Deposits

Deposits at December 31, 2019 and 2018 consisted of the following classifications:



	At December 31, 2019				At December 31, 2018
	Amount		Average Rate		Amount		Average Rate
	(Dollars in thousands)
Non-interest bearing demand	$	47,935	—	%	$	46,690	—	%
Interest demand	141,935		1.19		134,123		1.01
Savings	99,036		0.73		102,740		0.63
Money market demand	27,692		1.38		16,171		0.78
Certificates of deposit	156,154		1.99		120,855		1.77
	$	472,752	1.25	%	$	420,579	1.01	%

A summary of certificates of deposit by maturity at December 31, 2019 and 2018 is as follows:



	At December 31, 2019		At December 31, 2018
	(Dollars in thousands)
Within one year	$	96,101	$	39,790
One to two years	44,279		34,407
Two to three years	10,908		31,947
Three to four years	3,109		10,552
Four to five years	863		2,949
Thereafter	894		1,210
	$	156,154	$	120,855

The aggregate amount of certificates of deposit with a minimum denomination of $250,000 was approximately $22.4 million and $18.1 million at December 31, 2019 and 2018, respectively. Generally, deposits in excess of $250,000 are not insured by the FDIC.

A summary of interest expense on deposits for the years ended December 31, 2019 and 2018 is as follows:



	Year Ended December 31,
	2019		2018
	(Dollars in thousands)
Interest demand and money market demand	$	1,670	$	1,257
Savings and club	735		548
Certificates of deposit	2,877		2,029
	$	5,282	$	3,834