Mortgage Backed Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Mortgage Backed Securities
Fair Value	$ 96,181	$ 91,937
MBS
Mortgage Backed Securities
Weighted Average Interest Rate	4.50%	4.70%
Principal Balance	$ 123,863	$ 117,848
Amortized Cost	89,941	87,163
Fair Value	96,181	91,937
Gross Unrealized Gains	6,314	4,856
Gross Unrealized Losses	$ (74)	$ (82)
Mortgage Backed Securities Weighted Average Interest Rate
After five years through ten years (as percent)	10.70%	10.60%
After ten years (as percent)	4.30%	4.50%
Mortgage Backed Securities Principal Balance
After five years through ten years	$ 2,869	$ 3,406
After ten years	120,994	114,442
Mortgage Backed Securities Amortized Cost
After five years through ten years	2,634	3,103
After ten years	87,307	84,060
Mortgage Backed Securities Estimated Fair Value
After five years through ten years	2,847	3,520
After ten years	$ 93,334	$ 88,417
Freddie Mac Loans
Mortgage Backed Securities
Weighted Average Interest Rate	4.10%	4.50%
Principal Balance	$ 87,646	$ 97,066
Amortized Cost	64,362	70,819
Fair Value	69,481	75,591
Gross Unrealized Gains	$ 5,119	4,826
Gross Unrealized Losses		$ (54)
Commercial Loans
Mortgage Backed Securities
Weighted Average Interest Rate	5.30%	5.50%
Principal Balance	$ 36,113	$ 20,666
Amortized Cost	25,475	16,228
Fair Value	26,596	16,231
Gross Unrealized Gains	1,195	30
Gross Unrealized Losses	$ (73)	$ (27)
Tax Liens
Mortgage Backed Securities
Weighted Average Interest Rate	6.00%	6.00%
Principal Balance	$ 104	$ 116
Amortized Cost	104	116
Fair Value	104	115
Gross Unrealized Losses	$ (1)	$ (1)