Loans - Schedule of Deterioration of Credit Quality Contractual Purchased Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Notes Receivable Net Acquired With Deteriorated Credit Quality	$ 1,931	$ 2,331
Recorded Investment, allowance	0
One To Four Family Residential Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	998	1,012
Multi-Family Residential Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	292	296
Commercial Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	627	846
Commercial [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	14	177
Loan Purchase [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	2,104	2,471
Notes Receivable Net Acquired With Recorded Investment Net Of Allowance	1,917	2,331
Loan Purchase [Member] | One To Four Family Residential Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	1,019	1,045
Loan Purchase [Member] | Multi-Family Residential Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	293	300
Loan Purchase [Member] | Commercial Real Estate [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	727	899
Loan Purchase [Member] | Commercial [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	65	227
Loan Purchase [Member] | Consumer [Member]
Notes Receivable Net Acquired With Deteriorated Credit Quality	$ 0	$ 0