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Share-based Compensation and Other Employment Benefit Plans (Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Unrecognized compensation cost | $ 26,100 |  |
Restricted Share Units |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Unrecognized compensation cost | 22,100 |  |
Market Restricted Share Units |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Unrecognized compensation cost | 1,400 |  |
Performance Share Units |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Unrecognized compensation cost | 2,600 |  |
Labor and Related Expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total share-based compensation expense included in non-interest expense | 17,827 | $ 19,618 | $ 15,712
Merger-Related Expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total share-based compensation expense included in non-interest expense | 0 | 4,219 | 0
Other Operating Income (Expense) |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total share-based compensation expense included in non-interest expense | 814 | 650 | 931
Non-interest expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total share-based compensation expense included in non-interest expense | $ 18,641 | $ 24,487 | $ 16,643

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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