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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, 2016 USD ($) Contract	Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	7	7	8
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 1,286	$ 4,334	$ 4,746
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	1,286	4,334	4,746
Troubled debt restructurings, Outstanding Recorded Investment	1,240	4,266	4,597
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 28	$ 203	$ 185
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	0	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 112	$ 0	$ 553
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	112	0	553
Troubled debt restructurings, Outstanding Recorded Investment	103	0	522
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 185
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [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	$ 203	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	203	0
Troubled debt restructurings, Outstanding Recorded Investment	0	203	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 203	$ 0
Small Business Administration [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
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 214	$ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	214	330
Troubled debt restructurings, Outstanding Recorded Investment	196	320
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 199
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	199
Troubled debt restructurings, Outstanding Recorded Investment	0	0	187
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	2	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 759	$ 823	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	759	823	0
Troubled debt restructurings, Outstanding Recorded Investment	756	821	0
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	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 2,376	$ 3,573
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	2,376	3,573
Troubled debt restructurings, Outstanding Recorded Investment	0	2,316	3,469
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	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 280	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	280	0
Troubled debt restructurings, Outstanding Recorded Investment	0	280	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		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0		$ 421
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0		421
Troubled debt restructurings, Outstanding Recorded Investment	0		419
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	3		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 201		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	201		0
Troubled debt restructurings, Outstanding Recorded Investment	185		0
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
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

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