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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] | The following table presents the commitments to extend credit and unfunded commitments as of December 31, 2019 and 2018:
(Dollars in thousands) | 2019 |  | 2018
Unused commitments to extend credit | $ | 10,682,378 |  |  | $ | 10,054,712 |
Standby letters of credit | 99,601 |  |  | 96,467 |

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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=109250915&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=109250915&loc=d3e13433-108611 + Details
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