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Loans Held for Investment - Internal Risk Grading System under ASC 326 (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 93,801   $ 3,033,849
Fiscal Year before current fiscal year 3,016,379   4,237,198
Two Years before current fiscal year 4,156,515   1,402,650
Three Years before current fiscal year 1,351,847   1,788,312
Four Years before current fiscal year 1,726,528   861,690
Prior 2,845,550   2,206,015
Revolving 1,030,835   1,203,904
Revolving Converted to Term During the Period 334   4,606
Total 14,221,789   14,738,224
Current fiscal year charge off 0    
One year before current fiscal year charge off 177    
Two year before current fiscal year charge off 583    
Three year before current fiscal year charge off 5    
Four year before current fiscal year charge off 289    
Prior year before current fiscal year charge off 2,034    
Revolving charge off 576    
Revolving Converted to Term During the Period charge off 0    
Total 3,664 $ 2,299  
Basis adjustment associated with fair value hedge      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 14,221,789   14,738,224
Basis adjustment associated with fair value hedge 50,005   61,926
Investor loans secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 46,919   1,948,392
Fiscal Year before current fiscal year 1,962,699   2,954,826
Two Years before current fiscal year 2,918,202   1,034,449
Three Years before current fiscal year 994,941   1,268,038
Four Years before current fiscal year 1,229,957   590,859
Prior 1,852,651   1,416,489
Revolving 1,442   0
Revolving Converted to Term During the Period 0   463
Total 9,006,811   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 0    
Prior year before current fiscal year charge off 66    
Revolving charge off 0    
Revolving Converted to Term During the Period charge off 0    
Total 283    
Investor loans secured by real estate | CRE non-owner-occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,590,824   2,660,321
Total 66 0  
Investor loans secured by real estate | CRE non-owner-occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 10,306   523,895
Fiscal Year before current fiscal year 526,084   607,153
Two Years before current fiscal year 604,909   208,760
Three Years before current fiscal year 199,161   347,889
Four Years before current fiscal year 318,943   308,317
Prior 913,142   651,593
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 2,572,545   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 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   7,487
Prior 5,104   0
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 5,104   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 450   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 12,725   4,570
Revolving 0   0
Revolving Converted to Term During the Period 0   463
Total 13,175   5,227
Investor loans secured by real estate | Multifamily      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 5,955,239   6,112,026
Total 217 0  
Investor loans secured by real estate | Multifamily | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 11,931   1,230,359
Fiscal Year before current fiscal year 1,216,585   2,187,255
Two Years before current fiscal year 2,158,819   786,436
Three Years before current fiscal year 778,678   889,737
Four Years before current fiscal year 885,448   263,241
Prior 886,728   732,808
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 5,938,189   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 12,604   0
Prior 0   0
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 12,604   12,667
Investor loans secured by real estate | Multifamily | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 0   0
Fiscal Year before current fiscal year 0   6,057
Two Years before current fiscal year 985   0
Three Years before current fiscal year 0   2,723
Four Years before current fiscal year 2,723   0
Prior 738   743
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 4,446   9,523
Investor loans secured by real estate | Construction and land      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 420,079   399,034
Total 0 0  
Investor loans secured by real estate | Construction and land | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 24,682   187,567
Fiscal Year before current fiscal year 213,034   154,231
Two Years before current fiscal year 153,359   38,760
Three Years before current fiscal year 16,609   9,615
Four Years before current fiscal year 4,876   1,843
Prior 6,077   7,018
Revolving 1,442   0
Revolving Converted to Term During the Period 0   0
Total 420,079   399,034
Investor loans secured by real estate | SBA secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 40,669   42,135
Total 0 70  
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 6,546   130
Two Years before current fiscal year 130   493
Three Years before current fiscal year 493   5,407
Four Years before current fiscal year 5,363   7,361
Prior 19,211   13,199
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 31,743   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 0   0
Three Years before current fiscal year 0   0
Four Years before current fiscal year 0   2,416
Prior 8,926   6,558
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 8,926   8,974
Business loans secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 18,175   676,516
Fiscal Year before current fiscal year 659,651   873,443
Two Years before current fiscal year 843,600   289,937
Three Years before current fiscal year 280,711   299,206
Four Years before current fiscal year 286,809   158,541
Prior 679,863   568,284
Revolving 5,795   5,661
Revolving Converted to Term During the Period 0   0
Total 2,774,604   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 0    
Four year before current fiscal year charge off 0    
Prior year before current fiscal year charge off 1,845    
Revolving charge off 0    
Revolving Converted to Term During the Period charge off 0    
Total 2,163    
Business loans secured by real estate | SBA secured by real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 60,527   61,368
Total 0 0  
Business loans secured by real estate | SBA secured by real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 116   10,993
Fiscal Year before current fiscal year 10,724   6,978
Two Years before current fiscal year 8,168   2,329
Three Years before current fiscal year 2,131   5,710
Four Years before current fiscal year 5,648   4,440
Prior 28,285   25,415
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 55,072   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 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   0
Prior 195   118
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 195   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 5,260   4,031
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 5,260   5,385
Business loans secured by real estate | CRE owner-occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,342,175   2,432,163
Total 2,163 0  
Business loans secured by real estate | CRE owner-occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 8,779   593,826
Fiscal Year before current fiscal year 579,514   718,223
Two Years before current fiscal year 689,292   242,125
Three Years before current fiscal year 234,096   240,772
Four Years before current fiscal year 233,804   114,581
Prior 512,531   448,531
Revolving 5,795   5,661
Revolving Converted to Term During the Period 0   0
Total 2,263,811   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 3,920   1,015
Two Years before current fiscal year 2,836   0
Three Years before current fiscal year 0   0
Four Years before current fiscal year 0   675
Prior 11,623   327
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 18,379   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 11,078   2,541
Two Years before current fiscal year 1,007   11,970
Three Years before current fiscal year 11,339   2,403
Four Years before current fiscal year 0   4,676
Prior 36,561   33,665
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 59,985   66,093
Business loans secured by real estate | Franchise real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 371,902   378,057
Total 0 0  
Business loans secured by real estate | Franchise real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 8,551   54,654
Fiscal Year before current fiscal year 45,691   131,541
Two Years before current fiscal year 125,282   33,513
Three Years before current fiscal year 33,145   44,229
Four Years before current fiscal year 40,580   32,815
Prior 85,108   55,893
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 338,357   352,645
Business loans secured by real estate | Franchise real estate secured | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 729   4,891
Fiscal Year before current fiscal year 7,766   13,145
Two Years before current fiscal year 17,015   0
Three Years before current fiscal year 0   0
Four Years before current fiscal year 836   0
Prior 0   0
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 26,346   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 958   0
Two Years before current fiscal year 0   0
Three Years before current fiscal year 0   6,092
Four Years before current fiscal year 5,941   0
Prior 300   304
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 7,199   7,376
Commercial loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 28,707   408,941
Fiscal Year before current fiscal year 394,029   408,923
Two Years before current fiscal year 394,710   78,071
Three Years before current fiscal year 76,007   221,057
Four Years before current fiscal year 209,752   112,268
Prior 264,665   170,512
Revolving 998,083   1,172,924
Revolving Converted to Term During the Period 334   4,143
Total 2,366,287   2,576,839
Current fiscal year charge off 0    
One year before current fiscal year charge off 177    
Two year before current fiscal year charge off 48    
Three year before current fiscal year charge off 5    
Four year before current fiscal year charge off 289    
Prior year before current fiscal year charge off 30    
Revolving charge off 574    
Revolving Converted to Term During the Period charge off 0    
Total 1,123    
Commercial loans | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,967,128   2,160,948
Total 1,123 2,179  
Commercial loans | Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 23,116   282,131
Fiscal Year before current fiscal year 274,813   262,044
Two Years before current fiscal year 251,865   55,659
Three Years before current fiscal year 54,249   155,310
Four Years before current fiscal year 150,173   78,684
Prior 188,547   121,918
Revolving 942,518   1,134,568
Revolving Converted to Term During the Period 334   3,412
Total 1,885,615   2,093,726
Commercial loans | Commercial and industrial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 0   15,105
Fiscal Year before current fiscal year 1,804   3,567
Two Years before current fiscal year 1,626   798
Three Years before current fiscal year 0   0
Four Years before current fiscal year 595   1,864
Prior 1,501   41
Revolving 24,140   9,898
Revolving Converted to Term During the Period 0   0
Total 29,666   31,273
Commercial loans | Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 0   2,590
Fiscal Year before current fiscal year 15,900   80
Two Years before current fiscal year 3,294   0
Three Years before current fiscal year 746   3,867
Four Years before current fiscal year 4   562
Prior 1,255   1,029
Revolving 30,648   27,680
Revolving Converted to Term During the Period 0   141
Total 51,847   35,949
Commercial loans | Franchise non-real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 388,722   404,791
Total 0 0  
Commercial loans | Franchise non-real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 5,573   102,542
Fiscal Year before current fiscal year 93,172   128,030
Two Years before current fiscal year 121,323   18,486
Three Years before current fiscal year 17,959   46,027
Four Years before current fiscal year 43,011   28,664
Prior 67,423   43,486
Revolving 777   778
Revolving Converted to Term During the Period 0   0
Total 349,238   368,013
Commercial loans | Franchise non-real estate secured | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 0   1,372
Fiscal Year before current fiscal year 2,699   14,382
Two Years before current fiscal year 15,876   0
Three Years before current fiscal year 0   11,829
Four Years before current fiscal year 12,142   0
Prior 0   0
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 30,717   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 1,683   385
Two Years before current fiscal year 369   2,852
Three Years before current fiscal year 2,783   2,256
Four Years before current fiscal year 2,103   1,637
Prior 1,829   308
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 8,767   9,195
Commercial loans | SBA non-real estate secured      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 10,437   11,100
Total 0 50  
Commercial loans | SBA non-real estate secured | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 18   3,444
Fiscal Year before current fiscal year 3,386   435
Two Years before current fiscal year 357   276
Three Years before current fiscal year 270   1,638
Four Years before current fiscal year 1,597   633
Prior 3,341   3,124
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 8,969   9,550
Commercial loans | SBA non-real estate secured | Special Mention      
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
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 572   0
Two Years before current fiscal year 0   0
Three Years before current fiscal year 0   130
Four Years before current fiscal year 127   224
Prior 769   606
Revolving 0   0
Revolving Converted to Term During the Period 0   590
Total 1,468   1,550
Retail loans      
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   193
Three Years before current fiscal year 188   11
Four Years before current fiscal year 10   22
Prior 48,371   50,730
Revolving 25,515   25,319
Revolving Converted to Term During the Period 0   0
Total 74,087   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 93    
Revolving charge off 2    
Revolving Converted to Term During the Period charge off 0    
Total 95    
Retail loans | Single family residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 70,913   72,997
Total 90 0  
Retail loans | Single family residential | Pass      
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   176
Three Years before current fiscal year 174   0
Four Years before current fiscal year 0   22
Prior 47,453   49,729
Revolving 23,282   23,065
Revolving Converted to Term During the Period 0   0
Total 70,909   72,992
Retail loans | Single family residential | 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   0
Prior 4   5
Revolving 0   0
Revolving Converted to Term During the Period 0   0
Total 4   5
Retail loans | Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 3,174   3,284
Total 5 $ 0  
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 14   11
Four Years before current fiscal year 10   0
Prior 914   969
Revolving 2,233   2,254
Revolving Converted to Term During the Period 0   0
Total $ 3,174   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