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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