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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 15,146	$ 26,018	$ 54,757
Recorded Investment, With a related allowance recorded	379	367	8,949
Recorded Investment, Total impaired loans	15,525	26,385	63,706
Unpaid Principal Balance, With no related allowance recorded	18,702	32,198	61,984
Unpaid Principal Balance, With a related allowance recorded	409	383	9,078
Unpaid Principal Balance, Total impaired loans	19,111	32,581	71,062
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	75	141	669
Related Allowance, Total impaired loans	75	141	669
Average Recorded Investment, With no related allowance recorded	15,820	26,406	56,192
Average Recorded Investment, With a related allowance recorded	391	439	8,985
Average Recorded Investment, Total impaired loans	16,211	26,845	65,177
Interest Income Recognized, With no related allowance recorded	306	938	2,276
Interest Income Recognized, With a related allowance recorded	0	23	400
Interest Income Recognized, Total impaired loans	306	961	2,676
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	440	730	1,017
Recorded Investment, With a related allowance recorded	0	171	626
Unpaid Principal Balance, With no related allowance recorded	980	1,646	1,894
Unpaid Principal Balance, With a related allowance recorded	0	171	695
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	114	626
Average Recorded Investment, With no related allowance recorded	548	832	1,122
Average Recorded Investment, With a related allowance recorded	0	233	637
Interest Income Recognized, With no related allowance recorded	10	26	38
Interest Income Recognized, With a related allowance recorded	0	9	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,530	3,386	3,207
Recorded Investment, With a related allowance recorded	1	196	41
Unpaid Principal Balance, With no related allowance recorded	1,699	4,189	3,877
Unpaid Principal Balance, With a related allowance recorded	18	212	47
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	1	27	10
Average Recorded Investment, With no related allowance recorded	1,598	3,709	3,333
Average Recorded Investment, With a related allowance recorded	6	206	45
Interest Income Recognized, With no related allowance recorded	47	50	51
Interest Income Recognized, With a related allowance recorded	0	14	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,365	1,797	6,252
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,763	2,276	7,445
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	4,414	1,410	6,718
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	36	70	97
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	3,768	13,331	34,041
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	5,107	15,842	37,177
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,951	13,517	34,639
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	94	592	1,787
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	0	0
Recorded Investment, With a related allowance recorded	0	0	7,651
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	7,651
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	13
Average Recorded Investment, With no related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	7,651
Interest Income Recognized, With no related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	388
Construction Non-speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no 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	4,040	5,174	5,665
Recorded Investment, With a related allowance recorded	0	0	588
Unpaid Principal Balance, With no related allowance recorded	4,692	6,075	6,453
Unpaid Principal Balance, With a related allowance recorded	0	0	640
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	20
Average Recorded Investment, With no related allowance recorded	4,119	5,327	5,771
Average Recorded Investment, With a related allowance recorded	0	0	607
Interest Income Recognized, With no related allowance recorded	118	135	109
Interest Income Recognized, With a related allowance recorded	0	0	12
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	829	747	3,685
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	1,091	747	3,684
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	988	692	3,687
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	1	47	177
Interest Income Recognized, With a related allowance recorded	0	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
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no 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	174	853	890
Recorded Investment, With a related allowance recorded	378	0	43
Unpaid Principal Balance, With no related allowance recorded	370	1,423	1,454
Unpaid Principal Balance, With a related allowance recorded	391	0	45
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	74	0	0
Average Recorded Investment, With no related allowance recorded	202	919	922
Average Recorded Investment, With a related allowance recorded	385	0	45
Interest Income Recognized, With no related allowance recorded	0	18	17
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0	$ 0

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