Loans - Credit Quality Based on Aging Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	$ 77,569	$ 78,789
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	10,884,118	9,737,138
Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	10,884,118	9,737,138
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	10,888,345	9,744,427
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,452,402	2,357,820
Non-Covered Loans | Commercial - investor owned | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	17,885	18,595
Non-Covered Loans | Commercial - investor owned | Special Mention (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Non-Covered Loans | Commercial - investor owned | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	17,885	18,595
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,344,117	2,270,551
Non-Covered Loans | Commercial - owner occupied | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	28,373	29,397
Non-Covered Loans | Commercial - owner occupied | Special Mention (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Non-Covered Loans | Commercial - owner occupied | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	28,373	29,397
Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	760,122	611,565
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	26,188	23,310
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4,646,371	3,836,572
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4,475,490	3,645,384
Commercial and industrial | Special Mention (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	89,066	147,206
Commercial and industrial | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	81,815	43,982
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	712	743
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	371,476	394,794
Residential | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	358,299	390,903
Residential | Special Mention (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,812	1,543
Residential | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	10,365	2,348
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	4,411	6,744
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	270,964	235,039
Other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	244,839	235,014
Other | Special Mention (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	26,117	0
Other | Classified (8-9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	8	25
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	77,452	78,647
Performing | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	26,076	23,240
Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	712	743
Performing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	4,406	6,672
Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	117	142
Non Performing | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	112	70
Non Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	0	0
Non Performing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss	$ 5	$ 72