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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Excluding PCI Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, Total impaired loans	$ 63,706	$ 85,792	$ 106,909
Unpaid Principal Balance, Total impaired loans	71,062	100,527	118,157
Related Allowance, Total impaired loans	669	1,549	3,174
Average Recorded Investment, Total impaired loans	65,177	89,031	111,263
Interest Income Recognized, Total impaired loans	2,676	3,234	3,059
Recorded Investment, With no related allowance recorded	54,757	81,905	93,932
Unpaid Principal Balance, With no related allowance recorded	61,984	95,968	104,487
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	56,192	86,433	97,003
Interest Income Recognized, With no related allowance recorded	2,276	3,234	2,850
Recorded Investment, With a related allowance recorded	8,949	3,887	12,977
Unpaid Principal Balance, With a related allowance recorded	9,078	4,559	13,670
Related Allowance, With a related allowance recorded	669	1,549	3,174
Average Recorded Investment, With a related allowance recorded	8,985	2,598	14,260
Interest Income Recognized, With a related allowance recorded	400	0	209
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,017	2,391	3,055
Unpaid Principal Balance, With no related allowance recorded	1,894	3,624	3,843
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	1,122	2,487	3,248
Interest Income Recognized, With no related allowance recorded	38	41	66
Recorded Investment, With a related allowance recorded	626	629	293
Unpaid Principal Balance, With a related allowance recorded	695	698	301
Related Allowance, With a related allowance recorded	626	615	293
Average Recorded Investment, With a related allowance recorded	637	552	305
Interest Income Recognized, With a related allowance recorded	0	0	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,207	1,853	1,613
Unpaid Principal Balance, With no related allowance recorded	3,877	2,197	2,084
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,333	1,886	1,717
Interest Income Recognized, With no related allowance recorded	51	53
Recorded Investment, With a related allowance recorded	41	1,327	72
Unpaid Principal Balance, With a related allowance recorded	47	1,591	78
Related Allowance, With a related allowance recorded	10	296	72
Average Recorded Investment, With a related allowance recorded	45	714	81
Interest Income Recognized, With a related allowance recorded	0	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	6,252	16,961	13,041
Unpaid Principal Balance, With no related allowance recorded	7,445	18,166	14,133
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	6,718	18,027	13,463
Interest Income Recognized, With no related allowance recorded	97	938	548
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	34,041	30,068	20,399
Unpaid Principal Balance, With no related allowance recorded	37,177	38,156	26,155
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	34,639	30,133	21,313
Interest Income Recognized, With no related allowance recorded	1,787	723	817
Recorded Investment, With a related allowance recorded	0	982	0
Unpaid Principal Balance, With a related allowance recorded	0	1,278	0
Related Allowance, With a related allowance recorded	0	154	0
Average Recorded Investment, With a related allowance recorded	0	573	0
Interest Income Recognized, With a related allowance recorded	0	0	0
Construction Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	7,651	17,617
Unpaid Principal Balance, With no related allowance recorded	0	7,651	18,408
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	7,651	18,043
Interest Income Recognized, With no related allowance recorded	0	310	310
Recorded Investment, With a related allowance recorded	7,651	0	0
Unpaid Principal Balance, With a related allowance recorded	7,651	0	0
Related Allowance, With a related allowance recorded	13	0	0
Average Recorded Investment, With a related allowance recorded	7,651	0	0
Interest Income Recognized, With a related allowance recorded	388	0	0
Construction Non-speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	9,201
Unpaid Principal Balance, With no related allowance recorded	0	0	9,201
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0	9,217
Interest Income Recognized, With no related allowance recorded	0	0	572
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	5,665	6,512	10,919
Unpaid Principal Balance, With no related allowance recorded	6,453	7,493	12,516
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	5,771	6,566	10,408
Interest Income Recognized, With no related allowance recorded	109	110	103
Recorded Investment, With a related allowance recorded	588	467	486
Unpaid Principal Balance, With a related allowance recorded	640	484	489
Related Allowance, With a related allowance recorded	20	35	103
Average Recorded Investment, With a related allowance recorded	607	474	479
Interest Income Recognized, With a related allowance recorded	12	0	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,685	15,796	17,702
Unpaid Principal Balance, With no related allowance recorded	3,684	17,587	17,702
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,687	19,060	19,205
Interest Income Recognized, With no related allowance recorded	177	1,057	434
Recorded Investment, With a related allowance recorded	0	0	12,110
Unpaid Principal Balance, With a related allowance recorded	0	0	12,783
Related Allowance, With a related allowance recorded	0	0	2,702
Average Recorded Investment, With a related allowance recorded	0	0	13,377
Interest Income Recognized, With a related allowance recorded	0	0	209
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	0	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	890	673	385
Unpaid Principal Balance, With no related allowance recorded	1,454	1,094	445
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	922	623	389
Interest Income Recognized, With no related allowance recorded	17	2	0
Recorded Investment, With a related allowance recorded	43	482	16
Unpaid Principal Balance, With a related allowance recorded	45	508	19
Related Allowance, With a related allowance recorded	0	449	4
Average Recorded Investment, With a related allowance recorded	45	285	18
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0	$ 0

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