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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	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2017 USD ($) Contract	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	0	2	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 349	$ 0	$ 349	$ 5,209
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	349	0	349	5,209
Troubled debt restructurings, Outstanding Recorded Investment	338	0	338	3,299
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 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	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 38	$ 0	$ 38	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	38	0	38	0
Troubled debt restructurings, Outstanding Recorded Investment	31	0	31	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 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	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 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	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	3,143
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 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	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 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	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
SFR Mortgage [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 311	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	311	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	307	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 311	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	311	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	307	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Dairy & Livestock and Agribusiness [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 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	0	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 1,984
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	1,984
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	78
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	82
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	78
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0

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