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Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 9,737,138 $ 9,017,642
Non-Covered Loans    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 9,744,427 9,026,780
Financing Receivable, Covered, after Allowance for Credit Loss 9,737,138 9,017,642
Financing Receivable, Covered, After Allowance For Credit Loss And Unearned Loan Fees, Net 9,744,427 9,026,780
Financing Receivable, Unearned Loan Fees, Net (7,289) (9,138)
Non-Covered Loans | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 10,437 41,639
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 10,437 41,639
Financing Receivable, Unearned Loan Fees, Net 0 0
Non-Covered Loans | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4,936 15,763
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 4,936 15,763
Financing Receivable, Unearned Loan Fees, Net 0 0
Non-Covered Loans | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 15,373 57,402
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 15,373 57,402
Financing Receivable, Unearned Loan Fees, Net 0 0
Non-Covered Loans | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 9,721,765 8,960,240
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process 9,729,054 8,969,378
Financing Receivable, Unearned Loan Fees, Net (7,289) (9,138)
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,859,964 3,396,590
Financing Receivable, Covered, after Allowance for Credit Loss 3,859,964 3,396,590
Non-Covered Loans | Commercial and industrial | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 555 24,447
Non-Covered Loans | Commercial and industrial | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,373 14,158
Non-Covered Loans | Commercial and industrial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,928 38,605
Non-Covered Loans | Commercial and industrial | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,857,036 3,357,985
Non-Covered Loans | Commercial - investor owned    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,357,820 2,141,143
Financing Receivable, Covered, after Allowance for Credit Loss 2,357,820 2,141,143
Non-Covered Loans | Commercial - investor owned | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 3,880
Non-Covered Loans | Commercial - investor owned | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,135 0
Non-Covered Loans | Commercial - investor owned | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,135 3,880
Non-Covered Loans | Commercial - investor owned | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,356,685 2,137,263
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,270,551 2,035,785
Financing Receivable, Covered, after Allowance for Credit Loss 2,270,551 2,035,785
Non-Covered Loans | CRE - owner occupied | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 8,628 10,070
Non-Covered Loans | CRE - owner occupied | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 164 289
Non-Covered Loans | CRE - owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 8,792 10,359
Non-Covered Loans | CRE - owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,261,759 2,025,426
Non-Covered Loans | Construction and land development    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 611,565 734,073
Financing Receivable, Covered, after Allowance for Credit Loss 611,565 734,073
Non-Covered Loans | Construction and land development | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 9 24
Non-Covered Loans | Construction and land development | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,192 0
Non-Covered Loans | Construction and land development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,201 24
Non-Covered Loans | Construction and land development | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 610,364 734,049
Non-Covered Loans | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 395,537 454,052
Financing Receivable, Covered, after Allowance for Credit Loss 395,537 454,052
Non-Covered Loans | Residential real estate | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,227 3,181
Non-Covered Loans | Residential real estate | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 1,305
Non-Covered Loans | Residential real estate | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,227 4,486
Non-Covered Loans | Residential real estate | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 394,310 449,566
Non-Covered Loans | Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 248,990 265,137
Financing Receivable, Covered, after Allowance for Credit Loss 248,990 265,137
Non-Covered Loans | Other | Financial Asset, 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 18 37
Non-Covered Loans | Other | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 72 11
Non-Covered Loans | Other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 90 48
Non-Covered Loans | Other | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 248,900 $ 265,089