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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, 2016 USD ($) Contract	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	2	5	4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 779	$ 2,698	$ 1,109	$ 3,058
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	779	2,698	1,109	3,058
Troubled debt restructurings, Outstanding Recorded Investment	773	2,683	1,167	3,023
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 28	$ 12
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	0	0	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 112	$ 30
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	112	30
Troubled debt restructurings, Outstanding Recorded Investment	0	0	184	15
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 12
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	1	0	2	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 20	$ 0	$ 214	$ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	20	0	214	330
Troubled debt restructurings, Outstanding Recorded Investment	14	0	202	325
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	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	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] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	1	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 2,376	$ 0	$ 2,376
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	2,376	0	2,376
Troubled debt restructurings, Outstanding Recorded Investment	0	2,353	0	2,353
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	1	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 759	$ 0	$ 759	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	759	0	759	0
Troubled debt restructurings, Outstanding Recorded Investment	759	0	759	0
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	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 24	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	24	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	22	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	0	1	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 322	$ 0	$ 322
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	322	0	322
Troubled debt restructurings, Outstanding Recorded Investment	0	330	0	330
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	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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