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Off-Balance Sheet Loan Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Summary of Financial Instruments with Off-Balance Sheet Risk | The contractual amounts of financial instruments with off-balance sheet risk were as follows:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | Fixed |  |  | Variable |  |  | Fixed |  |  | Variable |
(Dollars in thousands) |  | Rate |  |  | Rate |  |  | Rate |  |  | Rate |
Commitments to make loans |  | $ | — |  |  | $ | — |  |  | $ | 7,345 |  |  | $ | 7,580 |
Unused lines of credit |  | $ | 133,634 |  |  | $ | 242,236 |  |  | $ | 109,611 |  |  | $ | 145,475 |
Standby letters of credit |  | $ | 1,998 |  |  | $ | 8,169 |  |  | $ | 2,547 |  |  | $ | 4,706 |
Mortgage warehouse commitments |  | $ | 9,411 |  |  | $ | 230,221 |  |  | $ | 14,387 |  |  | $ | 219,560 |

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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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