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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Agreement	Dec. 31, 2021 USD ($) Agreement
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement	3	4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 5,204	$ 7,340
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	5,204	7,340
Troubled debt restructurings, Outstanding Recorded Investment	5,204	4,253
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial Real Estate Owner Occupied [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 2,453
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		2,453
Troubled debt restructurings, Outstanding Recorded Investment		2,394
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial Real Estate Owner Occupied [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial and Industrial [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement	2	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 3,204	$ 4,887
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,204	4,887
Troubled debt restructurings, Outstanding Recorded Investment	3,204	1,859
Troubled debt restructurings, Financial Effect Resulting From Modifications
Dairy & Livestock and Agribusiness [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,000
Troubled debt restructurings, Outstanding Recorded Investment	2,000
Troubled debt restructurings, Financial Effect Resulting From Modifications
Dairy & Livestock and Agribusiness [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
SFR Mortgage [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Agreement
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Name Accounting Standards Codification
-Topic 310
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-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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