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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	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 20,100	$ 16,899	$ 15,146
Recorded Investment, With a related allowance recorded	83	409	379
Recorded Investment, Total impaired loans	20,183	17,308	15,525
Unpaid Principal Balance, With no related allowance recorded	25,284	20,616	18,702
Unpaid Principal Balance, With a related allowance recorded	114	434	409
Unpaid Principal Balance, Total impaired loans	25,398	21,050	19,111
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	83	88	75
Related Allowance, Total impaired loans	83	88	75
Average Recorded Investment, With no related allowance recorded	21,798	17,766
Average Recorded Investment, With a related allowance recorded	98	439
Average Recorded Investment, Total impaired loans	21,896	18,205
Interest Income Recognized, With no related allowance recorded	123	277
Interest Income Recognized, With a related allowance recorded	0	1
Interest Income Recognized, Total impaired loans	123	278
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,168	726	440
Recorded Investment, With a related allowance recorded	0	19	0
Unpaid Principal Balance, With no related allowance recorded	3,829	1,256	980
Unpaid Principal Balance, With a related allowance recorded	0	20	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	2	0
Average Recorded Investment, With no related allowance recorded	3,439	870
Average Recorded Investment, With a related allowance recorded	0	42
Interest Income Recognized, With no related allowance recorded	6	15
Interest Income Recognized, With a related allowance recorded	0	1
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,593	2,270	1,530
Recorded Investment, With a related allowance recorded	0	3	1
Unpaid Principal Balance, With no related allowance recorded	5,779	2,573	1,699
Unpaid Principal Balance, With a related allowance recorded	0	20	18
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	3	1
Average Recorded Investment, With no related allowance recorded	4,457	2,489
Average Recorded Investment, With a related allowance recorded	0	7
Interest Income Recognized, With no related allowance recorded	34	38
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	615	4,313	4,365
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	726	4,625	4,763
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	644	4,361
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	42
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	5,733	3,855	3,768
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	6,385	5,155	5,107
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	5,904	4,010
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	24	72
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	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
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	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
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no 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	5,479	4,550	4,040
Recorded Investment, With a related allowance recorded	13	0	0
Unpaid Principal Balance, With no related allowance recorded	6,449	5,345	4,692
Unpaid Principal Balance, With a related allowance recorded	13	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	13	0	0
Average Recorded Investment, With no related allowance recorded	5,679	4,620
Average Recorded Investment, With a related allowance recorded	13	0
Interest Income Recognized, With no related allowance recorded	59	109
Interest Income Recognized, With a related allowance recorded	0	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	775	829	829
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	1,091	1,091	1,091
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	808	1,035
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	1
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
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
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no 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	737	356	174
Recorded Investment, With a related allowance recorded	70	387	378
Unpaid Principal Balance, With no related allowance recorded	1,025	571	370
Unpaid Principal Balance, With a related allowance recorded	101	394	391
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	70	83	$ 74
Average Recorded Investment, With no related allowance recorded	867	381
Average Recorded Investment, With a related allowance recorded	85	390
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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