Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 12,051	$ 14,696	$ 20,067
Recorded Investment, With a related allowance recorded	2,455	16	3,478
Recorded Investment, Total impaired loans	14,506	14,712	23,545
Unpaid Principal Balance, With no related allowance recorded	14,557	18,474	29,028
Unpaid Principal Balance, With a related allowance recorded	2,800	16	3,513
Unpaid Principal Balance, Total impaired loans	17,357	18,490	32,541
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	371	16	561
Related Allowance, Total impaired loans	371	16	561
Average Recorded Investment, With no related allowance recorded	11,608	15,024
Average Recorded Investment, With a related allowance recorded	2,432	16
Average Recorded Investment, Total impaired loans	14,040	15,040
Interest Income Recognized, With no related allowance recorded	79	126
Interest Income Recognized, With a related allowance recorded	0	0
Interest Income Recognized, Total impaired loans	79	126
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	898	355	7,436
Recorded Investment, With a related allowance recorded	1,190	0	189
Unpaid Principal Balance, With no related allowance recorded	1,033	864	11,457
Unpaid Principal Balance, With a related allowance recorded	1,263	0	191
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	276	0	3
Average Recorded Investment, With no related allowance recorded	1,022	378
Average Recorded Investment, With a related allowance recorded	1,251	0
Interest Income Recognized, With no related allowance recorded	2	4
Interest Income Recognized, With a related allowance recorded	0	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,369	1,174	3,467
Recorded Investment, With a related allowance recorded	1,263	0	0
Unpaid Principal Balance, With no related allowance recorded	5,714	1,302	5,746
Unpaid Principal Balance, With a related allowance recorded	1,534	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	93	0	0
Average Recorded Investment, With no related allowance recorded	3,703	1,204
Average Recorded Investment, With a related allowance recorded	1,179	0
Interest Income Recognized, With no related allowance recorded	21	23
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	502	4,294	589
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	616	4,747	705
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	515	4,331
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
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,029	3,447	2,808
Recorded Investment, With a related allowance recorded	0	0	3,143
Unpaid Principal Balance, With no related allowance recorded	1,209	4,894	4,324
Unpaid Principal Balance, With a related allowance recorded	0	0	3,144
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	478
Average Recorded Investment, With no related allowance recorded	1,068	3,565
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	14	44
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	4,858	4,120	5,349
Recorded Investment, With a related allowance recorded	0	13	0
Unpaid Principal Balance, With no related allowance recorded	5,467	4,860	6,270
Unpaid Principal Balance, With a related allowance recorded	0	13	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	4,893	4,159
Average Recorded Investment, With a related allowance recorded	0	13
Interest Income Recognized, With no related allowance recorded	42	55
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	0	800	0
Recorded Investment, With a related allowance recorded	0	0	78
Unpaid Principal Balance, With no related allowance recorded	0	1,091	0
Unpaid Principal Balance, With a related allowance recorded	0	0	78
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	12
Average Recorded Investment, With no related allowance recorded	0	819
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
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	395	506	418
Recorded Investment, With a related allowance recorded	2	3	68
Unpaid Principal Balance, With no related allowance recorded	518	716	526
Unpaid Principal Balance, With a related allowance recorded	3	3	100
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	2	3	$ 68
Average Recorded Investment, With no related allowance recorded	407	568
Average Recorded Investment, With a related allowance recorded	2	3
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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