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Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Nonaccrual commercial real estate loans [Member] | Jun. 30, 2013 Nonaccrual Consumer Loans [Member] | Dec. 31, 2012 Non-covered impaired loans [Member] | Jun. 30, 2013 Construction [Member] SecurityLoan | Jun. 30, 2013 Nonaccrual Residential Construction and Land Loans [Member] | Jun. 30, 2013 Nonaccrual commercial and industrial loans [Member] | Jun. 30, 2013 Commercial real estate loans [Member] | Jun. 30, 2013 Commercial real estate loans [Member] SecurityLoan | Jun. 30, 2013 Nonaccrual dairy and livestock loans [Member] | Jun. 30, 2013 Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member] | Jun. 30, 2013 Dairy & livestock and agribusiness [Member] SecurityLoan | Jun. 30, 2013 Single-family residential loans [Member] SecurityLoan | Jun. 30, 2013 Commercial and Industrial [Member] | Jun. 30, 2013 Commercial and Industrial [Member] SecurityLoan | Jun. 30, 2013 Performing financing receivable [Member] SecurityLoan | Jun. 30, 2013 Nonperforming financing receivable [Member] | Jun. 30, 2013 Nonaccrual single family mortgage loans [Member] | Jun. 30, 2013 Allowance Impaired loans [Member] | Dec. 31, 2012 Allowance impaired non-covered loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross loan portfolio |  |  |  |  |  |  |  |  | 1.41% |  |  | 64.20% | 64.20% |  |  |  |  |  |  |  |  |  |  |
Fixed rate loans held | $ 1,600,000,000 |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secure borrowings from FHLB and Federal Reserve Bank | 1,980,000,000 |  | 1,980,000,000 |  | 2,320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired, at carrying value | 114,917,000 |  | 114,917,000 |  | 108,390,000 |  |  | 108,400,000 |  |  |  |  |  |  | 88,100,000 |  |  |  |  | 114,900,000 | 26,500,000 |  |  | 2,300,000
Outstanding balance |  |  |  |  |  | 18,600,000 | 157,000 |  |  | 10,500,000 | 5,000,000 |  |  | 7,700,000 |  |  |  |  |  |  |  | 11,400,000 |  |
Impaired, at carrying value | 88,100,000 |  | 88,100,000 |  |  |  |  |  | 16,900,000 |  |  | 21,000,000 | 21,000,000 |  |  | 20,500,000 | 2,000,000 | 1,200,000 | 1,200,000 | 61,600,000 | 26,500,000 |  | 4,900,000 |
Number of performing loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |
Amount of impaired loan transferred to nonaccrual status |  |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for unfunded commitments | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for credit risk for undisbursed commitments | 8,600,000 |  | 8,600,000 |  | 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans |  |  |  |  |  |  |  |  | 2 |  |  |  | 14 |  |  | 10 | 7 |  | 7 |  |  |  |  |
Allocation of allowance to troubled debt restructuring | 1,900,000 |  | 1,900,000 |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment | $ 11,147,000 | $ 20,197,000 | $ 15,606,000 | $ 23,551,000 |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  | $ 89,000 |  |  |  |  |  |

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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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