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Securities (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Securities [Abstract]
Private mortgage-backed security fair value		$ 1,000
Investment securities, pledged as collateral for public deposits		225,467	$ 176,813
Sales of investment securities	$ 45,601
Net realized gains (losses) of investment securities	$ 235
Federal Home Loan Bank stock and Federal Reserve Bank stock, cost		37,468	31,338
Federal Home Loan Bank Stock, cost		20,036	19,647
Federal Reserve Bank, cost		$ 17,432	$ 11,691

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- Definition

Private mortgage-backed security fair value.

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- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 325
-Section 45
-Paragraph 1
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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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-SubTopic 325
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Amount of realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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