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Loans Held for Investment - Internal Risk Grading System under ASC 326 (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 1,932,994 $ 1,862,085
Fiscal year before current fiscal year 1,830,360 3,354,750
Two years before current fiscal year 2,963,529 2,140,513
Three years before current fiscal year 1,819,329 1,729,763
Four years before current fiscal year 1,507,457 1,072,603
Prior 2,649,725 2,152,690
Revolving 889,352 912,643
Revolving Converted to Term During the Period 1,852 11,386
Total 13,594,598 13,236,433
Investor loans secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,365,536 1,351,350
Fiscal year before current fiscal year 1,350,055 2,386,517
Two years before current fiscal year 2,137,775 1,437,278
Three years before current fiscal year 1,249,591 988,649
Four years before current fiscal year 870,189 674,159
Prior 1,715,122 1,374,935
Revolving 12,160 12,877
Revolving Converted to Term During the Period 0 0
Total 8,700,428 8,225,765
Investor loans secured by real estate | CRE non-owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,810,233 2,675,085
Investor loans secured by real estate | CRE non-owner-occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 301,013 265,901
Fiscal year before current fiscal year 267,646 541,994
Two years before current fiscal year 477,241 440,351
Three years before current fiscal year 488,498 287,580
Four years before current fiscal year 272,907 279,238
Prior 923,821 791,477
Revolving 9,980 11,114
Revolving Converted to Term During the Period 0 0
Total 2,741,106 2,617,655
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 16,356 6,669
Three years before current fiscal year 3,395 437
Four years before current fiscal year 0 2,516
Prior 17,581 29,738
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 37,332 39,360
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 0 9,732
Two years before current fiscal year 25,834 2,045
Three years before current fiscal year 0 0
Four years before current fiscal year 0 516
Prior 5,424 5,218
Revolving 537 559
Revolving Converted to Term During the Period 0 0
Total 31,795 18,070
Investor loans secured by real estate | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,539,464 5,171,356
Investor loans secured by real estate | Multifamily | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,027,783 1,027,644
Fiscal year before current fiscal year 984,120 1,677,716
Two years before current fiscal year 1,514,852 899,123
Three years before current fiscal year 707,270 665,939
Four years before current fiscal year 570,526 354,859
Prior 727,578 531,287
Revolving 1,643 420
Revolving Converted to Term During the Period 0 0
Total 5,533,772 5,156,988
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 1,758
Two years before current fiscal year 1,745 2,630
Three years before current fiscal year 2,073 0
Four years before current fiscal year 0 8,649
Prior 0 0
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 3,818 13,037
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 0
Two years before current fiscal year 0 0
Three years before current fiscal year 544 559
Four years before current fiscal year 559 772
Prior 771 0
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 1,874 1,331
Investor loans secured by real estate | Construction and land    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 297,728 321,993
Investor loans secured by real estate | Construction and land | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 36,740 57,309
Fiscal year before current fiscal year 97,789 144,759
Two years before current fiscal year 93,185 73,313
Three years before current fiscal year 35,334 18,625
Four years before current fiscal year 8,765 20,531
Prior 25,915 6,672
Revolving 0 784
Revolving Converted to Term During the Period 0 0
Total 297,728 321,993
Investor loans secured by real estate | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 53,003 57,331
Investor loans secured by real estate | SBA secured by real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 500 8,306
Two years before current fiscal year 7,391 9,029
Three years before current fiscal year 10,116 13,418
Four years before current fiscal year 12,155 6,305
Prior 11,116 7,696
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 41,278 44,754
Investor loans secured by real estate | SBA secured by real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 496
Fiscal year before current fiscal year 0 1,032
Two years before current fiscal year 0 1,159
Three years before current fiscal year 0 1,000
Four years before current fiscal year 3,038 373
Prior 750 306
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 3,788 4,366
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 1,220
Two years before current fiscal year 1,171 2,959
Three years before current fiscal year 2,361 1,091
Four years before current fiscal year 2,239 400
Prior 2,166 2,541
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 7,937 8,211
Business loans secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 338,745 344,058
Fiscal year before current fiscal year 330,353 516,400
Two years before current fiscal year 440,622 422,995
Three years before current fiscal year 345,111 446,733
Four years before current fiscal year 381,622 267,062
Prior 680,837 529,565
Revolving 3,053 14,518
Revolving Converted to Term During the Period 0 246
Total 2,520,343 2,541,577
Business loans secured by real estate | CRE non-owner-occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year   344,058
Fiscal year before current fiscal year   516,400
Two years before current fiscal year   422,995
Three years before current fiscal year   446,733
Four years before current fiscal year   267,062
Prior   529,565
Revolving   14,518
Revolving Converted to Term During the Period   246
Total   2,541,577
Business loans secured by real estate | SBA secured by real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 72,923 79,595
Business loans secured by real estate | SBA secured by real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 2,502 3,253
Fiscal year before current fiscal year 3,423 7,637
Two years before current fiscal year 7,562 12,608
Three years before current fiscal year 11,398 16,058
Four years before current fiscal year 12,676 8,488
Prior 27,290 23,624
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 64,851 71,668
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 1,200
Three years before current fiscal year 0 0
Four years before current fiscal year 0 137
Prior 150 0
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 150 1,337
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 0 184
Three years before current fiscal year 1,336 1,987
Four years before current fiscal year 2,160 1,376
Prior 4,426 3,043
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 7,922 6,590
Business loans secured by real estate | CRE owner-occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,089,300 2,114,050
Business loans secured by real estate | CRE owner-occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 276,707 293,324
Fiscal year before current fiscal year 281,668 409,758
Two years before current fiscal year 355,162 332,672
Three years before current fiscal year 269,806 327,475
Four years before current fiscal year 278,179 225,098
Prior 596,013 469,704
Revolving 3,053 14,268
Revolving Converted to Term During the Period 0 246
Total 2,060,588 2,072,545
Business loans secured by real estate | CRE owner-occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 2,190
Fiscal year before current fiscal year 0 15,917
Two years before current fiscal year 6,086 3,802
Three years before current fiscal year 1,741 0
Four years before current fiscal year 3,043 4,153
Prior 0 201
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 10,870 26,263
Business loans secured by real estate | CRE owner-occupied | 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 3,636
Three years before current fiscal year 6,151 4,214
Four years before current fiscal year 5,873 1,169
Prior 5,818 5,973
Revolving 0 250
Revolving Converted to Term During the Period 0 0
Total 17,842 15,242
Business loans secured by real estate | Franchise real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 358,120 347,932
Business loans secured by real estate | Franchise real estate secured | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 59,536 44,413
Fiscal year before current fiscal year 44,384 81,438
Two years before current fiscal year 71,812 66,241
Three years before current fiscal year 54,679 96,999
Four years before current fiscal year 79,691 24,673
Prior 47,140 27,020
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 357,242 340,784
Business loans secured by real estate | Franchise real estate secured | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 878
Fiscal year before current fiscal year 878 1,650
Two years before current fiscal year 0 2,652
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 878 5,180
Business loans secured by real estate | Franchise real estate secured | 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   1,968
Prior   0
Revolving   0
Revolving Converted to Term During the Period   0
Total   1,968
Commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 215,357 155,831
Fiscal year before current fiscal year 143,142 444,000
Two years before current fiscal year 382,538 266,221
Three years before current fiscal year 222,333 280,317
Four years before current fiscal year 246,838 97,412
Prior 149,643 120,099
Revolving 848,656 854,568
Revolving Converted to Term During the Period 1,852 11,140
Total 2,210,359 2,229,588
Commercial loans | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,795,144 1,768,834
Commercial loans | Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 158,312 127,082
Fiscal year before current fiscal year 114,467 260,368
Two years before current fiscal year 243,248 159,001
Three years before current fiscal year 136,513 210,163
Four years before current fiscal year 189,735 51,800
Prior 95,416 82,291
Revolving 805,860 801,752
Revolving Converted to Term During the Period 1,852 9,315
Total 1,745,403 1,701,772
Commercial loans | Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 735
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 231 2,331
Three years before current fiscal year 0 185
Four years before current fiscal year 0 1,320
Prior 0 243
Revolving 13,558 17,890
Revolving Converted to Term During the Period 0 37
Total 13,789 22,741
Commercial loans | Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 1,940 3,310
Two years before current fiscal year 1,231 2,737
Three years before current fiscal year 3,334 610
Four years before current fiscal year 33 1,333
Prior 2,365 2,446
Revolving 27,049 32,858
Revolving Converted to Term During the Period 0 1,027
Total 35,952 44,321
Commercial loans | Franchise non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 401,315 444,797
Commercial loans | Franchise non-real estate secured | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 56,892 27,607
Fiscal year before current fiscal year 26,322 164,025
Two years before current fiscal year 133,288 94,494
Three years before current fiscal year 76,113 46,174
Four years before current fiscal year 35,506 40,829
Prior 45,833 27,745
Revolving 1,512 1,361
Revolving Converted to Term During the Period 0 502
Total 375,466 402,737
Commercial loans | Franchise non-real estate secured | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year   0
Fiscal year before current fiscal year   7,267
Two years before current fiscal year   2,037
Three years before current fiscal year   230
Four years before current fiscal year   480
Prior   2,321
Revolving   0
Revolving Converted to Term During the Period   0
Total   12,335
Commercial loans | Franchise non-real estate secured | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 6,690
Two years before current fiscal year 2,293 3,706
Three years before current fiscal year 4,559 18,425
Four years before current fiscal year 17,749 700
Prior 1,248 204
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 25,849 29,725
Commercial loans | SBA non-real estate secured    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 13,900 15,957
Commercial loans | SBA non-real estate secured | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 153 407
Fiscal year before current fiscal year 413 2,257
Two years before current fiscal year 2,167 1,558
Three years before current fiscal year 1,469 2,674
Four years before current fiscal year 3,557 610
Prior 4,060 4,449
Revolving 0 0
Revolving Converted to Term During the Period 0 259
Total 11,819 12,214
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   1,574
Four years before current fiscal year   0
Prior   0
Revolving   0
Revolving Converted to Term During the Period   0
Total   1,574
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 0 83
Two years before current fiscal year 80 357
Three years before current fiscal year 345 282
Four years before current fiscal year 258 340
Prior 721 400
Revolving 677 707
Revolving Converted to Term During the Period 0 0
Total 2,081 2,169
Retail loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,356 10,846
Fiscal year before current fiscal year 6,810 7,833
Two years before current fiscal year 2,594 14,019
Three years before current fiscal year 2,294 14,064
Four years before current fiscal year 8,808 33,970
Prior 104,123 128,091
Revolving 25,483 30,680
Revolving Converted to Term During the Period 0 0
Total 163,468 239,503
Retail loans | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 157,228 232,574
Retail loans | Single family residential | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,312 10,794
Fiscal year before current fiscal year 6,771 7,714
Two years before current fiscal year 2,524 13,982
Three years before current fiscal year 2,271 14,039
Four years before current fiscal year 8,789 33,968
Prior 101,020 124,248
Revolving 22,487 27,172
Revolving Converted to Term During the Period 0 0
Total 157,174 231,917
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 54 657
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 54 657
Retail loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 6,240 6,929
Retail loans | Consumer | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 44 52
Fiscal year before current fiscal year 39 112
Two years before current fiscal year 63 37
Three years before current fiscal year 23 25
Four years before current fiscal year 19 2
Prior 3,012 3,145
Revolving 2,996 3,508
Revolving Converted to Term During the Period 0 0
Total 6,196 6,881
Retail loans | Consumer | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 7
Two years before current fiscal year 7 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 37 41
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total $ 44 $ 48