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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, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract	Dec. 31, 2013 USD ($) Contract
American Security Bank [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		6
Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		3
Modified Loan [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	7	8	18
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 4,334	$ 4,746	$ 29,069
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	4,334	4,746	29,069
Troubled debt restructurings, Outstanding Recorded Investment	4,266	4,597	24,719
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 203	$ 185	$ 244
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	3	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 553	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	553	0
Troubled debt restructurings, Outstanding Recorded Investment	0	522	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 185	$ 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	4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 203	$ 0	$ 621
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	203	0	621
Troubled debt restructurings, Outstanding Recorded Investment	203	0	570
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 203	$ 0	$ 95
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	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	330
Troubled debt restructurings, Outstanding Recorded Investment	320
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0
Commercial Real Estate Owner Occupied [Member] | Interest Rate Reduction [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	$ 199	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	199	0
Troubled debt restructurings, Outstanding Recorded Investment	0	187	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	2	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 823	$ 0	$ 168
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	823	0	168
Troubled debt restructurings, Outstanding Recorded Investment	821	0	138
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	1	3	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,376	$ 3,573	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,376	3,573	0
Troubled debt restructurings, Outstanding Recorded Investment	2,316	3,469	0
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	1	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 280	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	280	0	0
Troubled debt restructurings, Outstanding Recorded Investment	280	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0
Single Family Mortgage Loans [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1		3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 322		$ 1,365
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	322		1,365
Troubled debt restructurings, Outstanding Recorded Investment	326		1,349
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
Dairy & Livestock and Agribusiness [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
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	10
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 26,915
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	26,915
Troubled debt restructurings, Outstanding Recorded Investment		0	22,662
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 149
Consumer [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 421
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		421
Troubled debt restructurings, Outstanding Recorded Investment		419
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		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
Construction Speculative [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
Construction Speculative [Member] | Change in Amortization Period or Maturity [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

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