Investment Securities (Held-to-maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	$ 35,606	$ 36,961
Gross Unrealized Gains	904	684
Gross Unrealized Losses	(444)	(682)
Held-to-maturity investment securities at fair value	36,066	36,963
Amortized Cost	35,606	36,961
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	564	493
Gross Unrealized Losses	0	0
Held-to-maturity investment securities at fair value	4,965	4,896
Amortized Cost	4,401
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	340	191
Gross Unrealized Losses	(412)	(632)
Held-to-maturity investment securities at fair value	28,276	28,603
Amortized Cost	28,348
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(32)	(50)
Held-to-maturity investment securities at fair value	2,825	3,464
Amortized Cost	2,857
Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	35,606	36,961
Reported Value Measurement [Member] \| States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	4,401	4,403
Reported Value Measurement [Member] \| Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	28,348	29,044
Reported Value Measurement [Member] \| Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	$ 2,857	$ 3,514

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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