Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available for sale Securities, Amortized Cost, Due in 1 year or less	$ 100,000
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years	12,072,000
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years	46,307,000
Available for sale Securities, Amortized Cost, Due after 10 years	10,771,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	69,250,000
Equity Securities, Amortized Cost	550,000
Available-for-sale securities, Amortized Cost	96,198,000	$ 138,048,000
Available for sale Securities, Fair Value, Due in 1 year or less	100,000
Available for sale Securities, Fair Value, Due after 1 year but within 5 years	11,825,000
Available for sale Securities, Fair Value, Due after 5 years but within 10 years	44,779,000
Available for sale Securities, Fair Value, Due after 10 years	10,424,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total	67,128,000
Equity Securities, Fair Value	506,000
Available for sale Securities, Fair Value	93,465,000	133,625,000
Held-to-maturity, Due in 1 year or less, Amortized Cost	2,001,000
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost	9,431,000
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost	35,941,000
Held-to-maturity, Due after 10 years, Amortized Cost	511,000
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	47,884,000
Held-to-maturity securities, Amortized Cost	101,356,000	0	$ 0
Held-to-maturity, Due in 1 year or less, Fair Value	1,989,000
Held-to-maturity, Due after 1 year through 5, Fair Value	9,357,000
Held-to-maturity, Due after 5 years through 10 years, Fair Value	35,679,000
Held-to-maturity, Due after 10 years, Fair Value	509,000
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	47,534,000
Held-to-maturity, Fair Value	100,483,000	$ 0
Mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Available for sale Securities without a Single Maturity Date, Amortized Cost	26,398,000
Available for sale securities without a Single Maturity Date, Fair Value	25,831,000
Held-to-maturity without Single Maturity Date, Amortized Cost	53,472,000
Held-to-maturity without Single Maturity Date, Fair Value	$ 52,949,000