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Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Loan commitments to extend credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance-sheet instruments | $ 1,031,638 | $ 1,030,334
Standby letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance-sheet instruments | $ 31,421 | 29,961
Standby letters of credit | Minimum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Letter of credit term | 6 months |
Standby letters of credit | Maximum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Letter of credit term | 1 year |
Commercial and similar letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance-sheet instruments | $ 756 | $ 1,837
Commercial and similar letters of credit | Minimum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Letter of credit term | 3 months |
Commercial and similar letters of credit | Maximum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Letter of credit term | 6 months |

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- Definition The fair value of financial liabilities, 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 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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