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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit premiums, beginning of period | $ 127,340 |  |  |
Amortization of intangibles | (3,413) | $ (2,641) |  |
Total | 121,673 |  | $ 127,340 |
Core deposit premiums, end of period | 121,673 |  | 127,340 |
Core deposit intangible |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit premiums, beginning of period | 111,808 | 79,807 | 79,807 |
Acquisition of intangible asset | 0 |  | 42,695 |
Disposition of intangible asset | (1,841) |  | 0 |
Amortization of intangibles | (3,070) |  | (10,694) |
Total | 106,897 | 79,807 | 79,807 |
Core deposit premiums, end of period | 106,897 |  | 111,808 |
Books of Business Intangible |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit premiums, beginning of period | 15,532 | 11,527 | 11,527 |
Acquisition of intangible asset | 0 |  | 5,116 |
Disposition of intangible asset | (413) |  | 0 |
Amortization of intangibles | (343) |  | (1,111) |
Total | 14,776 | $ 11,527 | 15,532 |
Core deposit premiums, end of period | 14,776 |  | 15,532 |
Landrum Company | Core deposit intangible |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit premiums, beginning of period | 24,300 |  |  |
Total | 24,300 |  | 24,300 |
Core deposit premiums, end of period |  |  | 24,300 |
Reliance Bancshares, Inc. | Core deposit intangible |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Total |  |  |  | $ 18,400
Wealth Management Operations | Landrum Company | Core deposit intangible |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit premiums, beginning of period | 5,100 |  |  |
Total | $ 5,100 |  | 5,100 |
Core deposit premiums, end of period |  |  | $ 5,100 |

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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 http://asc.fasb.org/extlink&oid=118932676&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 http://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 http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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