Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

A summary of consolidated financial data for each of the four quarters of 2017, 2016 and 2015 is presented below:

	Quarters in 2017 Ended
	March 31,		June 30,		Sept. 30,		Dec 31,
	(Dollars in thousands, except per share data)
Interest and dividend income	$	6,839	$	7,101	$	7,397	$	7,680
Interest expense	537		516		587		615
Net interest income	6,302		6,585		6,810		7,065
Provision for loan losses	—		—		150		50
Noninterest income	2,233		2,333		2,506		2,323
Noninterest expenses	5,941		5,871		5,941		6,152
Net income	1,930		2,227		2,370		1,922
Earnings per common share	$	0.43	$	0.50	$	0.53	$	0.43

	Quarters in 2016 Ended
	March 31,		June 30,		Sept. 30,		Dec 31,
	(Dollars in thousands, except per share data)
Interest and dividend income	$	6,448	$	6,688	$	6,786	$	6,914
Interest expense	513		519		471		558
Net interest income	5,935		6,169		6,315		6,356
Provision for loan losses	75		75		—		—
Noninterest income	2,186		2,597		2,804		2,553
Noninterest expenses	5,703		5,808		6,024		6,121
Net income	1,759		2,139		2,268		2,345
Earnings per common share	$	0.39	$	0.48	$	0.51	$	0.53

	Quarters in 2015 Ended
	March 31,		June 30,		Sept. 30,		Dec 31,
	(Dollars in thousands, except per share data)
Interest and dividend income	$	6,117	$	6,276	$	6,373	$	6,378
Interest expense	565		521		461		478
Net interest income	5,552		5,755		5,912		5,900
Provision for loan losses	100		150		150		150
Noninterest income	2,335		2,526		2,533		2,398
Noninterest expenses	5,268		5,431		5,556		5,565
Net income	1,884		2,017		2,050		1,927
Earnings per common share	$	0.42	$	0.46	$	0.45	$	0.44