Loans - Summary of Performing and Non Performing Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	$ 37,159	$ 8,056
Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	9,126,796	7,241,074
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,121,251	1,589,419
Non-Covered Loans | Commercial - investor owned | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,584
Non-Covered Loans | Commercial - investor owned | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		0
Non-Covered Loans | Commercial - investor owned | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,584
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,058,460	1,498,408
Non-Covered Loans | CRE - owner occupied | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		24,727
Non-Covered Loans | CRE - owner occupied | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		0
Non-Covered Loans | CRE - owner occupied | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		24,727
Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	747,759	546,686
Non-Covered Loans | Construction and land development | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,820
Non-Covered Loans | Construction and land development | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		0
Non-Covered Loans | Construction and land development | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,820
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	37,143	8,035
Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	16	21
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	6,400	2,502
Loans, before unearned loan fees	3,372,771	3,086,494
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	3,154,118	2,876,755
Commercial and industrial | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	172,118	157,556
Commercial and industrial | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	46,535	52,183
Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	6,395	2,502
Commercial and industrial | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	5	0
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	204	921
Loans, before unearned loan fees	542,486	318,258
Residential Portfolio Segment | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	514,888	307,996
Residential Portfolio Segment | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	23,526	4,491
Residential Portfolio Segment | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	4,072	5,771
Residential Portfolio Segment | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	204	921
Residential Portfolio Segment | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	0	0
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	424	4,633
Loans, before unearned loan fees	266,828	177,614
Other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	264,287	174,888
Other | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,495	2,647
Other | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	46	79
Other | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	413	4,612
Other | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	$ 11	$ 21