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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, 2018 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 627
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	627
Troubled debt restructurings, Outstanding Recorded Investment	587
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Commercial Real Estate Owner Occupied [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Commercial Real Estate Owner Occupied [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Commercial and Industrial [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 38
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	38
Troubled debt restructurings, Outstanding Recorded Investment	20
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Dairy & Livestock and Agribusiness [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Dairy & Livestock and Agribusiness [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
SFR Mortgage [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 311
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	311
Troubled debt restructurings, Outstanding Recorded Investment	300
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Consumer [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0
Troubled debt restructurings, Outstanding Recorded Investment	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 278
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	278
Troubled debt restructurings, Outstanding Recorded Investment	267
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0

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Number of financing receivables that have been modified by troubled debt restructurings.

+ 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 http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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