Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Interest and fees on loans		$ 13,448	$ 13,013	$ 39,010	$ 37,891
Interest on taxable securities		1,284	1,609	4,195	5,106
Interest on tax-exempt securities		457	271	1,151	986
Interest on interest-bearing deposits in other banks		29	308	204	772
Total interest income		15,218	15,201	44,560	44,755
Interest expense:
Interest on demand - interest-bearing		71	117	256	372
Interest on money market		289	451	1,009	1,120
Interest on savings		74	131	287	365
Interest on certificates of deposit		420	491	1,351	1,478
Interest on Federal Home Loan Bank of San Francisco borrowings		0	0	5	247
Interest on other borrowings		184	183	552	623
Interest on junior subordinated debentures		50	106	201	329
Total interest expense		1,088	1,479	3,661	4,534
Net interest income		14,130	13,722	40,899	40,221
Provision for loan and lease losses		1,100	0	5,250	0
Net interest income after provision for loan and lease losses		13,030	13,722	35,649	40,221
Noninterest income:
Payroll and benefit processing fees		152	158	465	486
Life insurance		125	126	396	410
Gain on sale of investment securities, net		258	12	482	137
Federal Home Loan Bank of San Francisco dividends		109	131	275	376
(Loss) gain on sale of OREO		0	0	(23)	41
Other income		106	109	150	305
Total noninterest income		1,189	1,006	3,036	3,163
Noninterest expense:
Salaries and related benefits		5,126	5,005	15,978	15,880
Premises and equipment		951	933	2,631	2,836
FDIC insurance premium		101	(104)	227	91
Data processing		581	582	1,697	1,796
Professional services		342	392	1,145	1,230
Telecommunications		157	194	484	547
Acquisition and merger		0	(113)	0	2,193
Other expenses		1,132	1,411	4,281	4,261
Total noninterest expense		8,390	8,300	26,443	28,834
Income before provision for income taxes		5,829	6,428	12,242	14,550
Provision for income taxes		1,500	1,786	3,150	3,958
Net income		$ 4,329	$ 4,642	$ 9,092	$ 10,592
Earnings per share - basic (in dollars per share)		$ 0.26	$ 0.26	$ 0.53	$ 0.59
Weighted average shares - basic (in shares)	[1]	16,660	18,130	17,004	17,918
Earnings per share - diluted (in dollars per share)		$ 0.26	$ 0.26	$ 0.53	$ 0.59
Weighted average shares - diluted (in shares)		16,696	18,196	17,044	17,981
Deposit Account [Member]
Noninterest income:
Revenue from Contract with Customer		$ 142	$ 177	$ 463	$ 532
Credit and Debit Card [Member]
Noninterest income:
Revenue from Contract with Customer		$ 297	$ 293	$ 828	$ 876

[1] Excludes unvested restricted shares because they do not have dividend or voting rights