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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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- Definition Private mortgage-backed security fair value. + References No definition available. + Details
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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 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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