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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, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 14,457	$ 29,905	$ 15,146
Recorded Investment, With a related allowance recorded	0	144	379
Recorded Investment, Total impaired loans	14,457	30,049	15,525
Unpaid Principal Balance, With no related allowance recorded	18,068	35,951	18,702
Unpaid Principal Balance, With a related allowance recorded	0	161	409
Unpaid Principal Balance, Total impaired loans	18,068	36,112	19,111
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	97	75
Related Allowance, Total impaired loans	0	97	75
Average Recorded Investment, With no related allowance recorded	14,688	30,209
Average Recorded Investment, With a related allowance recorded	0	162
Average Recorded Investment, Total impaired loans	14,688	30,371
Interest Income Recognized, With no related allowance recorded	61	495
Interest Income Recognized, With a related allowance recorded	0	2
Interest Income Recognized, Total impaired loans	61	497
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	432	1,015	440
Recorded Investment, With a related allowance recorded	0	135	0
Unpaid Principal Balance, With no related allowance recorded	986	1,985	980
Unpaid Principal Balance, With a related allowance recorded	0	136	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	88	0
Average Recorded Investment, With no related allowance recorded	461	1,045
Average Recorded Investment, With a related allowance recorded	0	152
Interest Income Recognized, With no related allowance recorded	2	6
Interest Income Recognized, With a related allowance recorded	0	2
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,201	1,917	1,530
Recorded Investment, With a related allowance recorded	0	9	1
Unpaid Principal Balance, With no related allowance recorded	1,327	2,272	1,699
Unpaid Principal Balance, With a related allowance recorded	0	25	18
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	9	1
Average Recorded Investment, With no related allowance recorded	1,220	1,960
Average Recorded Investment, With a related allowance recorded	0	10
Interest Income Recognized, With no related allowance recorded	12	16
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	4,332	6,669	4,365
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,755	7,081	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	4,348	6,434
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	32
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	3,660	13,547	3,768
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	5,033	16,198	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	3,715	13,479
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	22	401
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	384	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	402	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	384
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	3,576	4,248	4,040
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,236	5,024	4,692
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	3,599	4,259
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	25	34
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	818	1,324	829
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	1,091	1,610	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	826	1,839
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	438	801	174
Recorded Investment, With a related allowance recorded	0	0	378
Unpaid Principal Balance, With no related allowance recorded	640	1,379	370
Unpaid Principal Balance, With a related allowance recorded	0	0	391
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	$ 74
Average Recorded Investment, With no related allowance recorded	519	809
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	5
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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