Investment Securities (Held-to-maturity Securities by Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 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	751
Debt securities, maturing 5 to 10 years, amortized cost	9,317
Debt securities, maturing over 10 years, amortized cost	29,583
Amortized Cost	39,651	$ 40,928
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	742
Debt securities, maturing 5 to 10 years, fair value	9,774
Debt securities, maturing over 10 years, fair value	28,924
Fair Value	$ 39,440	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	3.16%
Held-to-maturity securities, maturing 6 to 10 years, average yield	2.79%
Held-to-maturity securities, maturing over 10 years, average yield	3.53%
Held-to-maturity securities, total average yield	3.35%
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	312
Debt securities, maturing 5 to 10 years, amortized cost	2,981
Debt securities, maturing over 10 years, amortized cost	514
Amortized Cost	3,807
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	312
Debt securities, maturing 5 to 10 years, fair value	3,459
Debt securities, maturing over 10 years, fair value	529
Fair Value	4,300	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	439
Debt securities, maturing 5 to 10 years, amortized cost	6,336
Debt securities, maturing over 10 years, amortized cost	24,815
Amortized Cost	31,590
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	430
Debt securities, maturing 5 to 10 years, fair value	6,315
Debt securities, maturing over 10 years, fair value	24,233
Fair Value	30,978	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	4,254
Amortized Cost	4,254
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	4,162
Fair Value	$ 4,162	$ 4,569

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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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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- Definition

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

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