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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 20,067	$ 15,146	$ 26,018
Recorded Investment, With a related allowance recorded	3,478	379	367
Recorded Investment, Total impaired loans	23,545	15,525	26,385
Unpaid Principal Balance, With no related allowance recorded	29,028	18,702	32,198
Unpaid Principal Balance, With a related allowance recorded	3,513	409	383
Unpaid Principal Balance, Total impaired loans	32,541	19,111	32,581
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	561	75	141
Related Allowance, Total impaired loans	561	75	141
Average Recorded Investment, With no related allowance recorded	22,789	15,820	26,406
Average Recorded Investment, With a related allowance recorded	3,501	391	439
Average Recorded Investment, Total impaired loans	26,290	16,211	26,845
Interest Income Recognized, With no related allowance recorded	163	306	938
Interest Income Recognized, With a related allowance recorded	0	0	23
Interest Income Recognized, Total impaired loans	163	306	961
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	7,436	440	730
Recorded Investment, With a related allowance recorded	189	0	171
Unpaid Principal Balance, With no related allowance recorded	11,457	980	1,646
Unpaid Principal Balance, With a related allowance recorded	191	0	171
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	3	0	114
Average Recorded Investment, With no related allowance recorded	7,718	548	832
Average Recorded Investment, With a related allowance recorded	203	0	233
Interest Income Recognized, With no related allowance recorded	7	10	26
Interest Income Recognized, With a related allowance recorded	0	0	9
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,467	1,530	3,386
Recorded Investment, With a related allowance recorded		1	196
Unpaid Principal Balance, With no related allowance recorded	5,746	1,699	4,189
Unpaid Principal Balance, With a related allowance recorded	0	18	212
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	1	27
Average Recorded Investment, With no related allowance recorded	3,919	1,598	3,709
Average Recorded Investment, With a related allowance recorded	0	6	206
Interest Income Recognized, With no related allowance recorded	44	47	50
Interest Income Recognized, With a related allowance recorded	0	0	14
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	589	4,365	1,797
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	705	4,763	2,276
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	624	4,414	1,410
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	36	70
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	2,808	3,768	13,331
Recorded Investment, With a related allowance recorded	3,143	0	0
Unpaid Principal Balance, With no related allowance recorded	4,324	5,107	15,842
Unpaid Principal Balance, With a related allowance recorded	3,144	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	478	0	0
Average Recorded Investment, With no related allowance recorded	4,585	3,951	13,517
Average Recorded Investment, With a related allowance recorded	3,144	0	0
Interest Income Recognized, With no related allowance recorded	32	94	592
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	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
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	5,349	4,040	5,174
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	6,270	4,692	6,075
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	5,484	4,119	5,327
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	80	118	135
Interest Income Recognized, With a related allowance recorded	0	0	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	829	747
Recorded Investment, With a related allowance recorded	78	0	0
Unpaid Principal Balance, With no related allowance recorded	0	1,091	747
Unpaid Principal Balance, With a related allowance recorded	78	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	12	0	0
Average Recorded Investment, With no related allowance recorded	0	988	692
Average Recorded Investment, With a related allowance recorded	78	0	0
Interest Income Recognized, With no related allowance recorded	0	1	47
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	418	174	853
Recorded Investment, With a related allowance recorded	68	378	0
Unpaid Principal Balance, With no related allowance recorded	526	370	1,423
Unpaid Principal Balance, With a related allowance recorded	100	391	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	68	74	0
Average Recorded Investment, With no related allowance recorded	459	202	919
Average Recorded Investment, With a related allowance recorded	76	385	0
Interest Income Recognized, With no related allowance recorded	0	0	18
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0	$ 0

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