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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) pure in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Contract	Mar. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	3	5
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 5,209	$ 1,088,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	5,209	1,088,000
Troubled debt restructurings, Outstanding Recorded Investment	3,301	1,046,000
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 28,000
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	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	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] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	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	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 194,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	194,000
Troubled debt restructurings, Outstanding Recorded Investment	0	193,000
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 28,000
Commercial Real Estate Owner Occupied [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	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	1	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 3,143	$ 812,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,143	812,000
Troubled debt restructurings, Outstanding Recorded Investment	3,143	778,000
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	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] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	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] | 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	$ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	82
Troubled debt restructurings, Outstanding Recorded Investment	80
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		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		2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 82,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		82,000
Troubled debt restructurings, Outstanding Recorded Investment		75,000
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	1
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
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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