Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	2	6	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 112	$ 360	$ 1,200	$ 360
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	112	360	1,200	360
Troubled debt restructurings, Outstanding Recorded Investment	1,133	360	1,133	360
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 12	$ 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	1	1	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 112	$ 30	$ 112	$ 30
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	112	30	112	30
Troubled debt restructurings, Outstanding Recorded Investment	110	30	110	30
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	1	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 330	$ 194	$ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	330	194	330
Troubled debt restructurings, Outstanding Recorded Investment	190	330	190	330
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 12	$ 28	$ 12
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	2	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 812	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	812	0
Troubled debt restructurings, Outstanding Recorded Investment	761	0	761	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	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] | 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
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	2	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 82	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	82	0
Troubled debt restructurings, Outstanding Recorded Investment	72	0	72	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0