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Commitments, Contingencies and Off-Balance-Sheet Risk (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk | The contractual amount of financial instruments with off-balance-sheet risk was as follows at year-end.
|  | 2017 |  |  | 2016 |
|  | Fixed Rate |  |  | Variable Rate |  |  | Fixed Rate |  |  | Variable Rate |
Commitments to extend credit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit and construction loans |  | $ | 4,982 |  |  | $ | 286,925 |  |  | $ | 6,905 |  |  | $ | 202,923 |
Overdraft protection |  |  | 7 |  |  |  | 33,353 |  |  |  | 5 |  |  |  | 29,075 |
Letters of credit |  |  | 624 |  |  |  | 2,637 |  |  |  | 600 |  |  |  | 349 |
|  | $ | 5,613 |  |  | $ | 322,915 |  |  | $ | 7,510 |  |  | $ | 232,347 |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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