Securities Available for Sale (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) Security	Jun. 30, 2019 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2019 USD ($)
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	$ 159,627,000				$ 176,903,000
Gross unrealized gains	6,026,000				2,993,000
Gross unrealized losses	(1,541,000)				(1,420,000)
Fair Value	$ 164,112,000				178,476,000
Percentage loss of amortized cost	15.10%
Proceeds from sales of investment securities		$ 0
Amortized cost of investment securities by contractual maturity [Abstract]
Due within one year	$ 4,208,000
Due after one year through five years	34,829,000
Due after five years through ten years	21,236,000
Due after ten years	648,000
Mortgage-related securities	98,706,000
Amortized Cost	159,627,000				176,903,000
Fair value of investment securities by contractual maturity [Abstract]
Due within one year	4,244,000
Due after one year through five years	35,902,000
Due after five years through ten years	20,625,000
Due after ten years	838,000
Mortgage-related securities	102,503,000
Fair Value	164,112,000				178,476,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	2,467,000				24,752,000
12 months or longer	8,492,000				18,909,000
Fair value	10,959,000				43,661,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(33,000)				(157,000)
12 months or longer	(1,508,000)				(1,263,000)
Unrealized loss	(1,541,000)				(1,420,000)
Mortgage-Backed Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	28,320,000				33,773,000
Gross unrealized gains	1,392,000				422,000
Gross unrealized losses	0				(45,000)
Fair Value	29,712,000				34,150,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	28,320,000				33,773,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	29,712,000				34,150,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				2,929,000
12 months or longer	0				2,849,000
Fair value	0				5,778,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				(20,000)
12 months or longer	0				(25,000)
Unrealized loss	0				(45,000)
Collateralized Mortgage Obligations, Government Sponsored Enterprise Issued [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	66,610,000				81,232,000
Gross unrealized gains	2,377,000				776,000
Gross unrealized losses	0				(254,000)
Fair Value	68,987,000				81,754,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	66,610,000				81,232,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	68,987,000				81,754,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				21,723,000
12 months or longer	0				7,180,000
Fair value	0				28,903,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				(136,000)
12 months or longer	0				(118,000)
Unrealized loss	0				(254,000)
Collateralized Mortgage Obligations, Private label Issued [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	3,776,000
Gross unrealized gains	28,000
Gross unrealized losses	0
Fair Value	3,804,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	3,776,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	3,804,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0
12 months or longer	0
Fair value	0
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0
12 months or longer	0
Unrealized loss	0
Mortgage-Related Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	98,706,000				115,005,000
Gross unrealized gains	3,797,000				1,198,000
Gross unrealized losses	0				(299,000)
Fair Value	102,503,000				115,904,000
Securities pledged as collateral	1,000,000.0				1,200,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	98,706,000				115,005,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	102,503,000				115,904,000
Municipal Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	48,421,000				51,898,000
Gross unrealized gains	2,229,000				1,795,000
Gross unrealized losses	0				(1,000)
Fair Value	$ 50,650,000				53,692,000
Number of securities that were other-than-temporarily impaired | Security	1
Credit losses charged to earnings with respect to municipal security				$ 77,000
Additional credit loss charged to earnings			$ 17,000
Amortized Cost	$ 116,000
Impairment on securities	94,000
Proceeds from sales of investment securities	0
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	48,421,000				51,898,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	50,650,000				53,692,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				100,000
12 months or longer	0				0
Fair value	0				100,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0				(1,000)
12 months or longer	0				0
Unrealized loss	0				(1,000)
Other Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	12,500,000				10,000,000
Gross unrealized gains	0				0
Gross unrealized losses	(1,541,000)				(1,120,000)
Fair Value	10,959,000				8,880,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	12,500,000				10,000,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	10,959,000				8,880,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	2,467,000				0
12 months or longer	8,492,000				8,880,000
Fair value	10,959,000				8,880,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(33,000)				0
12 months or longer	(1,508,000)				(1,120,000)
Unrealized loss	(1,541,000)				(1,120,000)
Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	60,921,000				61,898,000
Gross unrealized gains	2,229,000				1,795,000
Gross unrealized losses	(1,541,000)				(1,121,000)
Fair Value	$ 61,609,000				62,572,000
Number of securities that were in unrealized loss position twelve months or longer | Security	1
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	$ 60,921,000				61,898,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	61,609,000				$ 62,572,000
Back-to-Back Swaps [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Securities pledged as collateral	$ 6,900,000