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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	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, Total impaired loans	$ 55,465	$ 68,377	$ 63,706
Unpaid Principal Balance, Total impaired loans	62,955	82,063	71,062
Related Allowance, Total impaired loans	694	794	669
Average Recorded Investment, Total impaired loans	55,632	69,267
Interest Income Recognized, Total impaired loans	557	647
Recorded Investment, With no related allowance recorded	46,513	66,670	54,757
Unpaid Principal Balance, With no related allowance recorded	53,863	79,944	61,984
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	46,525	67,533
Interest Income Recognized, With no related allowance recorded	453	647
Recorded Investment, With a related allowance recorded	8,952	1,707	8,949
Unpaid Principal Balance, With a related allowance recorded	9,092	2,119	9,078
Related Allowance, With a related allowance recorded	694	794	669
Average Recorded Investment, With a related allowance recorded	9,107	1,734
Interest Income Recognized, With a related allowance recorded	104	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	805	1,004	1,017
Unpaid Principal Balance, With no related allowance recorded	1,677	1,819	1,894
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	831	1,017
Interest Income Recognized, With no related allowance recorded	7	8
Recorded Investment, With a related allowance recorded	672	607	626
Unpaid Principal Balance, With a related allowance recorded	741	680	695
Related Allowance, With a related allowance recorded	575	592	626
Average Recorded Investment, With a related allowance recorded	687	617
Interest Income Recognized, With a related allowance recorded	3	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,050	3,117	3,207
Unpaid Principal Balance, With no related allowance recorded	3,765	3,667	3,877
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,089	3,177
Interest Income Recognized, With no related allowance recorded	13	13
Recorded Investment, With a related allowance recorded	254	41	41
Unpaid Principal Balance, With a related allowance recorded	274	54	47
Related Allowance, With a related allowance recorded	55	42	10
Average Recorded Investment, With a related allowance recorded	254	45
Interest Income Recognized, With a related allowance recorded	2	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	5,315	6,117	6,252
Unpaid Principal Balance, With no related allowance recorded	6,507	7,167	7,445
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	5,095	6,185
Interest Income Recognized, With no related allowance recorded	51	64
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
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	30,262	34,808	34,041
Unpaid Principal Balance, With no related allowance recorded	33,368	42,718	37,177
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	30,400	35,194
Interest Income Recognized, With no related allowance recorded	343	350
Recorded Investment, With a related allowance recorded	0	961	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	973
Interest Income Recognized, With a related allowance recorded	0	0
Construction Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	7,651	0
Unpaid Principal Balance, With no related allowance recorded	0	7,651	0
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	7,651
Interest Income Recognized, With no related allowance recorded	0	96
Recorded Investment, With a related allowance recorded	7,651	0	7,651
Unpaid Principal Balance, With a related allowance recorded	7,651	0	7,651
Related Allowance, With a related allowance recorded	48	0	13
Average Recorded Investment, With a related allowance recorded	7,651	0
Interest Income Recognized, With a related allowance recorded	97	0
Construction Non-speculative [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
Interest Income Recognized, With no related allowance recorded	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
Interest Income Recognized, With a related allowance recorded	0	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	5,499	5,913	5,665
Unpaid Principal Balance, With no related allowance recorded	6,406	6,642	6,453
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	5,512	5,940
Interest Income Recognized, With no related allowance recorded	27	27
Recorded Investment, With a related allowance recorded	375	0	588
Unpaid Principal Balance, With a related allowance recorded	426	0	640
Related Allowance, With a related allowance recorded	16	0	20
Average Recorded Investment, With a related allowance recorded	515	0
Interest Income Recognized, With a related allowance recorded	2	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	714	7,277	3,685
Unpaid Principal Balance, With no related allowance recorded	714	8,991	3,684
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	710	7,533
Interest Income Recognized, With no related allowance recorded	8	85
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
Interest Income Recognized, With a related allowance recorded	0	0
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
Interest Income Recognized, With no related allowance recorded	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
Interest Income Recognized, With a related allowance recorded	0	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	868	783	890
Unpaid Principal Balance, With no related allowance recorded	1,420	1,289	1,454
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	888	836
Interest Income Recognized, With no related allowance recorded	4	4
Recorded Investment, With a related allowance recorded	0	98	43
Unpaid Principal Balance, With a related allowance recorded	0	107	45
Related Allowance, With a related allowance recorded	0	6	$ 0
Average Recorded Investment, With a related allowance recorded	0	99
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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