Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Contractual Maturities, Available-for-sale, Amortized Cost
Amortized Cost	$ 50,472	$ 50,942
Contractual Maturities, Available-for-sale, Fair Value
Fair Value	50,440	50,428
Contractual Maturities, Held-to-maturity, Amortized Cost
Amortized Cost	12,712	12,741
Contractual Maturities, Held-to-maturity, Fair Value
Fair Value	12,814	12,655
State and municipal securities
Contractual Maturities, Available-for-sale, Amortized Cost
Due in one year or less	900	906
Due after one year through five years	1,725	1,236
Due after five years through ten years	5,891	6,411
Due after ten years	2,532	2,543
Amortized Cost	11,048	11,096
Contractual Maturities, Available-for-sale, Fair Value
Due in one year or less	899	902
Due after one year through five years	1,720	1,226
Due after five years through ten year	5,933	6,290
Due after ten years	2,573	2,501
Fair Value	11,125	10,919
Contractual Maturities, Held-to-maturity, Amortized Cost
Due in one year or less	1,994	1,991
Due after one year through five years	3,748	3,154
Due after five years through ten years	6,970	7,596
Amortized Cost	10,718	10,750
Contractual Maturities, Held-to-maturity, Fair Value
Due in one year or less	1,987	1,978
Due after one year through five years	3,774	3,148
Due after five years through ten years	7,053	7,529
Fair Value	10,827	10,677
Mortgage-related securities
Contractual Maturities, Available-for-sale, Amortized Cost
Amortized Cost	38,424	38,846
Contractual Maturities, Available-for-sale, Fair Value
Fair Value	38,323	38,530
Investments in mutual funds and other equity securities
Contractual Maturities, Available-for-sale, Amortized Cost
Amortized Cost	1,000	1,000
Contractual Maturities, Available-for-sale, Fair Value
Fair Value	$ 992	$ 979