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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2017 USD ($) Contract SecurityLoan | Sep. 30, 2016 USD ($) Contract | Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total fixed rate loans held | $ 2,160,000,000 |  | $ 2,160,000,000 |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 3,610,000,000 |  | 3,610,000,000 |  | $ 3,110,000,000
Loans held-for-sale | 0 |  | 0 |  | 0
Impaired, at carrying value | 17,308,000 | $ 35,684,000 | 17,308,000 | $ 35,684,000 | 26,385,000
Loans classified as troubled debt restructured | 10,000,000 |  | 10,000,000 |  |
Impaired, at carrying value | 88,000 | 548,000 | 88,000 | 548,000 | 141,000
Provision for unfunded loan commitments | 0 | $ 0 | 0 | $ 0 |
Reserve for credit risk for undisbursed commitments | 6,700,000 |  | 6,700,000 |  | 6,700,000
Allocation of allowance to troubled debt restructuring | $ 5,000 |  | $ 5,000 |  | 141,000
Number of loans modified as TDRs | Contract | 0 | 2 | 3 | 5 |
Valley Business Bank [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | $ 4,500,000 |  | $ 4,500,000 |  |
Commercial Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 70.66% |  | 70.66% |  |
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 77.42% |  | 77.42% |  |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | $ 829,000 |  | $ 829,000 |  |
Commercial real estate loan outstanding balance modified as a TDR within the previous 12 months that subsequently defaulted |  |  | $ 78,000 |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  |  | 1 |  |
Nonaccrual Small Business Administration Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 1,600,000 |  | $ 1,600,000 |  |
Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | 10,000,000 |  | 10,000,000 |  |
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 |  | $ 1,300,000 |  |
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 6,700,000 |  | 6,700,000 |  |
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 743,000 |  | 743,000 |  |
Nonperforming Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | 4,300,000 |  | 4,300,000 |  |
Loans classified as troubled debt restructured | 4,300,000 |  | 4,300,000 |  |
Performing Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 5,700,000 |  | $ 5,700,000 |  |
Number of performing loans | SecurityLoan |  |  | 21 |  |
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 1,400,000 |  | $ 1,400,000 |  |
Number of loans | SecurityLoan |  |  | 3 |  |
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 3,200,000 |  | $ 3,200,000 |  |
Number of loans | SecurityLoan |  |  | 11 |  |
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 432,000 |  | $ 432,000 |  |
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 | 662,000 |  | $ 662,000 |  |
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 | 0 |  | $ 0 |  |
Number of loans | SecurityLoan |  |  | 0 |  |
Allowance Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 88,000 |  | $ 88,000 |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial real estate loans | 3,332,517,000 |  | 3,332,517,000 |  | 2,930,141,000
Dairy & livestock and agribusiness | 270,482,000 |  | 270,482,000 |  | 338,631,000
Outstanding balance | 11,573,000 |  | 11,573,000 |  | 7,152,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Dairy & livestock and agribusiness | 235,200,000 |  | 235,200,000 |  | 317,900,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Dairy & livestock and agribusiness | 35,300,000 |  | 35,300,000 |  | 20,700,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 829,000 |  | 829,000 |  | 0
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 313,000 |  | 313,000 |  |
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 313,000 |  | 313,000 |  | 156,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 1,611,000 |  | 1,611,000 |  | 2,737,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | $ 743,000 |  | $ 743,000 |  | $ 369,000
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) | 5.41% |  | 5.41% |  | 6.16%
Commercial real estate loans | $ 180,200,000 |  | $ 180,200,000 |  | $ 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 | 102,000,000 |  | 102,000,000 |  | 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 | $ 78,200,000 |  | $ 78,200,000 |  | $ 53,600,000

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