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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Fixed rate loans held | $ 1,640,000,000 |  |
Secure borrowings from FHLB and Federal Reserve Bank | 2,310,000,000 | 2,320,000,000 |
Impaired, at carrying value | 106,909,000 | 108,390,000 | 101,226,000
Impaired, at carrying value | 92,100,000 |  |
Impaired construction speculative loans | 10,000,000 |  |
Reserve for unfunded commitments | 500,000 | (1,000,000) | (918,000)
Reserve for credit risk for undisbursed commitments | 9,100,000 | 8,600,000 |
Allocation of allowance to troubled debt restructuring | 2,700,000 | 1,700,000 |
Troubled debt restructurings, pre-modification outstanding recorded investment | 0 |  | 56,592,000
Nonaccrual Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 12,400,000 |  |
Nonaccrual Consumer Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 401,000 |  |
Non-covered Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value |  | 108,400,000 |
Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 106,900,000 |  |
Impaired, at carrying value | 67,000,000 |  |
Number of performing loans | 46 |  |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 7,600,000 |  |
Nonperforming Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 25,100,000 |  |
Impaired, at carrying value | 25,100,000 |  |
Allowance Impaired loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 3,200,000 |  |
Allowance Impaired Non-covered Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value |  | 2,300,000 |
Nonaccrual Residential Construction and Land Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 10,000,000 |  |
Nonaccrual Commercial and Industrial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 3,900,000 |  |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total loan portfolio | 65.02% |  |
Number of loans |  | 1 | 2
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 2,400,000 | 3,400,000
Commercial Real Estate Loans [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 21,000,000 |  |
Number of loans | 15 |  |
Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total loan portfolio | 1.39% |  |
Number of loans |  | 1 |
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 10,700,000 |
Construction [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 16,900,000 |  |
Number of loans | 2 |  |
Nonaccrual Dairy and Livestock Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 5,700,000 |  |
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 92,100,000 |  |
Dairy & Livestock and Agribusiness [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans |  |  | 2
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  | 886,000
Dairy & Livestock and Agribusiness [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 24,100,000 |  |
Number of loans | 11 |  |
Single-family Residential Loans [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 3,800,000 |  |
Number of loans | 11 |  |
Commercial and Industrial [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | $ 1,200,000 |  |
Number of loans | 7 |  |

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- Definition Amount of impaired loan transferred to nonaccrual status. + References No definition available. + 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=28368275&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 + Details
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