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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
Schedule of fair falue for off-balance sheet risks | The following table presents the commitments to extend credit and unfunded commitments as of March 31, 2018 and December 31, 2017:
(Dollars in thousands) | March 31, 2018 |  | December 31, 2017
Unused commitments to extend credit | $ | 9,994,802 |  |  | $ | 9,629,365 |
Standby letters of credit | 81,059 |  |  | 81,530 |
Unfunded commitments for investments in affordable housing projects | 63,803 |  |  | 61,819 |

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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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