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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 SecurityLoan | Mar. 31, 2013 | Dec. 31, 2013 SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-covered fixed rate loans held | $ 1,640,000,000 |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 2,370,000,000 |  | 2,310,000,000
Impaired, at carrying value | 106,596,000 | 112,721,000 | 106,909,000
Loans classified as troubled debt restructured | 90,400,000 |  |
Impaired construction speculative loans | 9,900,000 |  | 10,000,000
Number of nonaccruing loan | 1 |  | 1
Provision for unfunded loan commitments | 0 | 0 |
Reserve for credit risk for undisbursed commitments | 9,100,000 |  | 9,100,000
Number of loans | 0 |  |
Allocation of allowance to troubled debt restructuring | 3,100,000 |  | 2,700,000
Nonaccrual Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 11,800,000 |  |
Nonaccrual Consumer Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 397,000 |  |
Impaired loans-non-covered [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value |  |  | 106,900,000
Nonaccrual Residential Construction and Land Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 9,900,000 |  |
Nonaccrual Commercial and Industrial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 4,800,000 |  |
Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 106,600,000 |  |
Loans classified as troubled debt restructured | 66,400,000 |  |
Number of performing loans | 44 |  |
Number of loans removed from TDR classification | 0 | 0 |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 7,900,000 |  |
Nonperforming Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 24,000,000 |  |
Loans classified as troubled debt restructured | 24,000,000 |  |
Allowance Impaired loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 4,000,000 |  |
Allowance Impaired Non-covered Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value |  |  | 3,200,000
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total non-covered loan portfolio | 67.17% |  |
Commercial Real Estate Loans [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 22,100,000 |  |
Number of loans | 13 |  |
Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total non-covered loan portfolio | 1.31% |  |
Construction [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 16,800,000 |  |
Number of loans | 2 |  |
Dairy & Livestock and Agribusiness [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 22,600,000 |  |
Number of loans | 11 |  |
Single-family residential loans [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 3,800,000 |  |
Number of loans | 11 |  |
Commercial and Industrial [Member] | Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 1,100,000 |  |
Number of loans | 7 |  |
Nonaccrual Dairy and Livestock Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 5,400,000 |  |
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | $ 90,400,000 |  |

X
- Definition Allocation of reserves to troubled debt restructuring. + References No definition available. + 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=28368275&loc=d3e5111-111524 + 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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