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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | $ 25,770 | $ 26,205 | $ 26,482
Purchased impaired provision | 8,659 |  |
Benefit attributable to FDIC indemnification asset | (451) |  |
Provision for loan losses charged to operations | 8,208 | 5,678 | 9,047
Provision for loan losses recorded through the FDIC indemnification asset | 8,208 | 5,678 | 9,047
Ending balance | 24,077 | 25,770 | 26,205
Purchased Credit Impaired |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 8 | 201 |
Purchased impaired provision | 747 |  |
Benefit attributable to FDIC indemnification asset | (451) |  |
Provision for loan losses charged to operations | 296 | (193) | 201
Provision for loan losses recorded through the FDIC indemnification asset | 451 |  |
Ending balance | 755 | 8 | 201
Commercial Loans | Purchased Credit Impaired |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 8 | 201 |
Purchased impaired provision | 69 |  |
Benefit attributable to FDIC indemnification asset | (55) |  |
Provision for loan losses charged to operations | 14 | (193) | 201
Provision for loan losses recorded through the FDIC indemnification asset | 55 |  |
Ending balance | 77 | 8 | 201
Consumer Real Estate | Purchased Credit Impaired |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Purchased impaired provision | 678 |  |
Benefit attributable to FDIC indemnification asset | (396) |  |
Provision for loan losses charged to operations | 282 |  |
Provision for loan losses recorded through the FDIC indemnification asset | 396 |  |
Ending balance | $ 678 |  |

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- Definition (Provision) Benefit for Loan Losses + References No definition available. + Details
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- Definition Provision for (Recovery of) Loan and Lease Losses + References No definition available. + Details
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- Definition Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios. + 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 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 loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 Reference 4: 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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