Portfolio Loans - Credit Quality Based on Aging Status (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 9,017,642	$ 7,224,935
Financing Receivable, after Allowance for Credit Loss	55,995	8,056
Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,026,780	7,241,074
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,141,143	1,589,419
Non-Covered Loans | Commercial - investor owned | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	1
Non-Covered Loans | Commercial - investor owned | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	0
Non-Covered Loans | Commercial - investor owned | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	1
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,035,785	1,498,408
Non-Covered Loans | Commercial - owner occupied | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	23,405
Non-Covered Loans | Commercial - owner occupied | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	0
Non-Covered Loans | Commercial - owner occupied | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	23,405
Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	734,073	546,686
Non-Covered Loans | Construction and land development | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,690
Non-Covered Loans | Construction and land development | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	0
Non-Covered Loans | Construction and land development | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,690
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,366,208	3,086,494
Financing Receivable, after Allowance for Credit Loss	26,167	2,502
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,174,029	2,876,755
Commercial and industrial | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	152,619	157,556
Commercial and industrial | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	39,560	52,183
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	453,785	318,258
Financing Receivable, after Allowance for Credit Loss	267	921
Residential | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	444,774	307,996
Residential | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,838	4,491
Residential | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,173	5,771
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	256,749	177,614
Financing Receivable, after Allowance for Credit Loss	3,465	4,633
Other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	254,266	174,888
Other | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,445	2,647
Other | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	38	79
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	55,982	8,035
Performing | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	26,166	2,502
Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	267	921
Performing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	3,453	4,612
Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	13	21
Non Performing | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	1	0
Non Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	0	0
Non Performing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 12	$ 21