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v3.19.3

Business Combinations (Narrative) (Details) shares in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 20, 2019 shares | Sep. 30, 2019 USD ($) loan | Sep. 30, 2019 USD ($) loan shares | Dec. 31, 2018 USD ($) | Jul. 13, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 861,291,000 | $ 861,291,000 | $ 790,972,000 |  | $ 745,523,000
Purchased credit impaired loans book balance |  | 269,204,000 | 269,204,000 | 308,401,000 |  |
Recorded investment without an allowance |  | 47,178,000 | 47,178,000 | $ 107,528,000 |  |
Sale of available-for-sale securities |  |  | 143,300,000 |  |  |
MidSouth [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired |  | 124,642,000 | 124,642,000 |  |  |
Goodwill |  | 69,207,000 | $ 69,207,000 |  |  |
Shares issued | shares | 5.0 |  | 5.0 |  |  |
Fixed conversion ratio |  |  | 0.2952 |  |  |
Business combination transaction value on an average of share price |  |  | $ 193,800,000 |  |  |
Book balance of the loans acquired |  | 686,000,000.0 | 686,000,000.0 |  |  |
Estimated uncollectible amount |  | 17,200,000 | 17,200,000 |  |  |
Estimated fair value of uncollectible amount |  | 667,200,000 | 667,200,000 |  |  |
Purchased credit impaired loans book balance |  | 140,300,000 | 140,300,000 |  |  |
Recorded investment without an allowance |  | 118,000,000.0 | 118,000,000.0 |  |  |
Sale of available-for-sale securities |  |  | 143,300,000 |  |  |
Identifiable intangible assets |  | 35,000,000 | $ 35,000,000 |  |  |
Estimated useful life |  |  | 15 years |  |  |
Customer repurchase agreements |  | 39,500,000 | $ 39,500,000 |  |  |
Number of preferred debentures |  |  | 3 |  |  |
Debt instrument maturity year |  |  | 2037 |  |  |
Acquisition related costs |  | 28,800,000 | $ 28,810,000 |  |  |
Assets under management |  | $ 785,204,000 | $ 785,204,000 |  |  |
MidSouth [Member] | FHLB |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of FHLB advances | loan |  | 2 | 2 |  |  |
FHLB advances amount |  | $ 27,500 | $ 27,500 |  |  |
FHLB advances maturity period |  |  | 30 days |  |  |
FHLB advances fixed interest rate |  | 2.16% | 2.16% |  |  |
Capital One [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired |  | $ (187,218,000) | $ (187,218,000) |  |  |
Goodwill |  | 46,561,000 | 46,561,000 |  |  |
Identifiable intangible assets |  | 27,562,000 | $ 27,562,000 |  |  |
Assets under management |  |  |  |  | $ 4,000,000,000 |
Assets under management and administration |  |  |  |  | 10,400,000,000 |
Cash for customer deposit liabilities assumed |  |  |  |  | $ 217,000,000 |
Trust And Asset Management Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 17 years |  |  |
Acquisition related costs |  |  | $ 5,700,000 |  |  |
Trust fee revenue |  |  | 14,800,000 |  |  |
Related expense |  | $ 14,000,000.0 | $ 14,000,000.0 |  |  |

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