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 ($)	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 8,723,000	$ 20,100,000	$ 20,067,000
Recorded Investment, With a related allowance recorded	1,057,000	83,000	3,478,000
Recorded Investment, Total impaired loans	9,780,000	20,183,000	23,545,000
Unpaid Principal Balance, With no related allowance recorded	10,749,000	25,284,000	29,028,000
Unpaid Principal Balance, With a related allowance recorded	1,161,000	114,000	3,513,000
Unpaid Principal Balance, Total impaired loans	11,910,000	25,398,000	32,541,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	540,000	83,000	561,000
Related Allowance, Total impaired loans	540,000	83,000	561,000
Average Recorded Investment, With no related allowance recorded	9,186,000	21,798,000
Average Recorded Investment, With a related allowance recorded	1,645,000	98,000
Average Recorded Investment, Total impaired loans	10,831,000	21,896,000
Interest Income Recognized, With no related allowance recorded	118,000	123,000
Interest Income Recognized, With a related allowance recorded	0	0
Interest Income Recognized, Total impaired loans	118,000	123,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,382,000	3,168,000	7,436,000
Recorded Investment, With a related allowance recorded	256,000	0	189,000
Unpaid Principal Balance, With no related allowance recorded	1,537,000	3,829,000	11,457,000
Unpaid Principal Balance, With a related allowance recorded	345,000	0	191,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	254,000	0	3,000
Average Recorded Investment, With no related allowance recorded	1,560,000	3,439,000
Average Recorded Investment, With a related allowance recorded	829,000	0
Interest Income Recognized, With no related allowance recorded	4,000	6,000
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	2,447,000	3,593,000	3,467,000
Recorded Investment, With a related allowance recorded	801,000	0	0
Unpaid Principal Balance, With no related allowance recorded	3,554,000	5,779,000	5,746,000
Unpaid Principal Balance, With a related allowance recorded	816,000	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	286,000	0	0
Average Recorded Investment, With no related allowance recorded	2,606,000	4,457,000
Average Recorded Investment, With a related allowance recorded	816,000	0
Interest Income Recognized, With no related allowance recorded	31,000	34,000
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	494,000	615,000	589,000
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	614,000	726,000	705,000
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	508,000	644,000
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	1,006,000	5,733,000	2,808,000
Recorded Investment, With a related allowance recorded	0	0	3,143,000
Unpaid Principal Balance, With no related allowance recorded	1,190,000	6,385,000	4,324,000
Unpaid Principal Balance, With a related allowance recorded	0	0	3,144,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	478,000
Average Recorded Investment, With no related allowance recorded	1,052,000	5,904,000
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	21,000	24,000
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	3,009,000	5,479,000	5,349,000
Recorded Investment, With a related allowance recorded	0	13,000	0
Unpaid Principal Balance, With no related allowance recorded	3,338,000	6,449,000	6,270,000
Unpaid Principal Balance, With a related allowance recorded	0	13,000	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	13,000	0
Average Recorded Investment, With no related allowance recorded	3,059,000	5,679,000
Average Recorded Investment, With a related allowance recorded	0	13,000
Interest Income Recognized, With no related allowance recorded	62,000	59,000
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	775,000	0
Recorded Investment, With a related allowance recorded	0	0	78,000
Unpaid Principal Balance, With no related allowance recorded	0	1,091,000	0
Unpaid Principal Balance, With a related allowance recorded	0	0	78,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	12,000
Average Recorded Investment, With no related allowance recorded	0	808,000
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	385,000	737,000	418,000
Recorded Investment, With a related allowance recorded	0	70,000	68,000
Unpaid Principal Balance, With no related allowance recorded	516,000	1,025,000	526,000
Unpaid Principal Balance, With a related allowance recorded	0	101,000	100,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	70,000	$ 68,000
Average Recorded Investment, With no related allowance recorded	401,000	867,000
Average Recorded Investment, With a related allowance recorded	0	85,000
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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