Loans and Allowance for Loan Losses (Details 5) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Interest recognized on impaired loans [Member]
Loans, Impaired	$ 3,000	$ 0
Interest recognized on impaired loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	3,000	0
Interest recognized on impaired loans [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0	0
Interest recognized on impaired loans [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	3,000	0
Interest recognized on impaired loans [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	0	0
Interest recognized on impaired loans [Member] | Commercial Real Estate [Member]
Loans, Impaired	0	0
Interest recognized on impaired loans [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	0	0
Interest recognized on impaired loans [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	0	0
Interest recognized on impaired loans [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	0	0
Unpaid Contractual Principal Balance [Member]
Loans, Impaired	1,430,000		$ 1,437,000
Unpaid Contractual Principal Balance [Member] | Commercial And Industrials [Member]
Loans, Impaired	288,000		289,000
Unpaid Contractual Principal Balance [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Unpaid Contractual Principal Balance [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	212,000		213,000
Unpaid Contractual Principal Balance [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	76,000		76,000
Unpaid Contractual Principal Balance [Member] | Commercial Real Estate [Member]
Loans, Impaired	1,142,000		1,148,000
Unpaid Contractual Principal Balance [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	933,000		898,000
Unpaid Contractual Principal Balance [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	69,000		71,000
Unpaid Contractual Principal Balance [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	179,000		179,000
Recorded Investment With No Allowance [Member]
Loans, Impaired	1,142,000		810,000
Recorded Investment With No Allowance [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Recorded Investment With No Allowance [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Recorded Investment With No Allowance [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Recorded Investment With No Allowance [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Loans, Impaired	1,142,000		810,000
Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	894,000		739,000
Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	69,000		71,000
Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	179,000		0
Recorded Investment With Allowance [Member]
Loans, Impaired	288,000		627,000
Recorded Investment With Allowance [Member] | Commercial And Industrials [Member]
Loans, Impaired	288,000		289,000
Recorded Investment With Allowance [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Recorded Investment With Allowance [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	212,000		213,000
Recorded Investment With Allowance [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	76,000		76,000
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member]
Loans, Impaired	0		338,000
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	0		159,000
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	0		0
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	0		179,000
Total Recorded Investment [Member]
Loans, Impaired	1,430,000		1,437,000
Total Recorded Investment [Member] | Commercial And Industrials [Member]
Loans, Impaired	288,000		289,000
Total Recorded Investment [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Total Recorded Investment [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	212,000		213,000
Total Recorded Investment [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	76,000		76,000
Total Recorded Investment [Member] | Commercial Real Estate [Member]
Loans, Impaired	1,142,000		1,148,000
Total Recorded Investment [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	894,000		898,000
Total Recorded Investment [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	69,000		71,000
Total Recorded Investment [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	179,000		179,000
Related Allowance [Member]
Loans, Impaired	8,000		139,000
Related Allowance [Member] | Commercial And Industrials [Member]
Loans, Impaired	81,000		95,000
Related Allowance [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		0
Related Allowance [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	81,000		81,000
Related Allowance [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	0		14,000
Related Allowance [Member] | Commercial Real Estate [Member]
Loans, Impaired	0		44,000
Related Allowance [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	0		13,000
Related Allowance [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	0		0
Related Allowance [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	0		31,000
Average Recorded Investment [Member]
Loans, Impaired	1,322,000	1,305,000
Average Recorded Investment [Member] | Commercial And Industrials [Member]
Loans, Impaired	288,000	76,000
Average Recorded Investment [Member] | SBA Loans [Member] | Commercial And Industrials [Member]
Loans, Impaired	0	0	$ 0
Average Recorded Investment [Member] | Commercial [Member] | Commercial And Industrials [Member]
Loans, Impaired	212,000	0
Average Recorded Investment [Member] | Asset Based [Member] | Commercial And Industrials [Member]
Loans, Impaired	76,000	76,000
Average Recorded Investment [Member] | Commercial Real Estate [Member]
Loans, Impaired	1,034,000	1,229,000
Average Recorded Investment [Member] | Commercial Real Estate [Member] | Commercial Mortgages [Member]
Loans, Impaired	786,000	965,000
Average Recorded Investment [Member] | Commercial Real Estate [Member] | SBA Loans [Member]
Loans, Impaired	69,000	79,000
Average Recorded Investment [Member] | Commercial Real Estate [Member] | Religious Organizations [Member]
Loans, Impaired	$ 179,000	$ 185,000