Goodwill and Intangible Assets - Core Deposit Intangible (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Changes in the core deposit intangible
Balance at the beginning of the period			$ 1,069,000
Amortization	$ (76,000)	$ (126,000)	(151,000)	$ (168,000)
Balance at the end of the period	918,000		$ 918,000		$ 1,069,000
Core deposit intangible
Intangibles
Amortization period			7 years
Changes in the core deposit intangible
Balance at the beginning of the period			$ 1,069,000
Liberty Bell Bank acquisition					1,489,000
Amortization	(76,000)	$ (126,000)	(151,000)	$ (168,000)	(420,000)
Balance at the end of the period	918,000		918,000		$ 1,069,000
Remaining amortization
Remainder of 2019	151,000		151,000
2020	216,000		216,000
2021	155,000		155,000
2022	128,000		128,000
2023	128,000		128,000
Thereafter	$ 140,000		$ 140,000