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Loans and Leases Held for Investment and Credit Quality - Summary of Total Loans and Leases Held for Investment and Aging Analysis of Portfolio Segments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases $ 8,934,903 $ 8,655,865
Retained Loan Discount and Net Deferred Costs (22,342) (22,018)
Total 8,912,561 8,633,847
Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 8,555,681 8,267,829
Receivables Not Under the Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 5,718,551 5,540,595
Receivables Not Under the Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,749,469 1,702,656
Receivables Not Under the Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,082,773 1,018,983
Receivables Not Under the Fair Value Option | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,888 5,595
Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 379,222 388,036
Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 151,510 127,965
Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 8,404,171 8,139,864
30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 37,441 41,231
90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 114,069 86,734
Guaranteed Balance    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 3,148,967 $ 3,033,694
Total Carried at Amortized Cost, Percentage 35.90% 35.90%
Loans Accounted for Under the Fair Value Option, Percentage 19.40% 17.10%
Total Loans and Leases, Percentage 35.20% 35.00%
Guaranteed Balance | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 3,075,403 $ 2,967,395
Guaranteed Balance | Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 73,564 $ 66,299
Guaranteed Balance | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Percentage 70.10% 70.60%
Guaranteed Balance | Total Past Due | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 106,177 $ 90,290
Guaranteed Balance | Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Percentage 35.30% 35.30%
Guaranteed Balance | Current or Less than 30 Days Past Due | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 2,969,226 $ 2,877,105
Guaranteed Balance | 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Percentage 66.40% 70.80%
Guaranteed Balance | 30-89 Days Past Due | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 24,868 $ 29,183
Guaranteed Balance | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Percentage 71.30% 70.50%
Guaranteed Balance | 90 Days or More Past Due | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total $ 81,309 $ 61,107
Commercial & Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,413,033 4,317,909
Commercial & Industrial | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,323,530 2,277,050
Commercial & Industrial | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,160,909 1,139,322
Commercial & Industrial | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 923,706 895,942
Commercial & Industrial | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,888 5,595
Commercial & Industrial | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,213,979 4,112,008
Commercial & Industrial | Receivables Not Under the Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,176,636 2,125,163
Commercial & Industrial | Receivables Not Under the Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,154,578 1,131,493
Commercial & Industrial | Receivables Not Under the Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 877,877 849,757
Commercial & Industrial | Receivables Not Under the Fair Value Option | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,888 5,595
Commercial & Industrial | Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 199,054 205,901
Commercial & Industrial | Receivables Under The Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 146,894 151,887
Commercial & Industrial | Receivables Under The Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 6,331 7,829
Commercial & Industrial | Receivables Under The Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 45,829 46,185
Commercial & Industrial | Receivables Under The Fair Value Option | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial & Industrial | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 80,469 56,786
Commercial & Industrial | Total Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 73,484 49,936
Commercial & Industrial | Total Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial & Industrial | Total Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 6,981 6,850
Commercial & Industrial | Total Past Due | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4 0
Commercial & Industrial | Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,133,510 4,055,222
Commercial & Industrial | Current or Less than 30 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,103,152 2,075,227
Commercial & Industrial | Current or Less than 30 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,154,578 1,131,493
Commercial & Industrial | Current or Less than 30 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 870,896 842,907
Commercial & Industrial | Current or Less than 30 Days Past Due | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4,884 5,595
Commercial & Industrial | 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 15,437 19,376
Commercial & Industrial | 30-89 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 15,173 16,570
Commercial & Industrial | 30-89 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial & Industrial | 30-89 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 264 2,806
Commercial & Industrial | 30-89 Days Past Due | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial & Industrial | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 65,032 37,410
Commercial & Industrial | 90 Days or More Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 58,311 33,366
Commercial & Industrial | 90 Days or More Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial & Industrial | 90 Days or More Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 6,717 4,044
Commercial & Industrial | 90 Days or More Past Due | Paycheck Protection Program    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 4 0
Construction & Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 475,215 470,054
Construction & Development | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 427,050 415,094
Construction & Development | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 40,624 47,419
Construction & Development | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 7,541 7,541
Construction & Development | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 475,215 470,054
Construction & Development | Receivables Not Under the Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 427,050 415,094
Construction & Development | Receivables Not Under the Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 40,624 47,419
Construction & Development | Receivables Not Under the Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 7,541 7,541
Construction & Development | Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Receivables Under The Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Receivables Under The Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Receivables Under The Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,503 1,745
Construction & Development | Total Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,503 1,745
Construction & Development | Total Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Total Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 472,712 468,309
Construction & Development | Current or Less than 30 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 424,547 413,349
Construction & Development | Current or Less than 30 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 40,624 47,419
Construction & Development | Current or Less than 30 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 7,541 7,541
Construction & Development | 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,061 1,745
Construction & Development | 30-89 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,061 1,745
Construction & Development | 30-89 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | 30-89 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,442 0
Construction & Development | 90 Days or More Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,442 0
Construction & Development | 90 Days or More Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Construction & Development | 90 Days or More Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 3,454,709 3,296,114
Commercial Real Estate | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,682,582 2,592,934
Commercial Real Estate | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 554,267 523,744
Commercial Real Estate | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 217,860 179,436
Commercial Real Estate | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 3,310,622 3,151,005
Commercial Real Estate | Receivables Not Under the Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,559,000 2,465,576
Commercial Real Estate | Receivables Not Under the Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 554,267 523,744
Commercial Real Estate | Receivables Not Under the Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 197,355 161,685
Commercial Real Estate | Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 144,087 145,109
Commercial Real Estate | Receivables Under The Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 123,582 127,358
Commercial Real Estate | Receivables Under The Fair Value Option | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial Real Estate | Receivables Under The Fair Value Option | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 20,505 17,751
Commercial Real Estate | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 66,651 66,003
Commercial Real Estate | Total Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 41,437 50,899
Commercial Real Estate | Total Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 12,032 12,032
Commercial Real Estate | Total Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 13,182 3,072
Commercial Real Estate | Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 3,243,971 3,085,002
Commercial Real Estate | Current or Less than 30 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 2,517,563 2,414,677
Commercial Real Estate | Current or Less than 30 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 542,235 511,712
Commercial Real Estate | Current or Less than 30 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 184,173 158,613
Commercial Real Estate | 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 20,943 18,589
Commercial Real Estate | 30-89 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 10,833 18,589
Commercial Real Estate | 30-89 Days Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 0
Commercial Real Estate | 30-89 Days Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 10,110 0
Commercial Real Estate | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 45,708 47,414
Commercial Real Estate | 90 Days or More Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 30,604 32,310
Commercial Real Estate | 90 Days or More Past Due | Specialty Lending    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 12,032 12,032
Commercial Real Estate | 90 Days or More Past Due | Energy & Infrastructure    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 3,072 3,072
Commercial Land    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 591,946 571,788
Commercial Land | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 591,946 571,788
Commercial Land | Receivables Not Under the Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 555,865 534,762
Commercial Land | Receivables Not Under the Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 555,865 534,762
Commercial Land | Receivables Under The Fair Value Option    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 36,081 37,026
Commercial Land | Receivables Under The Fair Value Option | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 36,081 37,026
Commercial Land | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,887 3,431
Commercial Land | Total Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,887 3,431
Commercial Land | Current or Less than 30 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 553,978 531,331
Commercial Land | Current or Less than 30 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 553,978 531,331
Commercial Land | 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 1,521
Commercial Land | 30-89 Days Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 0 1,521
Commercial Land | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases 1,887 1,910
Commercial Land | 90 Days or More Past Due | Small Business Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans and Leases $ 1,887 $ 1,910