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Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Goodwill and Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |
Total goodwill |  |  | $ 823,172 |  |  |  |  |
CDI current period amortization | $ (2,219) | $ (1,852) | (4,507) | $ (3,776) |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 919 | 919 | 919 | 919 |  |  |  |
Other intangible assets, net | 30,140 | 22,958 | 30,140 | 22,958 |  | $ 34,647 |  |
Total goodwill and intangible assets, end of period | 853,312 | 788,800 | 853,312 | 788,800 |  |  |  |
Core Deposits [Member] |  |  |  |  |  |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |
Gross core deposit intangible balance, beginning of period |  |  |  |  | $ 88,931 | 88,931 | $ 105,473 | $ 105,473
Accumulated amortization at beginning of period |  |  |  |  | $ (57,491) | $ (55,203) | $ (81,582) | $ (79,658)
Core deposit intangible, net, beginning of period | 31,440 | 23,891 | 33,728 | 25,815 |  |  |  |
CDI current period amortization | (2,219) | (1,852) | (4,507) | (3,776) |  |  |  |
Total core deposit intangible, end of period | $ 29,221 | $ 22,039 | $ 29,221 | $ 22,039 |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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