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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		9 Months Ended
	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract
Modified Loan [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	0	4	6
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,698	$ 0	$ 3,058	$ 4,140
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,698	0	3,058	4,140
Troubled debt restructurings, Outstanding Recorded Investment	3,023	3,993	3,023	3,993
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 12	$ 0
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 368
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	368
Troubled debt restructurings, Outstanding Recorded Investment	0	337	0	337
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	0	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 30	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	30	0
Troubled debt restructurings, Outstanding Recorded Investment	15	0	15	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 12	0
Commercial and Industrial [Member] | Other [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	$ 0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0
Small Business Administration [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
Small Business Administration [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	$ 330	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	330	0
Troubled debt restructurings, Outstanding Recorded Investment	325	0	325	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Small Business Administration [Member] | Other [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] | Interest Rate Reduction [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	$ 199
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	199
Troubled debt restructurings, Outstanding Recorded Investment	0	187	0	187
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	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] | Other [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	1	0	1	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,376	$ 0	$ 2,376	$ 3,573
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,376	0	2,376	3,573
Troubled debt restructurings, Outstanding Recorded Investment	2,353	3,469	2,353	3,469
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
Commercial Real Estate Non-owner Occupied [Member] | Other [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
Single Family Mortgage Loans [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 322		$ 322
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	322		322
Troubled debt restructurings, Outstanding Recorded Investment	330		330
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0		$ 0
Single Family Mortgage Loans [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
Single Family Mortgage Loans [Member] | Other [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
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	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		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	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	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

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