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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
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Total $ 10,011,918 $ 9,737,138
Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Total 10,018,815 9,744,427
Loans, including unearned loan fees 10,011,918 9,737,138
Unearned loan fees, net (6,897) (7,289)
Financing Receivable, Covered, After Allowance For Credit Loss And Unearned Loan Fees, Net 10,018,815 9,744,427
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Total 4,032,189 3,859,964
Loans, including unearned loan fees 4,032,189 3,859,964
Non-Covered Loans | CRE - investor owned    
Financing Receivable, Past Due [Line Items]    
Total 2,418,079 2,357,820
Loans, including unearned loan fees 2,418,079 2,357,820
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Total 2,281,223 2,270,551
Loans, including unearned loan fees 2,281,223 2,270,551
Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Total 663,264 611,565
Loans, including unearned loan fees 663,264 611,565
Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Total 364,059 395,537
Loans, including unearned loan fees 364,059 395,537
Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Total 260,001 248,990
Loans, including unearned loan fees 260,001 248,990
Total Past Due | Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 18,159 15,373
Total Past Due | Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Total 5,138 2,928
Total Past Due | Non-Covered Loans | CRE - investor owned    
Financing Receivable, Past Due [Line Items]    
Total 3,184 1,135
Total Past Due | Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Total 6,864 8,792
Total Past Due | Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Total 396 1,201
Total Past Due | Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Total 2,414 1,227
Total Past Due | Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Total 163 90
30-89 Days Past Due | Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 11,071 10,437
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Total 3,244 555
30-89 Days Past Due | Non-Covered Loans | CRE - investor owned    
Financing Receivable, Past Due [Line Items]    
Total 2,086 0
30-89 Days Past Due | Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Total 2,780 8,628
30-89 Days Past Due | Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Total 396 9
30-89 Days Past Due | Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Total 2,414 1,227
30-89 Days Past Due | Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Total 151 18
90 or More Days Past Due | Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 7,088 4,936
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Total 1,894 2,373
90 or More Days Past Due | Non-Covered Loans | CRE - investor owned    
Financing Receivable, Past Due [Line Items]    
Total 1,098 1,135
90 or More Days Past Due | Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Total 4,084 164
90 or More Days Past Due | Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Total 0 1,192
90 or More Days Past Due | Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Total 0 0
90 or More Days Past Due | Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Total 12 72
Current | Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 10,000,656 9,729,054
Current | Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Total 4,027,051 3,857,036
Current | Non-Covered Loans | CRE - investor owned    
Financing Receivable, Past Due [Line Items]    
Total 2,414,895 2,356,685
Current | Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Total 2,274,359 2,261,759
Current | Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Total 662,868 610,364
Current | Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Total 361,645 394,310
Current | Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Total $ 259,838 $ 248,900