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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, 2017 USD ($) Contract SecurityLoan | Dec. 31, 2016 USD ($) Contract | Dec. 31, 2015 USD ($) Contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total fixed rate loans held | $ 2,170,000,000 |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 3,680,000,000 | $ 3,110,000,000 |
Loans held-for-sale | 0 | 0 |
Impaired, at carrying value | 15,525,000 | 26,385,000 | $ 63,706,000
Loans classified as troubled debt restructured | 9,000,000 |  |
Impaired, at carrying value | 75,000 | 141,000 | 669,000
Provision for unfunded loan commitments | 400,000 | 450,000 | $ 500,000
Reserve for credit risk for undisbursed commitments | 6,300,000 | 6,700,000 |
Allocation of allowance to troubled debt restructuring | 1,000 | $ 141,000 |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  | 0 | 0
Valley Business Bank [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | $ 3,700,000 |  |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 76.77% |  |
Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 70.23% |  |
Nonaccrual Small Business Administration Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | $ 906,000 |  |
Dairy & Livestock and Agribusiness [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 829,000 |  |
Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 9,000,000 |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial real estate loan outstanding balance modified as a TDR within the previous 12 months that subsequently defaulted | $ 3,100,000 |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract | 1 |  |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | $ 1,300,000 |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 6,800,000 |  |
Consumer and Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 552,000 |  |
Performing Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | 15,500,000 |  |
Loans classified as troubled debt restructured | $ 4,800,000 |  |
Number of performing loans | SecurityLoan | 16 |  |
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | $ 1,300,000 |  |
Number of loans | SecurityLoan | 2 |  |
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | $ 2,700,000 |  |
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 | $ 190,000 |  |
Number of loans | SecurityLoan | 3 |  |
Performing Financing Receivable [Member] | Small Business Administration [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | $ 625,000 |  |
Number of loans | SecurityLoan | 1 |  |
Nonperforming Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired, at carrying value | $ 4,200,000 |  |
Loans classified as troubled debt restructured | 4,200,000 |  |
Allowance Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans classified as troubled debt restructured | 75,000 |  |
Loans, Excluding PCI Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial real estate loans | 3,376,713,000 | $ 2,930,141,000 |
Dairy & livestock and agribusiness | 347,289,000 | 338,631,000 |
Impaired, at carrying value |  | 26,400,000 |
Outstanding balance | 10,716,000 | 7,152,000 |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Dairy & livestock and agribusiness | 310,600,000 | 317,900,000 |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Dairy & livestock and agribusiness | 36,700,000 | 20,700,000 |
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 250,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 829,000 | 0 |
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | 250,000 | 156,000 |
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding balance | $ 906,000 | $ 2,737,000 |
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) | 6.10% | 6.16% |
Commercial real estate loans | $ 206,100,000 | $ 180,600,000 |
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 | 118,200,000 | 127,100,000 |
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 | $ 87,900,000 | $ 53,600,000 |

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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 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: 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=84173941&loc=d3e5086-111524 + Details
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