Investment Securities (Held-to-maturity Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
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	764
Debt securities, maturing 5 to 10 years, amortized cost	9,359
Debt securities, maturing over 10 years, amortized cost	32,040
Amortized Cost	42,163	$ 43,144
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	772
Debt securities, maturing 5 to 10 years, fair value	10,106
Debt securities, maturing over 10 years, fair value	31,930
Fair Value	$ 42,808	43,227
Held-to-maturity securities, maturing within 1 year, average yield	0.00%
Held-to-maturity securities, maturing 1 to 5 years, average yield	4.18%
Held-to-maturity securities, maturing 6 to 10 years, average yield	3.10%
Held-to-maturity securities, maturing over 10 years, average yield	4.01%
Held-to-maturity securities, total average yield	3.81%
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	314
Debt securities, maturing 5 to 10 years, amortized cost	2,980
Debt securities, maturing over 10 years, amortized cost	518
Amortized Cost	3,812	3,820
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	320
Debt securities, maturing 5 to 10 years, fair value	3,598
Debt securities, maturing over 10 years, fair value	545
Fair Value	4,463	4,041
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	450
Debt securities, maturing 5 to 10 years, amortized cost	6,379
Debt securities, maturing over 10 years, amortized cost	26,819
Amortized Cost	33,648	33,858
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	452
Debt securities, maturing 5 to 10 years, fair value	6,508
Debt securities, maturing over 10 years, fair value	26,730
Fair Value	33,690	33,762
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	4,703
Amortized Cost	4,703	5,466
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	4,655
Fair Value	$ 4,655	$ 5,424

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

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- Definition

Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Average Yield

+ References

No definition available.

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- Definition

Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Average Yield

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No definition available.

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- Definition

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

+ References

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- Definition

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

+ References

No definition available.

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- Definition

Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

No definition available.

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Fair value of held-to-maturity debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Fair value of held-to-maturity debt securities maturing after the tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Fair value of held-to-maturity debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Fair value of held-to-maturity debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Amortized cost of held-to-maturity debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Amortized cost of held-to-maturity debt securities maturing after the tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amortized cost of held-to-maturity debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amortized cost of held-to-maturity debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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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.

+ References

No definition available.

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