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Commitments and Contingent Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of financial instruments with off-balance sheet risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(dollars in thousands) |  | 2019 |  | 2018
Financial instruments whose contract amounts represent credit risk: | ​ | ​ | ​ | ​ | ​ | ​
Commitments to extend credit | ​ | $ | 5,791,088 | ​ | $ | 5,549,591
Standby letters of credit | ​ | ​ | 185,872 | ​ | ​ | 204,324
Commercial letters of credit | ​ | ​ | 6,994 | ​ | ​ | 7,535

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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