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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Federal Reserve Bank Stock | $ 1,100,000 |
Federal Home Loan Bank Stock | 1,800,000 | $ 1,100,000
Loans Receivable Held-for-sale, Amount | 1,111,000 | 2,194,000
Trading securities | 0 | 0
Bank owned life insurance death benefits | 97,300,000 | 97,700,000
Borrowings against cash surrender value of bank owned life insurance | 0 | $ 0
Stock-based compensation related to stock options recognized in consolidated financial statements | $ 0 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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