Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Unrealized Gains on Equity Securities Still Held at Beginning of Year	$ 1,335	$ 1,001	$ 1,329	$ 3,670
Net market gains/(losses)	334	(328)	1,646
Less: Net gains for equity securities sold	0	0	3,987
Unrealized Gains on Equity Securities Still Held	$ 1,335	$ 1,001	$ 1,329	$ 3,670

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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