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Allowance for Credit Losses - Amortized Cost of Loans by Estimated LTV and FICO Bands (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Allowance for Loan Losses    
Current Fiscal Year $ 4,696,852 $ 1,862,085
Fiscal Year before Current Fiscal Year 1,736,838 3,354,750
Two Years before Current Fiscal Year 2,322,876 2,140,513
Three Years before Current Fiscal Year 1,254,797 1,729,763
Four Years before Current Fiscal Year 1,143,567 1,072,603
Prior 2,014,563 2,152,690
Revolving 1,121,488 912,643
Revolving Converted to Term During the Period 4,916 11,386
Total 14,295,897 13,236,433
Investor loans secured by real estate    
Allowance for Loan Losses    
Current Fiscal Year 3,088,930 1,351,350
Fiscal Year before Current Fiscal Year 1,320,289 2,386,517
Two Years before Current Fiscal Year 1,681,360 1,437,278
Three Years before Current Fiscal Year 865,841 988,649
Four Years before Current Fiscal Year 717,023 674,159
Prior 1,304,033 1,374,935
Revolving 10,152 12,877
Revolving Converted to Term During the Period 0 0
Total 8,987,628 8,225,765
Investor loans secured by real estate | CRE non-owner-occupied    
Allowance for Loan Losses    
Total 2,771,137 2,675,085
Investor loans secured by real estate | CRE non-owner-occupied | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 366,617 138,007
Fiscal Year before Current Fiscal Year 141,752 229,272
Two Years before Current Fiscal Year 184,553 182,385
Three Years before Current Fiscal Year 171,879 136,355
Four Years before Current Fiscal Year 130,679 189,848
Prior 533,990 588,230
Revolving 9,866 11,114
Revolving Converted to Term During the Period 0 0
Total 1,539,336 1,475,211
Investor loans secured by real estate | CRE non-owner-occupied | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 277,092 101,434
Fiscal Year before Current Fiscal Year 91,539 217,210
Two Years before Current Fiscal Year 155,908 92,015
Three Years before Current Fiscal Year 86,933 130,024
Four Years before Current Fiscal Year 79,043 78,470
Prior 172,713 204,161
Revolving 0 559
Revolving Converted to Term During the Period 0 0
Total 863,228 823,873
Investor loans secured by real estate | CRE non-owner-occupied | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 64,619 26,460
Fiscal Year before Current Fiscal Year 36,653 102,494
Two Years before Current Fiscal Year 58,350 169,878
Three Years before Current Fiscal Year 131,975 18,876
Four Years before Current Fiscal Year 5,662 13,952
Prior 25,446 29,506
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 322,705 361,166
Investor loans secured by real estate | CRE non-owner-occupied | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 232 0
Fiscal Year before Current Fiscal Year 0 2,750
Two Years before Current Fiscal Year 36,229 4,787
Three Years before Current Fiscal Year 4,818 2,762
Four Years before Current Fiscal Year 3,004 0
Prior 1,585 4,536
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 45,868 14,835
Investor loans secured by real estate | Multifamily    
Allowance for Loan Losses    
Total 5,891,934 5,171,356
Investor loans secured by real estate | Multifamily | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 397,562 218,833
Fiscal Year before Current Fiscal Year 226,129 345,519
Two Years before Current Fiscal Year 285,520 294,464
Three Years before Current Fiscal Year 181,826 233,997
Four Years before Current Fiscal Year 197,276 84,530
Prior 279,880 269,906
Revolving 286 0
Revolving Converted to Term During the Period 0 0
Total 1,568,479 1,447,249
Investor loans secured by real estate | Multifamily | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 932,115 381,737
Fiscal Year before Current Fiscal Year 416,712 731,408
Two Years before Current Fiscal Year 510,840 381,282
Three Years before Current Fiscal Year 219,710 215,170
Four Years before Current Fiscal Year 185,773 152,066
Prior 198,802 189,151
Revolving 0 420
Revolving Converted to Term During the Period 0 0
Total 2,463,952 2,051,234
Investor loans secured by real estate | Multifamily | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 906,910 427,074
Fiscal Year before Current Fiscal Year 306,272 583,078
Two Years before Current Fiscal Year 391,686 215,389
Three Years before Current Fiscal Year 41,174 215,452
Four Years before Current Fiscal Year 94,142 127,684
Prior 67,964 66,457
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 1,808,148 1,635,134
Investor loans secured by real estate | Multifamily | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 24,121 0
Fiscal Year before Current Fiscal Year 3,014 19,469
Two Years before Current Fiscal Year 11,459 10,618
Three Years before Current Fiscal Year 2,737 1,879
Four Years before Current Fiscal Year 1,838 0
Prior 8,186 5,773
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 51,355 37,739
Investor loans secured by real estate | Construction and land    
Allowance for Loan Losses    
Total 277,640 321,993
Investor loans secured by real estate | Construction and land | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 116,575 57,309
Fiscal Year before Current Fiscal Year 95,293 105,308
Two Years before Current Fiscal Year 26,501 36,068
Three Years before Current Fiscal Year 4,172 18,625
Four Years before Current Fiscal Year 3,857 20,531
Prior 3,559 6,672
Revolving 0 784
Revolving Converted to Term During the Period 0 0
Total 249,957 245,297
Investor loans secured by real estate | Construction and land | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 2,957 0
Fiscal Year before Current Fiscal Year 2,428 36,113
Two Years before Current Fiscal Year 5,095 23,770
Three Years before Current Fiscal Year 6,650 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 17,130 59,883
Investor loans secured by real estate | Construction and land | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 0 0
Fiscal Year before Current Fiscal Year 0 3,338
Two Years before Current Fiscal Year 8,960 13,475
Three Years before Current Fiscal Year 1,593 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 10,553 16,813
Investor loans secured by real estate | Construction and land | Greater than 75%    
Allowance for Loan Losses    
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 0 0
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 0 0
Investor loans secured by real estate | SBA secured by real estate    
Allowance for Loan Losses    
Total 46,917 57,331
Investor loans secured by real estate | SBA secured by real estate | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 0 0
Fiscal Year before Current Fiscal Year 0 2,066
Two Years before Current Fiscal Year 0 649
Three Years before Current Fiscal Year 632 673
Four Years before Current Fiscal Year 693 317
Prior 2,159 778
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 3,484 4,483
Investor loans secured by real estate | SBA secured by real estate | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 0 0
Fiscal Year before Current Fiscal Year 0 2,427
Two Years before Current Fiscal Year 2,399 1,639
Three Years before Current Fiscal Year 1,950 4,008
Four Years before Current Fiscal Year 1,903 879
Prior 3,595 4,354
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 9,847 13,307
Investor loans secured by real estate | SBA secured by real estate | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 130 0
Fiscal Year before Current Fiscal Year 0 3,897
Two Years before Current Fiscal Year 2,767 3,882
Three Years before Current Fiscal Year 3,630 3,482
Four Years before Current Fiscal Year 4,444 4,519
Prior 4,346 1,884
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 15,317 17,664
Investor loans secured by real estate | SBA secured by real estate | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 0 496
Fiscal Year before Current Fiscal Year 497 2,168
Two Years before Current Fiscal Year 1,093 6,977
Three Years before Current Fiscal Year 6,162 7,346
Four Years before Current Fiscal Year 8,709 1,363
Prior 1,808 3,527
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 18,269 21,877
Business loans secured by real estate    
Allowance for Loan Losses    
Current Fiscal Year 1,015,804 344,058
Fiscal Year before Current Fiscal Year 312,168 516,400
Two Years before Current Fiscal Year 352,224 422,995
Three Years before Current Fiscal Year 218,944 446,733
Four Years before Current Fiscal Year 259,808 267,062
Prior 533,240 529,565
Revolving 8,099 14,518
Revolving Converted to Term During the Period 292 246
Total 2,700,579 2,541,577
Business loans secured by real estate | SBA secured by real estate    
Allowance for Loan Losses    
Total 69,184 79,595
Business loans secured by real estate | SBA secured by real estate | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 4,333 1,825
Fiscal Year before Current Fiscal Year 590 1,626
Two Years before Current Fiscal Year 1,821 5,332
Three Years before Current Fiscal Year 1,123 5,495
Four Years before Current Fiscal Year 4,512 3,615
Prior 14,850 13,582
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 27,229 31,475
Business loans secured by real estate | SBA secured by real estate | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 452 246
Fiscal Year before Current Fiscal Year 555 513
Two Years before Current Fiscal Year 199 1,795
Three Years before Current Fiscal Year 954 1,094
Four Years before Current Fiscal Year 1,524 3,586
Prior 8,497 5,448
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 12,181 12,682
Business loans secured by real estate | SBA secured by real estate | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 1,082 264
Fiscal Year before Current Fiscal Year 328 3,142
Two Years before Current Fiscal Year 3,478 1,515
Three Years before Current Fiscal Year 5,208 3,968
Four Years before Current Fiscal Year 4,853 1,586
Prior 2,793 4,043
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 17,742 14,518
Business loans secured by real estate | SBA secured by real estate | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 512 918
Fiscal Year before Current Fiscal Year 891 2,356
Two Years before Current Fiscal Year 1,833 5,350
Three Years before Current Fiscal Year 3,902 7,488
Four Years before Current Fiscal Year 2,535 1,214
Prior 2,359 3,594
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 12,032 20,920
Business loans secured by real estate | CRE owner-occupied    
Allowance for Loan Losses    
Total 2,251,014 2,114,050
Business loans secured by real estate | CRE owner-occupied | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 400,857 96,803
Fiscal Year before Current Fiscal Year 95,504 160,605
Two Years before Current Fiscal Year 107,766 157,868
Three Years before Current Fiscal Year 87,779 179,791
Four Years before Current Fiscal Year 134,184 131,795
Prior 347,926 328,188
Revolving 6,738 14,518
Revolving Converted to Term During the Period 292 246
Total 1,181,046 1,069,814
Business loans secured by real estate | CRE owner-occupied | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 214,798 72,044
Fiscal Year before Current Fiscal Year 67,639 91,028
Two Years before Current Fiscal Year 60,192 98,176
Three Years before Current Fiscal Year 32,283 94,712
Four Years before Current Fiscal Year 35,513 65,120
Prior 80,347 90,548
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 490,772 511,628
Business loans secured by real estate | CRE owner-occupied | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 188,022 71,692
Fiscal Year before Current Fiscal Year 78,589 152,920
Two Years before Current Fiscal Year 112,217 79,106
Three Years before Current Fiscal Year 41,874 43,832
Four Years before Current Fiscal Year 12,241 31,303
Prior 25,460 31,493
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 458,403 410,346
Business loans secured by real estate | CRE owner-occupied | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 49,367 54,975
Fiscal Year before Current Fiscal Year 31,737 21,122
Two Years before Current Fiscal Year 9,627 4,960
Three Years before Current Fiscal Year 5,774 13,354
Four Years before Current Fiscal Year 8,158 2,202
Prior 16,130 25,649
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 120,793 122,262
Business loans secured by real estate | Franchise real estate secured    
Allowance for Loan Losses    
Total 380,381 347,932
Business loans secured by real estate | Franchise real estate secured | 55% and below    
Allowance for Loan Losses    
Current Fiscal Year 32,189 20,801
Fiscal Year before Current Fiscal Year 16,889 10,470
Two Years before Current Fiscal Year 8,954 13,864
Three Years before Current Fiscal Year 12,469 20,956
Four Years before Current Fiscal Year 9,163 9,189
Prior 14,552 16,213
Revolving 1,361 0
Revolving Converted to Term During the Period 0 0
Total 95,577 91,493
Business loans secured by real estate | Franchise real estate secured | >55-65%    
Allowance for Loan Losses    
Current Fiscal Year 47,521 2,689
Fiscal Year before Current Fiscal Year 3,603 9,955
Two Years before Current Fiscal Year 10,270 16,001
Three Years before Current Fiscal Year 7,442 19,102
Four Years before Current Fiscal Year 4,749 6,855
Prior 9,349 2,333
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 82,934 56,935
Business loans secured by real estate | Franchise real estate secured | >65-75%    
Allowance for Loan Losses    
Current Fiscal Year 39,409 19,349
Fiscal Year before Current Fiscal Year 13,991 51,719
Two Years before Current Fiscal Year 32,743 23,258
Three Years before Current Fiscal Year 11,289 9,153
Four Years before Current Fiscal Year 29,641 10,597
Prior 9,768 7,236
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 136,841 121,312
Business loans secured by real estate | Franchise real estate secured | Greater than 75%    
Allowance for Loan Losses    
Current Fiscal Year 37,262 2,452
Fiscal Year before Current Fiscal Year 1,852 10,944
Two Years before Current Fiscal Year 3,124 15,770
Three Years before Current Fiscal Year 8,847 47,788
Four Years before Current Fiscal Year 12,735 0
Prior 1,209 1,238
Revolving 0 0
Revolving Converted to Term During the Period 0 0
Total 65,029 78,192
Retail loans    
Allowance for Loan Losses    
Current Fiscal Year 324 10,846
Fiscal Year before Current Fiscal Year 239 7,833
Two Years before Current Fiscal Year 54 14,019
Three Years before Current Fiscal Year 51 14,064
Four Years before Current Fiscal Year 2,019 33,970
Prior 70,237 128,091
Revolving 28,033 30,680
Revolving Converted to Term During the Period 0 0
Total 100,957 239,503
Retail loans | Single family residential    
Allowance for Loan Losses    
Total 95,292 232,574
Retail loans | Single family residential | Greater than 740    
Allowance for Loan Losses    
Current Fiscal Year 313 10,794
Fiscal Year before Current Fiscal Year 211 6,531
Two Years before Current Fiscal Year 0 12,679
Three Years before Current Fiscal Year 0 8,846
Four Years before Current Fiscal Year 1,446 28,222
Prior 40,605 81,838
Revolving 17,553 19,588
Revolving Converted to Term During the Period 0 0
Total 60,128 168,498
Retail loans | Single family residential | >680 - 740    
Allowance for Loan Losses    
Current Fiscal Year 0 0
Fiscal Year before Current Fiscal Year 0 1,183
Two Years before Current Fiscal Year 0 1,303
Three Years before Current Fiscal Year 32 4,732
Four Years before Current Fiscal Year 103 2,614
Prior 7,602 15,624
Revolving 5,579 6,685
Revolving Converted to Term During the Period 0 0
Total 13,316 32,141
Retail loans | Single family residential | >580 - 680    
Allowance for Loan Losses    
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 0 461
Four Years before Current Fiscal Year 450 3,132
Prior 6,989 7,473
Revolving 756 864
Revolving Converted to Term During the Period 0 0
Total 8,195 11,930
Retail loans | Single family residential | Less than 580    
Allowance for Loan Losses    
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 9 0
Prior 13,612 19,970
Revolving 32 35
Revolving Converted to Term During the Period 0 0
Total 13,653 20,005
Retail loans | Consumer    
Allowance for Loan Losses    
Total 5,665 6,929
Retail loans | Consumer | Greater than 740    
Allowance for Loan Losses    
Current Fiscal Year 7 52
Fiscal Year before Current Fiscal Year 28 69
Two Years before Current Fiscal Year 32 31
Three Years before Current Fiscal Year 19 22
Four Years before Current Fiscal Year 9 1
Prior 944 2,609
Revolving 2,196 2,198
Revolving Converted to Term During the Period 0 0
Total 3,235 4,982
Retail loans | Consumer | >680 - 740    
Allowance for Loan Losses    
Current Fiscal Year 4 0
Fiscal Year before Current Fiscal Year 0 35
Two Years before Current Fiscal Year 17 6
Three Years before Current Fiscal Year 0 3
Four Years before Current Fiscal Year 2 0
Prior 431 469
Revolving 1,859 1,227
Revolving Converted to Term During the Period 0 0
Total 2,313 1,740
Retail loans | Consumer | >580 - 680    
Allowance for Loan Losses    
Current Fiscal Year 0 0
Fiscal Year before Current Fiscal Year 0 15
Two Years before Current Fiscal Year 5 0
Three Years before Current Fiscal Year 0 0
Four Years before Current Fiscal Year 0 1
Prior 54 95
Revolving 42 56
Revolving Converted to Term During the Period 0 0
Total 101 167
Retail loans | Consumer | Less than 580    
Allowance for Loan Losses    
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 0 13
Revolving 16 27
Revolving Converted to Term During the Period 0 0
Total $ 16 $ 40