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Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years	$ 19,586
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years	43,451
Available for sale Securities, Amortized Cost, Due after 10 years	12,109
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	75,146
Available-for-sale securities, Amortized Cost	116,823
Available for sale Securities, Fair Value, Due after 1 year but within 5 years	18,828
Available for sale Securities, Fair Value, Due after 5 years but within 10 years	40,271
Available for sale Securities, Fair Value, Due after 10 years	11,241
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total	70,340
Available for sale Securities, Fair Value	110,527	$ 92,959
Held-to-maturity, Due in 1 year or less, Amortized Cost	3,084
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost	15,466
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost	82,415
Held-to-maturity, Due after 10 years, Amortized Cost	1,212
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	102,177
Held-to-maturity debt securities, Amortized Cost	171,521	101,356
Held-to-maturity, Due in 1 year or less, Fair Value	3,080
Held-to-maturity, Due after 1 year through 5, Fair Value	15,163
Held-to-maturity, Due after 5 years through 10 years, Fair Value	80,337
Held-to-maturity, Due after 10 years, Fair Value	1,192
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	99,772
Held-to-maturity, Fair Value	167,120	$ 100,483
Mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Available for sale Securities without a Single Maturity Date, Amortized Cost	41,677
Available for sale securities without a Single Maturity Date, Fair Value	40,187
Held-to-maturity without Single Maturity Date, Amortized Cost	69,344
Held-to-maturity without Single Maturity Date, Fair Value	$ 67,348

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