | 53 | 291 | 663
Net charge-offs | (457) | (156) | (718) | (441)
Ending balance | 5,098 | 5,394 | 5,098 | 5,394
Consumer and Other [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 4,130 | 3,649 | 3,507 | 12,635
Provision for loan losses | 1,286 | 880 | 3,067 | (7,133)
Charge-offs | (2,610) | (2,391) | (7,161) | (6,605)
Recoveries | 1,876 | 1,764 | 5,269 | 5,005
Net charge-offs | (734) | (627) | (1,892) | (1,600)
Ending balance | 4,682 | 3,902 | 4,682 | 3,902
Unallocated [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 9,966 | 15,658 | 12,184 | 30,286
Provision for loan losses | (2,893) | 1,264 | (5,111) | (13,364)
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0 | 0
Ending balance | $ 7,073 | $ 16,922 | $ 7,073 | $ 16,922

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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