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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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 14,696	$ 28,253	$ 15,146
Recorded Investment, With a related allowance recorded	16	543	379
Recorded Investment, Total impaired loans	14,712	28,796	15,525
Unpaid Principal Balance, With no related allowance recorded	18,474	33,039	18,702
Unpaid Principal Balance, With a related allowance recorded	16	612	409
Unpaid Principal Balance, Total impaired loans	18,490	33,651	19,111
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	16	113	75
Related Allowance, Total impaired loans	16	113	75
Average Recorded Investment, With no related allowance recorded	15,024	28,375
Average Recorded Investment, With a related allowance recorded	16	565
Average Recorded Investment, Total impaired loans	15,040	28,940
Interest Income Recognized, With no related allowance recorded	126	995
Interest Income Recognized, With a related allowance recorded	0	1
Interest Income Recognized, Total impaired loans	126	996
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	355	1,465	440
Recorded Investment, With a related allowance recorded	0	140	0
Unpaid Principal Balance, With no related allowance recorded	864	1,939	980
Unpaid Principal Balance, With a related allowance recorded	0	187	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	13	0
Average Recorded Investment, With no related allowance recorded	378	1,572
Average Recorded Investment, With a related allowance recorded	0	157
Interest Income Recognized, With no related allowance recorded	4	13
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	1,174	2,472	1,530
Recorded Investment, With a related allowance recorded	0	6	1
Unpaid Principal Balance, With no related allowance recorded	1,302	2,750	1,699
Unpaid Principal Balance, With a related allowance recorded	0	23	18
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	6	1
Average Recorded Investment, With no related allowance recorded	1,204	2,538
Average Recorded Investment, With a related allowance recorded	0	9
Interest Income Recognized, With no related allowance recorded	23	32
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	4,294	5,541	4,365
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,747	5,866	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	4,331	5,240
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	69
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	3,447	13,017	3,768
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,894	15,469	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	3,565	12,908
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	44	798
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	4,120	4,195	4,040
Recorded Investment, With a related allowance recorded	13	0	0
Unpaid Principal Balance, With no related allowance recorded	4,860	4,983	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	4,159	4,242
Average Recorded Investment, With a related allowance recorded	13	0
Interest Income Recognized, With no related allowance recorded	55	73
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	800	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	819	1,123
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	506	734	174
Recorded Investment, With a related allowance recorded	3	397	378
Unpaid Principal Balance, With no related allowance recorded	716	941	370
Unpaid Principal Balance, With a related allowance recorded	3	402	391
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	3	94	$ 74
Average Recorded Investment, With no related allowance recorded	568	752
Average Recorded Investment, With a related allowance recorded	3	399
Interest Income Recognized, With no related allowance recorded	0	9
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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