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Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 22,424,501 | $ 19,787,876
Nonaccrual loans | 73,836 | 61,605
Financing Receivable, Nonaccrual, No Allowance | 36,537 |
Currently performing impaired loans | 51,700 | 35,800
Financing Receivable, Past Due | 65,045 | 62,338
Reinsurance Recoverable, Not Past Due | 22,359,456 | 19,725,538
Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 31,881 | 28,745
Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 15,721 | 12,333
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 17,443 | 21,260
Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans |  | 7,709,218
Commercial Real Estate Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,802,227 | 2,669,766
Nonaccrual loans | 10,231 | 11,654
Financing Receivable, Nonaccrual, No Allowance | 5,985 |
Financing Receivable, Past Due | 5,466 | 6,958
Reinsurance Recoverable, Not Past Due | 2,796,761 | 2,662,808
Commercial Real Estate Owner Occupied | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 934 | 2,307
Commercial Real Estate Owner Occupied | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 2,672 | 2,932
Commercial Real Estate Owner Occupied | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 1,860 | 1,719
Commercial real estate non owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,203,384 | 5,039,452
Nonaccrual loans | 5,219 | 7,173
Financing Receivable, Nonaccrual, No Allowance | 1,522 |
Financing Receivable, Past Due | 10,807 | 10,613
Reinsurance Recoverable, Not Past Due | 5,192,577 | 5,028,839
Commercial real estate non owner occupied | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 726 | 3,156
Commercial real estate non owner occupied | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 6,220 | 3,641
Commercial real estate non owner occupied | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 3,861 | 3,816
Consumer Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 3,099,172 | 3,068,625
Financing Receivable, Past Due | 15,461 | 21,107
Reinsurance Recoverable, Not Past Due | 3,083,711 | 3,047,518
Consumer Real Estate | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 8,859 | 11,646
Consumer Real Estate | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 328 | 2,157
Consumer Real Estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 6,274 | 7,304
Construction and Land Development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,901,746 | 2,430,483
Nonaccrual loans | 1,953 | 2,278
Financing Receivable, Nonaccrual, No Allowance | 0 |
Financing Receivable, Past Due | 1,432 | 3,590
Reinsurance Recoverable, Not Past Due | 2,900,314 | 2,426,893
Construction and Land Development | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 278 | 1,392
Construction and Land Development | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 418 | 711
Construction and Land Development | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 736 | 1,487
Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,038,457 | 6,290,296
Financing Receivable, Past Due | 30,487 | 17,316
Reinsurance Recoverable, Not Past Due | 8,007,970 | 6,272,980
Commercial and Industrial | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 20,278 | 8,474
Commercial and Industrial | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 5,801 | 2,478
Commercial and Industrial | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 4,408 | 6,364
Consumer and Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 379,515 | 289,254
Nonaccrual loans | 4 | 148
Financing Receivable, Nonaccrual, No Allowance | 0 |
Financing Receivable, Past Due | 1,392 | 2,754
Reinsurance Recoverable, Not Past Due | 378,123 | 286,500
Consumer and Other | Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 806 | 1,770
Consumer and Other | Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | 282 | 414
Consumer and Other | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Past Due | $ 304 | $ 570

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