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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract	Dec. 31, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	3,000		2,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 627	$ 5,127
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		627	5,127
Troubled debt restructurings, Outstanding Recorded Investment		587	3,221
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0
Commercial and Industrial [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		0	$ 0
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1,000		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		38	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		38	0
Troubled debt restructurings, Outstanding Recorded Investment		20	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0
Commercial Real Estate Owner Occupied [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 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	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		0	$ 0
Commercial Real Estate Non-owner Occupied [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	$ 0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		0
Commercial Real Estate Non-owner Occupied [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		1,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		0	$ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	3,143
Troubled debt restructurings, Outstanding Recorded Investment		0	3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications		0	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	0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		0	$ 0
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1,000
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
Dairy & Livestock and Agribusiness [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment			$ 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		1,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment			$ 1,984
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment			1,984
Troubled debt restructurings, Outstanding Recorded Investment			$ 78
Consumer [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	0	$ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1,000		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 278	0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	278	0	0
Troubled debt restructurings, Outstanding Recorded Investment	267	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0

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