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Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 9,354,987 | $ 9,017,642
Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,361,916 | 9,026,780
Loans, including unearned loan fees | 9,354,987 | 9,017,642
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,710,012 | 3,396,590
Loans, including unearned loan fees | 3,709,893 | 3,392,375
Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,286,458 | 2,141,143
Loans, including unearned loan fees | 2,286,458 | 2,141,143
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,152,189 | 2,035,785
Loans, including unearned loan fees | 2,152,189 | 2,035,785
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 583,649 | 734,073
Loans, including unearned loan fees | 583,649 | 734,073
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 397,450 | 454,052
Loans, including unearned loan fees | 397,450 | 454,052
Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 232,158 | 265,137
Loans, including unearned loan fees | 225,348 | 260,214
Total Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 24,765 | 57,402
Total Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11,835 | 38,605
Total Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,059 | 3,880
Total Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,428 | 10,359
Total Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,192 | 24
Total Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 192 | 4,486
Total Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 59 | 48
30-89 Days Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 17,694 | 41,639
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,966 | 24,447
30-89 Days Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,059 | 3,880
30-89 Days Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,241 | 10,070
30-89 Days Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,192 | 24
30-89 Days Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 192 | 3,181
30-89 Days Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 44 | 37
90 or More Days Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,071 | 15,763
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,869 | 14,158
90 or More Days Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 or More Days Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 187 | 289
90 or More Days Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 or More Days Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 1,305
90 or More Days Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 15 | 11
Current | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,330,222 | 8,960,240
Current | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,698,058 | 3,353,770
Current | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,284,399 | 2,137,263
Current | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,142,761 | 2,025,426
Current | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 582,457 | 734,049
Current | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 397,258 | 449,566
Current | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 225,289 | $ 260,166

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