Allocation of reserves to troubled debt restructuring.

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Loans classified as a troubled debt restructured.

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Loans receivable percentage of portfolio.

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Number Of Loans

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Number of performing loans.

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Percentage of PCI loans to Loans receivable.

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Reserve for undisbursed commitments.

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No definition available.

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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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No definition available.

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

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of allowance for credit losses related to recorded investment.

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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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Amount before allowance of mortgage loans on existing land or building. 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, 2019 USD ($) Contract	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2019 USD ($) SecurityLoan Contract	Jun. 30, 2018 USD ($) Contract	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	$ 5,417,351,000		$ 5,417,351,000		$ 5,408,636,000
Dairy & livestock and agribusiness	301,752,000		301,752,000		394,543,000
Total fixed rate loans held	3,810,000,000		3,810,000,000
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank	6,050,000,000.00		6,050,000,000.00		5,710,000,000
Impaired, at carrying value	14,506,000	$ 14,712,000	14,506,000	$ 14,712,000	23,545,000
Impaired, at carrying value	371,000	$ 16,000	$ 371,000	$ 16,000	561,000
Number of performing loans \| SecurityLoan			12
Reserve for credit risk for undisbursed commitments	$ 9,000,000.0		$ 9,000,000.0		9,000,000.0
Allocation of allowance to troubled debt restructuring					$ 490,000,000
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted \| Contract	0	0	0	0
Percentage of PCI loans to Loan Receivable	0.20%		0.20%		0.20%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.08%		77.08%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	71.85%		71.85%
Nonaccrual Small Business Administration Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 2,000,000.0		$ 2,000,000.0
Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	3,500,000		3,500,000
Loans classified as troubled debt restructured	3,500,000		3,500,000
Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,700,000		2,700,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,100,000		1,100,000
Nonaccrual Single Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	5,100,000		5,100,000
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	263,000		263,000
Loans classified as troubled debt restructured	263,000		263,000
Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	14,500,000		14,500,000
Loans classified as troubled debt restructured	3,200,000		3,200,000
Performing Financing Receivable [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	550,000		550,000
Performing Financing Receivable [Member] \| Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	3,200,000		3,200,000
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	2,100,000		$ 2,100,000
Number of loans \| SecurityLoan			8
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	95,000		$ 95,000
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	436,000		$ 436,000
Number of loans \| SecurityLoan			1
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| SecurityLoan			1
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans					$ 5,394,229,000
Dairy & livestock and agribusiness	301,752,000		$ 301,752,000		393,843,000
Impaired, at carrying value					23,500,000
Outstanding balance	11,287,000		11,287,000		19,951,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	245,700,000		245,700,000		340,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	56,100,000		56,100,000		54,000,000.0
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	0		0		78,000
Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,993,000		1,993,000		7,490,000
Loans, Excluding PCI Loans [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 5,082,000		$ 5,082,000		$ 2,892,000
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)	4.16%		4.16%		4.27%
Commercial real estate loans	$ 225,600,000		$ 225,600,000		$ 231,000,000.0
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	122,700,000		122,700,000		126,900,000
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	$ 102,900,000		$ 102,900,000		$ 104,100,000