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Loans receivable percentage of portfolio.

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Reserve for undisbursed commitments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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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.

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Amount before allowance of loans issued to agricultural institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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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