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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) SecurityLoan | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total fixed rate loans held | $ 2,000,000,000 |  |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 3,110,000,000 | $ 2,910,000,000 |  |
Loans held-for-sale | 0 | 0 |  |
Impaired, at carrying value | 26,385,000 | 63,706,000 | $ 85,792,000 |
Loans classified as troubled debt restructured | 20,900,000 |  |  |
Impaired, at carrying value | 141,000 | 669,000 | 1,549,000 |
Provision for unfunded loan commitments | 450,000 | 500,000 | $ 1,250,000 | $ 1,300,000
Reserve for credit risk for undisbursed commitments | 6,700,000 | 7,200,000 |  |
Allocation of allowance to troubled debt restructuring | $ 141,000 | 607,000 |  |
Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 75.43% |  |  |
Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 67.66% |  |  |
Nonaccrual Small Business Administration Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 2,700,000 |  |  |
Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 20,900,000 |  |  |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 2,200,000 |  |  |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 1,700,000 |  |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 369,000 |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial real estate loans | 2,930,141,000 | 2,643,184,000 |  |
Dairy & livestock and agribusiness | 338,631,000 | 305,509,000 |  |
Impaired, at carrying value |  | 63,700,000 |  |
Outstanding balance | 7,152,000 | 21,019,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Dairy & livestock and agribusiness | 317,900,000 | 287,000,000 |  |
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 156,000 | 704,000 |  |
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 2,737,000 | 2,567,000 |  |
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 369,000 | 519,000 |  |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Dairy & livestock and agribusiness | 20,700,000 | $ 18,500,000 |  |
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 156,000 |  |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 6.16% | 6.54% |  |
Commercial real estate loans | $ 180,600,000 | $ 173,000,000 |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial real estate loans | 127,100,000 | 128,400,000 |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial real estate loans | 53,600,000 | $ 44,600,000 |  |
Nonperforming Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 1,600,000 |  |  |
Loans classified as troubled debt restructured | 1,600,000 |  |  |
Performing Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 26,400,000 |  |  |
Loans classified as troubled debt restructured | $ 19,200,000 |  |  |
Number of performing loans | SecurityLoan | 26 |  |  |
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 13,400,000 |  |  |
Number of loans | SecurityLoan | 6 |  |  |
Performing Financing Receivable [Member] | Dairy & Livestock Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 747,000,000,000 |  |  |
Number of loans | SecurityLoan | 1 |  |  |
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 3,000,000 |  |  |
Number of loans | SecurityLoan | 10 |  |  |
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 745,000 |  |  |
Number of loans | SecurityLoan | 5 |  |  |
Performing Financing Receivable [Member] | Small Business Administration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 845,000 |  |  |
Number of loans | SecurityLoan | 2 |  |  |
Performing Financing Receivable [Member] | Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 484,000 |  |  |
Number of loans | SecurityLoan | 2 |  |  |
Allowance Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | $ 141,000 |  |  |

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