Investment Securities, Maturities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Available-for-Sale, Amortized Cost
Due within one year	$ 15,455,000
Due from one to five years	98,030,000
Due from five to ten years	49,458,000
Due after ten years	1,717,000
Amortized Cost Basis	164,660,000
Amortized Cost	220,378,000	$ 244,283,000
Available-for-Sale, Fair Value
Due within one year	15,425,000
Due from one to five years	97,128,000
Due from five to ten years	48,863,000
Due after ten years	1,686,000
Total available-for-sale, maturities	163,102,000
Fair Value	217,668,000	238,421,000
Held-to-Maturity, Amortized Cost
Due within one year	2,800,000
Due from one to five years	6,274,000
Due from five to ten years	7,982,000
Due after ten years	15,307,000
Amortized Cost	32,363,000	29,721,000
Held-to-Maturity, Fair Value
Due within one year	2,799,000
Due from one to five years	6,270,000
Due from five to ten years	7,946,000
Due after ten years	15,212,000
Held-to-maturity, fair value	32,227,000	29,024,000
Available-for-sale securities pledged as collateral	168,251,000	106,568,000
U.S. Agency mortgage-backed securities [Member]
Available-for-Sale, Amortized Cost
Amortized Cost	55,718,000	57,584,000
Available-for-Sale, Fair Value
Fair Value	54,566,000	$ 55,610,000
Held-to-Maturity, Amortized Cost
Amortized Cost	0
Held-to-Maturity, Fair Value
Held-to-maturity, fair value	$ 0