Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income:
Interest and fees on loans		$ 13,224	$ 12,847	$ 25,562	$ 24,878
Interest on taxable securities		1,329	1,733	2,911	3,497
Interest on tax-exempt securities		423	328	694	715
Interest on interest-bearing deposits in other banks		21	219	175	464
Total interest income		14,997	15,127	29,342	29,554
Interest expense:
Interest on demand - interest-bearing		85	129	185	255
Interest on money market		317	380	720	669
Interest on savings		95	123	213	234
Interest on certificates of deposit		467	497	931	987
Interest on Federal Home Loan Bank of San Francisco borrowings		5	192	5	247
Interest on other borrowings		184	201	368	440
Interest on junior subordinated debentures		61	110	151	223
Total interest expense		1,214	1,632	2,573	3,055
Net interest income		13,783	13,495	26,769	26,499
Provision for loan and lease losses		1,300	0	4,150	0
Net interest income after provision for loan and lease losses		12,483	13,495	22,619	26,499
Noninterest income:
Payroll and benefit processing fees		143	157	313	328
Life insurance		148	155	271	284
Gain on sale of investment securities, net		140	33	224	125
Federal Home Loan Bank of San Francisco dividends		36	124	166	245
Gain (loss) on sale of OREO		0	18	(23)	41
Other income		73	108	44	196
Total noninterest income		955	1,100	1,847	2,157
Noninterest expense:
Salaries and related benefits		4,965	5,146	10,852	10,875
Premises and equipment		826	928	1,680	1,903
FDIC insurance premium		90	95	126	195
Data processing		585	638	1,116	1,214
Professional services		469	535	803	838
Telecommunications		156	180	327	353
Acquisition and merger		0	376	0	2,306
Other expenses		1,179	1,713	3,149	2,850
Total noninterest expense		8,270	9,611	18,053	20,534
Income before provision for income taxes		5,168	4,984	6,413	8,122
Provision for income taxes		1,321	1,340	1,650	2,172
Net income		$ 3,847	$ 3,644	$ 4,763	$ 5,950
Earnings per share - basic (in dollars per share)		$ 0.23	$ 0.20	$ 0.28	$ 0.33
Weighted average shares - basic (in shares)	[1]	16,660	18,134	17,178	17,816
Earnings per share - diluted (in dollars per share)		$ 0.23	$ 0.20	$ 0.28	$ 0.33
Weighted average shares - diluted (in shares)		16,689	18,194	17,217	17,878
Deposit Account [Member]
Noninterest income:
Revenue from Contract with Customer		$ 152	$ 187	$ 321	$ 355
Credit and Debit Card [Member]
Noninterest income:
Revenue from Contract with Customer		$ 263	$ 318	$ 531	$ 583

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