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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract | Jun. 30, 2018 USD ($) Contract SecurityLoan | Jun. 30, 2017 USD ($) Contract | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total fixed rate loans held | $ 2,200,000,000 |  | $ 2,200,000,000 |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 3,730,000,000 |  | 3,730,000,000 |  | $ 3,680,000,000
Loans held-for-sale | 0 |  | 0 |  | 0
Impaired, at carrying value | 14,712,000 | $ 28,796,000 | 14,712,000 | $ 28,796,000 | 15,525,000
Loans classified as troubled debt restructured | 8,400,000 |  | 8,400,000 |  |
Impaired, at carrying value | 16,000 | 113,000 | 16,000 | 113,000 | 75,000
Provision for unfunded loan commitments | 0 | $ 0 | 0 | $ 0 |
Reserve for credit risk for undisbursed commitments | 6,300,000 |  | 6,300,000 |  | 6,300,000
Allocation of allowance to troubled debt restructuring | $ 0 |  | $ 0 |  | 1,000
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract | 0 |  | 0 |  |
Commercial Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 78.61% |  | 78.61% |  |
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 71.92% |  | 71.92% |  |
Nonaccrual Small Business Administration Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | $ 574,000 |  | $ 574,000 |  |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 800,000 |  | 800,000 |  |
Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | 8,400,000 |  | 8,400,000 |  |
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  | 1 |  | 1 |
Amount of Loan Outstanding |  | $ 3,100,000 |  | $ 3,100,000 |
Nonaccrual Single Family Mortgage Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 1,600,000 |  | 1,600,000 |  |
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 6,500,000 |  | 6,500,000 |  |
Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 509,000 |  | 509,000 |  |
Performing Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | 14,700,000 |  | 14,700,000 |  |
Loans classified as troubled debt restructured | 4,500,000 |  | $ 4,500,000 |  |
Number of performing loans | SecurityLoan |  |  | 15 |  |
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 1,200,000 |  | $ 1,200,000 |  |
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 | 2,600,000 |  | $ 2,600,000 |  |
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 | 151,000 |  | $ 151,000 |  |
Number of loans | SecurityLoan |  |  | 2 |  |
Performing Financing Receivable [Member] | Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 600,000 |  | $ 600,000 |  |
Number of loans | SecurityLoan |  |  | 1 |  |
Nonperforming Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired, at carrying value | 3,900,000 |  | $ 3,900,000 |  |
Loans classified as troubled debt restructured | 3,900,000 |  | 3,900,000 |  |
Allowance Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans classified as troubled debt restructured | 16,000 |  | 16,000 |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial real estate loans | 3,454,030,000 |  | 3,454,030,000 |  | 3,376,713,000
Dairy & livestock and agribusiness | 268,489,000 |  | 268,489,000 |  | 347,289,000
Impaired, at carrying value |  |  |  |  | 15,500,000
Outstanding balance | 10,182,000 |  | 10,182,000 |  | 10,716,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Dairy & livestock and agribusiness | 231,500,000 |  | 231,500,000 |  | 310,600,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Dairy & livestock and agribusiness | 37,000,000 |  | 37,000,000 |  | 36,700,000
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 204,000 |  | 204,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 800,000 |  | 800,000 |  | 829,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | 204,000 |  | 204,000 |  | 250,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Outstanding balance | $ 574,000 |  | $ 574,000 |  | $ 906,000
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) | 6.15% |  | 6.15% |  | 6.10%
Commercial real estate loans | $ 212,500,000 |  | $ 212,500,000 |  | $ 206,100,000
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 | 123,700,000 |  | 123,700,000 |  | 118,200,000
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 | $ 88,800,000 |  | $ 88,800,000 |  | $ 87,900,000

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