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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, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) Contract	Dec. 31, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	7	7
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 5,127	$ 1,286	$ 4,334
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	5,127	1,286	4,334
Troubled debt restructurings, Outstanding Recorded Investment	3,221	1,240	4,266
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 28	$ 203
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 112	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	112	0
Troubled debt restructurings, Outstanding Recorded Investment	0	103	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	0	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 203
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	203
Troubled debt restructurings, Outstanding Recorded Investment	0	0	203
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 203
Small Business Administration [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	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
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	2	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 214	$ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	214	330
Troubled debt restructurings, Outstanding Recorded Investment	0	196	320
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 28	$ 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
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
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	1	0	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 3,143	$ 0	$ 823
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,143	0	823
Troubled debt restructurings, Outstanding Recorded Investment	3,143	0	821
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 759	$ 2,376
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	759	2,376
Troubled debt restructurings, Outstanding Recorded Investment	0	756	2,316
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 280
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	280
Troubled debt restructurings, Outstanding Recorded Investment	0	0	280
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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
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
Dairy & Livestock and Agribusiness [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 1,984	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	1,984	0	0
Troubled debt restructurings, Outstanding Recorded Investment	78	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0
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
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
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 201
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	201
Troubled debt restructurings, Outstanding Recorded Investment	0	185
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			1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment			$ 322
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment			322
Troubled debt restructurings, Outstanding Recorded Investment			326
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			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

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