v3.26.1
Loans and Leases Held for Investment and Credit Quality - Schedule of Asset Quality Indicators by Portfolio Class and Origination Year (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Total loans held for investment          
Total $ 12,668,670   $ 12,668,670   $ 12,009,834
Year-To-Date Gross Charge-offs          
Charge offs 28,554 $ 32,947 50,538 $ 39,870  
Receivables Not Under the Fair Value Option          
Total loans held for investment          
Current fiscal year 1,321,103   1,321,103   3,022,630
Fiscal year before current fiscal year 3,160,872   3,160,872   2,219,587
Two years before current fiscal year 2,181,542   2,181,542   1,561,548
Three years before current fiscal year 1,426,074   1,426,074   1,561,548
Four years before current fiscal year 1,404,857   1,404,857   1,250,966
Prior 1,829,307   1,829,307   1,053,567
Revolving Loans Amortized Cost Basis 867,798   867,798   794,800
Revolving Loans Converted to Term 245,029   245,029   284,563
Total 12,436,582   12,436,582   11,749,209
Year-To-Date Gross Charge-offs          
Current fiscal year     88   3,472
Fiscal year before current fiscal year     3,557   5,518
Two years before current fiscal year     8,342   14,763
Three years before current fiscal year     9,924   16,079
Four years before current fiscal year     4,786   14,960
Five years before current fiscal year     7,081   5,624
Revolving Loans Amortized Cost Basis     8,946   4,689
Revolving Loans Converted to Term     7,814   9,070
Charge offs     50,538   74,175
Receivables Not Under the Fair Value Option | Small Business Banking          
Total loans held for investment          
Current fiscal year 713,750   713,750   1,560,828
Fiscal year before current fiscal year 1,774,025   1,774,025   1,376,999
Two years before current fiscal year 1,336,259   1,336,259   1,076,152
Three years before current fiscal year 989,203   989,203   1,209,592
Four years before current fiscal year 1,082,536   1,082,536   952,683
Prior 1,549,689   1,549,689   899,895
Revolving Loans Amortized Cost Basis 193,171   193,171   186,564
Revolving Loans Converted to Term 57,920   57,920   51,190
Total 7,696,553   7,696,553   7,313,903
Year-To-Date Gross Charge-offs          
Current fiscal year     88   3,472
Fiscal year before current fiscal year     3,557   5,518
Two years before current fiscal year     8,342   14,763
Three years before current fiscal year     9,924   12,693
Four years before current fiscal year     4,786   5,188
Five years before current fiscal year     6,925   5,453
Revolving Loans Amortized Cost Basis     8,616   4,352
Revolving Loans Converted to Term     537   2,523
Charge offs     42,775   53,962
Receivables Not Under the Fair Value Option | Small Business Banking | Pass          
Total loans held for investment          
Current fiscal year 713,070   713,070   1,513,435
Fiscal year before current fiscal year 1,699,588   1,699,588   1,245,114
Two years before current fiscal year 1,178,331   1,178,331   936,083
Three years before current fiscal year 847,851   847,851   1,000,904
Four years before current fiscal year 865,761   865,761   828,468
Prior 1,317,835   1,317,835   738,567
Revolving Loans Amortized Cost Basis 163,086   163,086   154,210
Revolving Loans Converted to Term 52,170   52,170   42,701
Total 6,837,692   6,837,692   6,459,482
Receivables Not Under the Fair Value Option | Small Business Banking | Special Mention          
Total loans held for investment          
Current fiscal year 295   295   17,102
Fiscal year before current fiscal year 35,323   35,323   68,453
Two years before current fiscal year 73,149   73,149   64,411
Three years before current fiscal year 54,192   54,192   93,132
Four years before current fiscal year 115,071   115,071   50,885
Prior 102,534   102,534   80,251
Revolving Loans Amortized Cost Basis 14,475   14,475   8,763
Revolving Loans Converted to Term 2,075   2,075   6,721
Total 397,114   397,114   389,718
Receivables Not Under the Fair Value Option | Small Business Banking | Substandard          
Total loans held for investment          
Current fiscal year 385   385   30,291
Fiscal year before current fiscal year 39,114   39,114   63,432
Two years before current fiscal year 84,779   84,779   75,658
Three years before current fiscal year 87,160   87,160   115,556
Four years before current fiscal year 101,704   101,704   73,330
Prior 129,320   129,320   81,077
Revolving Loans Amortized Cost Basis 15,610   15,610   23,591
Revolving Loans Converted to Term 3,675   3,675   1,768
Total 461,747   461,747   464,703
Receivables Not Under the Fair Value Option | Commercial Banking          
Total loans held for investment          
Current fiscal year 607,353   607,353   1,461,802
Fiscal year before current fiscal year 1,386,847   1,386,847   842,588
Two years before current fiscal year 845,283   845,283   485,396
Three years before current fiscal year 436,871   436,871   351,956
Four years before current fiscal year 322,321   322,321   298,283
Prior 279,618   279,618   153,672
Revolving Loans Amortized Cost Basis 674,627   674,627   608,236
Revolving Loans Converted to Term 187,109   187,109   233,373
Total 4,740,029   4,740,029   4,435,306
Year-To-Date Gross Charge-offs          
Current fiscal year     0   0
Fiscal year before current fiscal year     0   0
Two years before current fiscal year     0   0
Three years before current fiscal year     0   3,386
Four years before current fiscal year     0   9,772
Five years before current fiscal year     156   171
Revolving Loans Amortized Cost Basis     330   337
Revolving Loans Converted to Term     7,277   6,547
Charge offs     7,763   20,213
Receivables Not Under the Fair Value Option | Commercial Banking | Pass          
Total loans held for investment          
Current fiscal year 602,353   602,353   1,434,615
Fiscal year before current fiscal year 1,348,361   1,348,361   763,382
Two years before current fiscal year 793,240   793,240   405,425
Three years before current fiscal year 412,435   412,435   248,636
Four years before current fiscal year 240,967   240,967   150,616
Prior 196,410   196,410   105,386
Revolving Loans Amortized Cost Basis 613,792   613,792   581,047
Revolving Loans Converted to Term 160,654   160,654   210,917
Total 4,368,212   4,368,212   3,900,024
Receivables Not Under the Fair Value Option | Commercial Banking | Special Mention          
Total loans held for investment          
Current fiscal year 5,000   5,000   18,187
Fiscal year before current fiscal year 19,279   19,279   73,787
Two years before current fiscal year 43,704   43,704   79,971
Three years before current fiscal year 24,436   24,436   79,401
Four years before current fiscal year 57,481   57,481   40,071
Prior 31,557   31,557   17,734
Revolving Loans Amortized Cost Basis 54,994   54,994   12,627
Revolving Loans Converted to Term 10,916   10,916   15,743
Total 247,367   247,367   337,521
Receivables Not Under the Fair Value Option | Commercial Banking | Substandard          
Total loans held for investment          
Current fiscal year 0   0   9,000
Fiscal year before current fiscal year 19,207   19,207   5,419
Two years before current fiscal year 8,339   8,339   0
Three years before current fiscal year 0   0   23,919
Four years before current fiscal year 23,873   23,873   107,596
Prior 51,651   51,651   30,552
Revolving Loans Amortized Cost Basis 5,841   5,841   14,562
Revolving Loans Converted to Term 15,539   15,539   6,713
Total $ 124,450   $ 124,450   $ 197,761