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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | $ 106,607 | $ 98,286 | $ 99,542 | $ 92,438
Provision for loan losses | 6,810 | 390 | 17,845 | 11,914
Charge-offs | (7,604) | (7,261) | (18,186) | (20,264)
Recoveries | 4,560 | 6,897 | 11,172 | 14,224
Net charge-offs | (3,044) | (364) | (7,014) | (6,040)
Ending balance | 110,373 | 98,312 | 110,373 | 98,312
Commercial and Industrial [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 68,725 | 55,672 | 59,192 | 52,790
Provision for loan losses | 4,193 | 2,224 | 16,258 | 7,936
Charge-offs | (4,074) | (3,631) | (8,580) | (9,026)
Recoveries | 1,959 | 4,371 | 3,933 | 6,936
Net charge-offs | (2,115) | 740 | (4,647) | (2,090)
Ending balance | 70,803 | 58,636 | 70,803 | 58,636
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 24,935 | 22,046 | 27,163 | 22,590
Provision for loan losses | 746 | 4,650 | (1,470) | 5,809
Charge-offs | (107) | (393) | (585) | (3,119)
Recoveries | 309 | 477 | 775 | 1,500
Net charge-offs | 202 | 84 | 190 | (1,619)
Ending balance | 25,883 | 26,780 | 25,883 | 26,780
Consumer Real Estate [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 4,702 | 4,659 | 5,178 | 5,230
Provision for loan losses | 324 | 1,057 | (205) | 490
Charge-offs | (423) | (714) | (524) | (840)
Recoveries | 201 | 105 | 355 | 227
Net charge-offs | (222) | (609) | (169) | (613)
Ending balance | 4,804 | 5,107 | 4,804 | 5,107
Consumer and Other [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 8,245 | 6,427 | 8,009 | 5,010
Provision for loan losses | 1,547 | 1,941 | 3,262 | 4,497
Charge-offs | (3,000) | (2,523) | (8,497) | (7,279)
Recoveries | 2,091 | 1,944 | 6,109 | 5,561
Net charge-offs | (909) | (579) | (2,388) | (1,718)
Ending balance | 8,883 | 7,789 | 8,883 | 7,789
Unallocated [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 0 | 9,482 | 0 | 6,818
Provision for loan losses | 0 | (9,482) | 0 | (6,818)
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0 | 0
Ending balance | $ 0 | $ 0 | $ 0 | $ 0

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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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 -URI http://asc.fasb.org/extlink&oid=49124121&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 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 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 + 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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: 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 4: 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 5: 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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