Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Interest and fees on loans		$ 11,568	$ 9,887	$ 33,461	$ 29,029
Interest on taxable securities		1,209	1,049	3,696	2,710
Interest on tax-exempt securities		400	551	1,276	1,615
Interest on interest-bearing deposits in other banks		254	278	518	548
Total interest income		13,431	11,765	38,951	33,902
Interest expense:
Interest on demand deposits		276	196	712	528
Interest on savings deposits		73	52	196	146
Interest on certificates of deposit		465	567	1,448	1,641
Interest on Federal Home Loan Bank of San Francisco borrowings		121		435	3
Interest on other borrowings		265	292	825	880
Interest on junior subordinated debentures		104	74	283	211
Total interest expense		1,304	1,181	3,899	3,409
Net interest income		12,127	10,584	35,052	30,493
Provision for loan and lease losses					500
Net interest income after provision for loan and lease losses		12,127	10,584	35,052	29,993
Noninterest income:
Fees on payroll and benefit processing		159	147	474	485
Life insurance		128	134	384	915
Gain on sale of investment securities, net		1	38	41	139
Federal Home Loan Bank of San Francisco dividends		104	80	279	237
(Loss) gain on sale of OREO		(7)	81	9	22
Other income		106	191	331	516
Total noninterest income		943	1,076	2,887	3,542
Noninterest expense:
Salaries and related benefits		4,529	4,291	13,897	13,296
Premises and equipment		1,017	1,067	3,104	3,169
Federal Deposit Insurance Corporation insurance premium		94	78	283	230
Data processing fees		518	437	1,421	1,294
Professional service fees		336	276	995	1,119
Telecommunications		55	219	449	653
Other expenses		1,085	989	3,189	3,312
Total noninterest expense		7,634	7,357	23,338	23,073
Income before provision for income taxes		5,436	4,303	14,601	10,462
Provision for income taxes		1,404	1,427	3,710	3,125
Net income		$ 4,032	$ 2,876	$ 10,891	$ 7,337
Earnings per share - basic (in dollars per share)		$ 0.25	$ 0.18	$ 0.67	$ 0.49
Weighted average shares - basic (in shares)	[1]	16,252	16,191	16,242	14,884
Earnings per share - diluted (in dollars per share)		$ 0.25	$ 0.18	$ 0.67	$ 0.49
Weighted average shares - diluted (in shares)		16,342	16,288	16,327	14,984
Deposit Account [Member]
Noninterest income:
Revenue from Contract with Customer		$ 170	$ 132	$ 521	$ 401
Credit and Debit Card [Member]
Noninterest income:
Revenue from Contract with Customer		$ 282	$ 273	$ 848	$ 827

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