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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, 2018 USD ($) Contract	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	3	2	7
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 627	$ 5,127	$ 1,286
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	627	5,127	1,286
Troubled debt restructurings, Outstanding Recorded Investment	587	3,221	1,240
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 28
Commercial and Industrial [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	$ 112
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	112
Troubled debt restructurings, Outstanding Recorded Investment	0	0	103
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 38	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	38	0	0
Troubled debt restructurings, Outstanding Recorded Investment	20	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
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
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract			2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment			$ 214
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment			214
Troubled debt restructurings, Outstanding Recorded Investment			196
Troubled debt restructurings, Financial Effect Resulting From Modifications			$ 28
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
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
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	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 3,143	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	3,143	0
Troubled debt restructurings, Outstanding Recorded Investment	0	3,143	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	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 759
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	759
Troubled debt restructurings, Outstanding Recorded Investment	0	0	756
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	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
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0
SFR Mortgage [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
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 311	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	311	0
Troubled debt restructurings, Outstanding Recorded Investment	300	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
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	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 1,984	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	1,984	0
Troubled debt restructurings, Outstanding Recorded Investment	0	78	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
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
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1	0	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 278	$ 0	$ 201
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	278	0	201
Troubled debt restructurings, Outstanding Recorded Investment	267	0	185
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0

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