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Loans Held for Investment - Schedule of Internal Risk Grading System under ASC 326 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year $ 397,723 $ 3,033,849  
Fiscal Year before Current Fiscal Year 2,905,140 4,237,198  
Two Years before Current Fiscal Year 3,742,197 1,402,650  
Three Years before Current Fiscal Year 1,239,280 1,788,312  
Four Years before Current Fiscal Year 1,546,480 861,690  
Prior 2,395,055 2,206,015  
Revolving 1,066,289 1,203,904  
Revolving Converted to Term During the Period 26,407 4,606  
Total 13,289,020 14,676,298  
Loans held for investment before basis adjustment 13,318,571 14,738,224  
Current fiscal year charge off 132    
One year before current fiscal year charge off 3,053    
Two year before current fiscal year charge off 597    
Three year before current fiscal year charge off 196    
Four year before current fiscal year charge off 1,944    
Prior year before current fiscal year charge off 6,534    
Revolving charge off 6,390    
Revolving Converted to Term During the Period charge off 503    
Total 19,349 13,719 $ 8,616
Basis adjustment associated with fair value hedge      
Financing Receivable, Credit Quality Indicator [Line Items]      
Basis adjustment associated with fair value hedge 29,551 61,926  
Investor loans secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 310,500 1,948,392  
Fiscal Year before Current Fiscal Year 1,986,752 2,954,826  
Two Years before Current Fiscal Year 2,655,460 1,034,449  
Three Years before Current Fiscal Year 920,238 1,268,038  
Four Years before Current Fiscal Year 1,145,258 590,859  
Prior 1,557,818 1,416,489  
Revolving 0 0  
Revolving Converted to Term During the Period 0 463  
Total 8,576,026 9,213,516  
Current fiscal year charge off 0    
One year before current fiscal year charge off 0    
Two year before current fiscal year charge off 217    
Three year before current fiscal year charge off 0    
Four year before current fiscal year charge off 1,582    
Prior year before current fiscal year charge off 3,653    
Revolving charge off 0    
Revolving Converted to Term During the Period charge off 0    
Total 5,452    
Investor loans secured by real estate | CRE non-owner-occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,421,772 2,660,321  
Total 3,472 4,760 154
Investor loans secured by real estate | CRE non-owner-occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 71,452 523,895  
Fiscal Year before Current Fiscal Year 482,045 607,153  
Two Years before Current Fiscal Year 549,828 208,760  
Three Years before Current Fiscal Year 192,399 347,889  
Four Years before Current Fiscal Year 315,139 308,317  
Prior 795,856 651,593  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 2,406,719 2,647,607  
Investor loans secured by real estate | CRE non-owner-occupied | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 3,811 0  
Two Years before Current Fiscal Year 2,530 0  
Three Years before Current Fiscal Year 0 0  
Four Years before Current Fiscal Year 0 7,487  
Prior 625 0  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 6,966 7,487  
Investor loans secured by real estate | CRE non-owner-occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 412 0  
Two Years before Current Fiscal Year 0 0  
Three Years before Current Fiscal Year 0 0  
Four Years before Current Fiscal Year 0 194  
Prior 7,675 4,570  
Revolving 0 0  
Revolving Converted to Term During the Period 0 463  
Total 8,087 5,227  
Investor loans secured by real estate | Multifamily      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 5,645,310 6,112,026  
Total 1,872 0 0
Investor loans secured by real estate | Multifamily | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 179,055 1,230,359  
Fiscal Year before Current Fiscal Year 1,184,329 2,187,255  
Two Years before Current Fiscal Year 2,008,126 786,436  
Three Years before Current Fiscal Year 725,123 889,737  
Four Years before Current Fiscal Year 822,411 263,241  
Prior 714,638 732,808  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 5,633,682 6,089,836  
Investor loans secured by real estate | Multifamily | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
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 12,667  
Four Years before Current Fiscal Year 0 0  
Prior 11,628 0  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 11,628 12,667  
Investor loans secured by real estate | Multifamily | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year   0  
Fiscal Year before Current Fiscal Year   6,057  
Two Years before Current Fiscal Year   0  
Three Years before Current Fiscal Year   2,723  
Four Years before Current Fiscal Year   0  
Prior   743  
Revolving   0  
Revolving Converted to Term During the Period   0  
Total   9,523  
Investor loans secured by real estate | Construction and land      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 472,544 399,034  
Total 0 0 0
Investor loans secured by real estate | Construction and land | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 59,993 187,567  
Fiscal Year before Current Fiscal Year 309,677 154,231  
Two Years before Current Fiscal Year 94,845 38,760  
Three Years before Current Fiscal Year 2,223 9,615  
Four Years before Current Fiscal Year 2,368 1,843  
Prior 3,438 7,018  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 472,544 399,034  
Investor loans secured by real estate | SBA secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 36,400 42,135  
Total 108 70 424
Investor loans secured by real estate | SBA secured by real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 6,571  
Fiscal Year before Current Fiscal Year 6,478 130  
Two Years before Current Fiscal Year 0 493  
Three Years before Current Fiscal Year 493 5,407  
Four Years before Current Fiscal Year 4,804 7,361  
Prior 16,496 13,199  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 28,271 33,161  
Investor loans secured by real estate | SBA secured by real estate | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 0 0  
Two Years before Current Fiscal Year 131 0  
Three Years before Current Fiscal Year 0 0  
Four Years before Current Fiscal Year 536 2,416  
Prior 7,462 6,558  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 8,129 8,974  
Business loans secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 31,465 676,516  
Fiscal Year before Current Fiscal Year 632,163 873,443  
Two Years before Current Fiscal Year 797,090 289,937  
Three Years before Current Fiscal Year 257,990 299,206  
Four Years before Current Fiscal Year 243,137 158,541  
Prior 583,825 568,284  
Revolving 919 5,661  
Revolving Converted to Term During the Period 0 0  
Total 2,546,589 2,871,588  
Current fiscal year charge off 0    
One year before current fiscal year charge off 0    
Two year before current fiscal year charge off 318    
Three year before current fiscal year charge off 191    
Four year before current fiscal year charge off 0    
Prior year before current fiscal year charge off 1,861    
Revolving charge off 0    
Revolving Converted to Term During the Period charge off 0    
Total 2,370    
Business loans secured by real estate | SBA secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 50,741 61,368  
Total 0 0 98
Business loans secured by real estate | SBA secured by real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 113 10,993  
Fiscal Year before Current Fiscal Year 9,334 6,978  
Two Years before Current Fiscal Year 7,634 2,329  
Three Years before Current Fiscal Year 1,979 5,710  
Four Years before Current Fiscal Year 4,109 4,440  
Prior 22,417 25,415  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 45,586 55,865  
Business loans secured by real estate | SBA secured by real estate | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 536 0  
Two Years before Current Fiscal Year 0 0  
Three Years before Current Fiscal Year 0 0  
Four Years before Current Fiscal Year 0 0  
Prior 83 118  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 619 118  
Business loans secured by real estate | SBA secured by real estate | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
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 0  
Four Years before Current Fiscal Year 0 1,354  
Prior 4,536 4,031  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 4,536 5,385  
Business loans secured by real estate | CRE owner-occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,191,334 2,432,163  
Total 2,370 0 0
Business loans secured by real estate | CRE owner-occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 19,014 593,826  
Fiscal Year before Current Fiscal Year 543,413 718,223  
Two Years before Current Fiscal Year 660,967 242,125  
Three Years before Current Fiscal Year 224,333 240,772  
Four Years before Current Fiscal Year 211,283 114,581  
Prior 458,975 448,531  
Revolving 0 5,661  
Revolving Converted to Term During the Period 0 0  
Total 2,117,985 2,363,719  
Business loans secured by real estate | CRE owner-occupied | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 334  
Fiscal Year before Current Fiscal Year 16,535 1,015  
Two Years before Current Fiscal Year 0 0  
Three Years before Current Fiscal Year 476 0  
Four Years before Current Fiscal Year 4,775 675  
Prior 11,775 327  
Revolving 919 0  
Revolving Converted to Term During the Period 0 0  
Total 34,480 2,351  
Business loans secured by real estate | CRE owner-occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 10,838  
Fiscal Year before Current Fiscal Year 15,539 2,541  
Two Years before Current Fiscal Year 2,162 11,970  
Three Years before Current Fiscal Year 5,505 2,403  
Four Years before Current Fiscal Year 3,873 4,676  
Prior 11,790 33,665  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 38,869 66,093  
Business loans secured by real estate | Franchise real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 304,514 378,057  
Total 0 0 0
Business loans secured by real estate | Franchise real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 10,580 54,654  
Fiscal Year before Current Fiscal Year 39,239 131,541  
Two Years before Current Fiscal Year 124,424 33,513  
Three Years before Current Fiscal Year 25,697 44,229  
Four Years before Current Fiscal Year 15,731 32,815  
Prior 72,342 55,893  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 288,013 352,645  
Business loans secured by real estate | Franchise real estate secured | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 1,758 4,891  
Fiscal Year before Current Fiscal Year 3,603 13,145  
Two Years before Current Fiscal Year 1,903 0  
Three Years before Current Fiscal Year 0 0  
Four Years before Current Fiscal Year 795 0  
Prior 1,615 0  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 9,674 18,036  
Business loans secured by real estate | Franchise real estate secured | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 980  
Fiscal Year before Current Fiscal Year 3,964 0  
Two Years before Current Fiscal Year 0 0  
Three Years before Current Fiscal Year 0 6,092  
Four Years before Current Fiscal Year 2,571 0  
Prior 292 304  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 6,827 7,376  
Commercial loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 55,738 408,941  
Fiscal Year before Current Fiscal Year 286,225 408,923  
Two Years before Current Fiscal Year 289,644 78,071  
Three Years before Current Fiscal Year 60,876 221,057  
Four Years before Current Fiscal Year 158,080 112,268  
Prior 208,520 170,512  
Revolving 1,035,765 1,172,924  
Revolving Converted to Term During the Period 26,407 4,143  
Total 2,121,255 2,576,839  
Current fiscal year charge off 132    
One year before current fiscal year charge off 3,053    
Two year before current fiscal year charge off 62    
Three year before current fiscal year charge off 5    
Four year before current fiscal year charge off 362    
Prior year before current fiscal year charge off 37    
Revolving charge off 6,387    
Revolving Converted to Term During the Period charge off 503    
Total 10,541    
Commercial loans | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,790,608 2,160,948  
Total 10,474 8,387 5,384
Commercial loans | Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 46,765 282,131  
Fiscal Year before Current Fiscal Year 172,987 262,044  
Two Years before Current Fiscal Year 160,275 55,659  
Three Years before Current Fiscal Year 40,988 155,310  
Four Years before Current Fiscal Year 110,526 78,684  
Prior 146,310 121,918  
Revolving 966,733 1,134,568  
Revolving Converted to Term During the Period 6,518 3,412  
Total 1,651,102 2,093,726  
Commercial loans | Commercial and industrial | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 239 15,105  
Fiscal Year before Current Fiscal Year 23,242 3,567  
Two Years before Current Fiscal Year 12,270 798  
Three Years before Current Fiscal Year 367 0  
Four Years before Current Fiscal Year 16 1,864  
Prior 2,139 41  
Revolving 42,570 9,898  
Revolving Converted to Term During the Period 407 0  
Total 81,250 31,273  
Commercial loans | Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 425 2,590  
Fiscal Year before Current Fiscal Year 8,052 80  
Two Years before Current Fiscal Year 2,689 0  
Three Years before Current Fiscal Year 588 3,867  
Four Years before Current Fiscal Year 173 562  
Prior 1,138 1,029  
Revolving 26,462 27,680  
Revolving Converted to Term During the Period 14,187 141  
Total 53,714 35,949  
Commercial loans | Commercial and industrial | Doubtful and loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0    
Fiscal Year before Current Fiscal Year 0    
Two Years before Current Fiscal Year 0    
Three Years before Current Fiscal Year 0    
Four Years before Current Fiscal Year 0    
Prior 0    
Revolving 0    
Revolving Converted to Term During the Period 4,542    
Total 4,542    
Commercial loans | Franchise non-real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 319,721 404,791  
Total 0 448 2,554
Commercial loans | Franchise non-real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 6,801 102,542  
Fiscal Year before Current Fiscal Year 74,441 128,030  
Two Years before Current Fiscal Year 112,112 18,486  
Three Years before Current Fiscal Year 16,355 46,027  
Four Years before Current Fiscal Year 34,770 28,664  
Prior 53,957 43,486  
Revolving 0 778  
Revolving Converted to Term During the Period 753 0  
Total 299,189 368,013  
Commercial loans | Franchise non-real estate secured | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 433 1,372  
Fiscal Year before Current Fiscal Year 845 14,382  
Two Years before Current Fiscal Year 1,633 0  
Three Years before Current Fiscal Year 0 11,829  
Four Years before Current Fiscal Year 627 0  
Prior 692 0  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 4,230 27,583  
Commercial loans | Franchise non-real estate secured | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 1,757  
Fiscal Year before Current Fiscal Year 1,646 385  
Two Years before Current Fiscal Year 322 2,852  
Three Years before Current Fiscal Year 2,324 2,256  
Four Years before Current Fiscal Year 10,451 1,637  
Prior 1,559 308  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 16,302 9,195  
Commercial loans | SBA non-real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 10,926 11,100  
Total 67 50 0
Commercial loans | SBA non-real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 1,075 3,444  
Fiscal Year before Current Fiscal Year 4,485 435  
Two Years before Current Fiscal Year 343 276  
Three Years before Current Fiscal Year 113 1,638  
Four Years before Current Fiscal Year 1,464 633  
Prior 2,490 3,124  
Revolving 0 0  
Revolving Converted to Term During the Period 0 0  
Total 9,970 9,550  
Commercial loans | SBA non-real estate secured | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 527 0  
Two Years before Current Fiscal Year 0 0  
Three Years before Current Fiscal Year 141 130  
Four Years before Current Fiscal Year 53 224  
Prior 235 606  
Revolving 0 0  
Revolving Converted to Term During the Period 0 590  
Total 956 1,550  
Retail loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 20 0  
Fiscal Year before Current Fiscal Year 0 6  
Two Years before Current Fiscal Year 3 193  
Three Years before Current Fiscal Year 176 11  
Four Years before Current Fiscal Year 5 22  
Prior 44,892 50,730  
Revolving 29,605 25,319  
Revolving Converted to Term During the Period 0 0  
Total 74,701 76,281  
Current fiscal year charge off 0    
One year before current fiscal year charge off 0    
Two year before current fiscal year charge off 0    
Three year before current fiscal year charge off 0    
Four year before current fiscal year charge off 0    
Prior year before current fiscal year charge off 983    
Revolving charge off 3    
Revolving Converted to Term During the Period charge off 0    
Total 986    
Retail loans | Single family residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 72,752 72,997  
Total 90 0 0
Retail loans | Single family residential | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 20 0  
Fiscal Year before Current Fiscal Year 0 0  
Two Years before Current Fiscal Year 0 176  
Three Years before Current Fiscal Year 167 0  
Four Years before Current Fiscal Year 0 22  
Prior 44,104 49,729  
Revolving 28,461 23,065  
Revolving Converted to Term During the Period 0 0  
Total 72,752 72,992  
Retail loans | Single family residential | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year   0  
Fiscal Year before Current Fiscal Year   0  
Two Years before Current Fiscal Year   0  
Three Years before Current Fiscal Year   0  
Four Years before Current Fiscal Year   0  
Prior   5  
Revolving   0  
Revolving Converted to Term During the Period   0  
Total   5  
Retail loans | Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,949 3,284  
Total 896 4 $ 2
Retail loans | Consumer | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year 0 0  
Fiscal Year before Current Fiscal Year 0 6  
Two Years before Current Fiscal Year 3 17  
Three Years before Current Fiscal Year 9 11  
Four Years before Current Fiscal Year 5 0  
Prior 788 969  
Revolving 1,144 2,254  
Revolving Converted to Term During the Period 0 0  
Total $ 1,949 3,257  
Retail loans | Consumer | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year   0  
Fiscal Year before Current Fiscal Year   0  
Two Years before Current Fiscal Year   0  
Three Years before Current Fiscal Year   0  
Four Years before Current Fiscal Year   0  
Prior   27  
Revolving   0  
Revolving Converted to Term During the Period   0  
Total   27  
Retail loans | Consumer | Doubtful and loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current Fiscal Year   0  
Fiscal Year before Current Fiscal Year   0  
Two Years before Current Fiscal Year   0  
Three Years before Current Fiscal Year   0  
Four Years before Current Fiscal Year   0  
Prior   0  
Revolving   0  
Revolving Converted to Term During the Period   0  
Total   $ 0