Investment Securities (Held-to-maturity Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 0
Debt securities, maturing 1 to 5 years, amortized cost	737
Debt securities, maturing 5 to 10 years, amortized cost	11,042
Debt securities, maturing over 10 years, amortized cost	26,011
Amortized Cost	37,790	$ 40,928
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	724
Debt securities, maturing 5 to 10 years, fair value	11,438
Debt securities, maturing over 10 years, fair value	24,933
Fair Value	$ 37,095	41,213
Held-to-maturity securities, maturing within 1 year, average yield	0.00%
Held-to-maturity securities, maturing 1 to 5 years, average yield	2.97%
Held-to-maturity securities, maturing 6 to 10 years, average yield	3.08%
Held-to-maturity securities, maturing over 10 years, average yield	2.70%
Held-to-maturity securities, total average yield	2.82%
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 0
Debt securities, maturing 1 to 5 years, amortized cost	309
Debt securities, maturing 5 to 10 years, amortized cost	2,982
Debt securities, maturing over 10 years, amortized cost	1,160
Amortized Cost	4,451
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	309
Debt securities, maturing 5 to 10 years, fair value	3,410
Debt securities, maturing over 10 years, fair value	1,170
Fair Value	4,889	4,417
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	428
Debt securities, maturing 5 to 10 years, amortized cost	8,060
Debt securities, maturing over 10 years, amortized cost	21,277
Amortized Cost	29,765
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	415
Debt securities, maturing 5 to 10 years, fair value	8,028
Debt securities, maturing over 10 years, fair value	20,275
Fair Value	28,718	32,227
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	0
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	3,574
Amortized Cost	3,574	4,631
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	0
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	3,488
Fair Value	$ 3,488	$ 4,569

Held-to-maturity Securities, Debt Maturities, Average Yield

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- Definition

Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Average Yield

+ References

No definition available.

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- Definition

Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Average Yield

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- Definition

Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing after tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section II
-Paragraph B

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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