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Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Private mortgage-backed security fair value	$ 1,000	$ 500
Investment securities, pledged as collateral for public deposits	234,382	176,813
Sales of investment securities		140,621	$ 8
Net realized gains (losses) of investment securities		235	$ 3
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
IPO [Member] | Class B shares [Member]
Shares owned	12,356

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

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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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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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