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Loan and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Debt And Capital Lease Obligations [Line Items] |  |  |
Fixed rate loans held |  | $ 1,530,000,000 |
Secure borrowings from FHLB and Federal Reserve Bank |  | 2,320,000,000 | 2,310,000,000
Transfers of loans to held-for-sale | 6,000,000 |  |
Charge-off against allowance for credit losses | 619,000 |  |
Write-down of loans held-for-sale |  |  | 1,700,000
Impaired, at carrying value |  | 108,390,000 | 101,226,000
Impaired, at carrying value |  | 81,700,000 |
Amount of impaired loan transferred to non accrual status |  | 10,600,000 |
Reserve for unfunded commitments |  | 1,000,000 | 918,000
Risk for credit risk for undisbursed commitments |  | 8,600,000 | 9,600,000
Allocation of allowance to troubled debt restructuring |  | 1,400,000 | 27,000.0
Covered Loans Held-for-Sale Activity [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Write-down of loans held-for-sale |  | 1,219,000 | 0
Loans held-for-sale |  |  | 5,664,000
Nonaccrual Commercial Real Estate Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | 21,000,000 |
Nonaccrual Consumer Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | 215,000 |
Non-Covered Impaired Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  |  | 101,200,000
Performing Financing Receivable [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  | 108,400,000 |
Impaired, at carrying value |  | 50,400,000 |
Number of performing loans |  | 34 |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | 13,100,000 |
Non-Performing Financing Receivable [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  | 31,300,000 |
Impaired, at carrying value |  | 31,300,000 |
Allowance Impaired Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  | 2,300,000 |
Allowance Impaired Non-Covered Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  |  | 3,000,000
Commercial Real Estate Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Percentage of loan portfolio |  | 62.35% |
Outstanding balance |  | 2,400,000 |
Number of contracts |  | 1 |
Nonaccrual Dairy and Livestock Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | 9,800,000 |
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Impaired, at carrying value |  | 81,700,000 |
Construction [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Percentage of loan portfolio |  | 1.76% |
Outstanding balance |  | 10,700,000 |
Number of contracts |  | 1 |
Nonaccrual Residential Construction and Land Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | 10,700,000 |
Nonaccrual Commercial and Industrial Loans [Member] |  |  |
Debt And Capital Lease Obligations [Line Items] |  |  |
Outstanding balance |  | $ 3,100,000 |

X
- Definition Allocation of reserves to troubled debt restructuring. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of impaired loan transferred to nonaccrual status. + References No definition available. + Details
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- Definition Charge-off against allowance for loan losses. + References No definition available. + Details
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- Details
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- Definition Loans classified as a troubled debt restructured. + References No definition available. + Details
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- Definition Loans receivable percentage of portfolio. + References No definition available. + Details
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- Definition Number of performing loans. + References No definition available. + Details
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- Definition Provision for unfunded commitments. + References No definition available. + Details
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- Definition Reserve for credit risk for undisbursed commitments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Write down of loans held for sale. + References No definition available. + Details
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Balance Type: | credit
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition Reflects the carrying amount of loans held for sale not otherwise specified in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 65 -Paragraph 4, 5, 6, 7, 8, 9, 12, 17, 28, 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 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(a)(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph h(i) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 15 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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