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 ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 7,811,000	$ 20,067,000	$ 15,146,000
Recorded Investment, With a related allowance recorded	578,000	3,478,000	379,000
Recorded Investment, Total impaired loans	8,389,000	23,545,000	15,525,000
Unpaid Principal Balance, With no related allowance recorded	9,075,000	29,028,000	18,702,000
Unpaid Principal Balance, With a related allowance recorded	671,000	3,513,000	409,000
Unpaid Principal Balance, Total impaired loans	9,746,000	32,541,000	19,111,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	508,000	561,000	75,000
Related Allowance, Total impaired loans	508,000	561,000	75,000
Average Recorded Investment, With no related allowance recorded	8,383,000	22,789,000	15,820,000
Average Recorded Investment, With a related allowance recorded	1,026,000	3,501,000	391,000
Average Recorded Investment, Total impaired loans	9,409,000	26,290,000	16,211,000
Interest Income Recognized, With no related allowance recorded	157,000	163,000	306,000
Interest Income Recognized, With a related allowance recorded	0	0	0
Interest Income Recognized, Total impaired loans	157,000	163,000	306,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,091,000	7,436,000	440,000
Recorded Investment, With a related allowance recorded	253,000	189,000	0
Unpaid Principal Balance, With no related allowance recorded	1,261,000	11,457,000	980,000
Unpaid Principal Balance, With a related allowance recorded	347,000	191,000	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	251,000	3,000	0
Average Recorded Investment, With no related allowance recorded	1,369,000	7,718,000	548,000
Average Recorded Investment, With a related allowance recorded	699,000	203,000	0
Interest Income Recognized, With no related allowance recorded	4,000	7,000	10,000
Interest Income Recognized, With a related allowance recorded	0	0	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,243,000	3,467,000	1,530,000
Recorded Investment, With a related allowance recorded	325,000	0	1,000
Unpaid Principal Balance, With no related allowance recorded	2,734,000	5,746,000	1,699,000
Unpaid Principal Balance, With a related allowance recorded	324,000	0	18,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	257,000	0	1,000
Average Recorded Investment, With no related allowance recorded	2,389,000	3,919,000	1,598,000
Average Recorded Investment, With a related allowance recorded	327,000	0	6,000
Interest Income Recognized, With no related allowance recorded	41,000	44,000	47,000
Interest Income Recognized, With a related allowance recorded	0	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	479,000	589,000	4,365,000
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	613,000	705,000	4,763,000
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	505,000	624,000	4,414,000
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	0	36,000
Interest Income Recognized, With a related allowance recorded	0	0	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	642,000	2,808,000	3,768,000
Recorded Investment, With a related allowance recorded	0	3,143,000	0
Unpaid Principal Balance, With no related allowance recorded	643,000	4,324,000	5,107,000
Unpaid Principal Balance, With a related allowance recorded	0	3,144,000	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	478,000	0
Average Recorded Investment, With no related allowance recorded	681,000	4,585,000	3,951,000
Average Recorded Investment, With a related allowance recorded	0	3,144,000	0
Interest Income Recognized, With no related allowance recorded	26,000	32,000	94,000
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,979,000	5,349,000	4,040,000
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	3,310,000	6,270,000	4,692,000
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	3,043,000	5,484,000	4,119,000
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	86,000	80,000	118,000
Interest Income Recognized, With a related allowance recorded	0	0	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	829,000
Recorded Investment, With a related allowance recorded	0	78,000	0
Unpaid Principal Balance, With no related allowance recorded	0	0	1,091,000
Unpaid Principal Balance, With a related allowance recorded	0	78,000	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	12,000	0
Average Recorded Investment, With no related allowance recorded	0	0	988,000
Average Recorded Investment, With a related allowance recorded	0	78,000	0
Interest Income Recognized, With no related allowance recorded	0	0	1,000
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0	0
Interest Income Recognized, With no related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	0	0	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	377,000	418,000	174,000
Recorded Investment, With a related allowance recorded	0	68,000	378,000
Unpaid Principal Balance, With no related allowance recorded	514,000	526,000	370,000
Unpaid Principal Balance, With a related allowance recorded	0	100,000	391,000
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	68,000	74,000
Average Recorded Investment, With no related allowance recorded	396,000	459,000	202,000
Average Recorded Investment, With a related allowance recorded	0	76,000	385,000
Interest Income Recognized, With no related allowance recorded	0	0	0
Interest Income Recognized, With a related allowance recorded	$ 0	$ 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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