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Allowance for Credit Losses - Amortized Cost of Loans by Estimated LTV and FICO Bands (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Allowance for Loan Losses    
2020 $ 1,862,085  
2019 3,354,750  
2018 2,140,513  
2017 1,729,763  
2016 1,072,603  
Prior 2,152,690  
Revolving 912,643  
Revolving Converted to Term During the Period 11,386  
Total 13,236,433 $ 8,722,311
Investor loans secured by real estate    
Allowance for Loan Losses    
2020 1,351,350  
2019 2,386,517  
2018 1,437,278  
2017 988,649  
2016 674,159  
Prior 1,374,935  
Revolving 12,877  
Revolving Converted to Term During the Period 0  
Total 8,225,765 4,153,084
Investor loans secured by real estate | CRE non-owner-occupied    
Allowance for Loan Losses    
Total 2,675,085 2,070,141
Investor loans secured by real estate | CRE non-owner-occupied | 55% and below    
Allowance for Loan Losses    
2020 138,007  
2019 229,272  
2018 182,385  
2017 136,355  
2016 189,848  
Prior 588,230  
Revolving 11,114  
Revolving Converted to Term During the Period 0  
Total 1,475,211  
Investor loans secured by real estate | CRE non-owner-occupied | >55-65%    
Allowance for Loan Losses    
2020 101,434  
2019 217,210  
2018 92,015  
2017 130,024  
2016 78,470  
Prior 204,161  
Revolving 559  
Revolving Converted to Term During the Period 0  
Total 823,873  
Investor loans secured by real estate | CRE non-owner-occupied | >65-75%    
Allowance for Loan Losses    
2020 26,460  
2019 102,494  
2018 169,878  
2017 18,876  
2016 13,952  
Prior 29,506  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 361,166  
Investor loans secured by real estate | CRE non-owner-occupied | Greater than 75%    
Allowance for Loan Losses    
2020 0  
2019 2,750  
2018 4,787  
2017 2,762  
2016 0  
Prior 4,536  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 14,835  
Investor loans secured by real estate | Multifamily    
Allowance for Loan Losses    
Total 5,171,356 1,575,726
Investor loans secured by real estate | Multifamily | 55% and below    
Allowance for Loan Losses    
2020 218,833  
2019 345,519  
2018 294,464  
2017 233,997  
2016 84,530  
Prior 269,906  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 1,447,249  
Investor loans secured by real estate | Multifamily | >55-65%    
Allowance for Loan Losses    
2020 381,737  
2019 731,408  
2018 381,282  
2017 215,170  
2016 152,066  
Prior 189,151  
Revolving 420  
Revolving Converted to Term During the Period 0  
Total 2,051,234  
Investor loans secured by real estate | Multifamily | >65-75%    
Allowance for Loan Losses    
2020 427,074  
2019 583,078  
2018 215,389  
2017 215,452  
2016 127,684  
Prior 66,457  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 1,635,134  
Investor loans secured by real estate | Multifamily | Greater than 75%    
Allowance for Loan Losses    
2020 0  
2019 19,469  
2018 10,618  
2017 1,879  
2016 0  
Prior 5,773  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 37,739  
Investor loans secured by real estate | Construction and land    
Allowance for Loan Losses    
Total 321,993 438,786
Investor loans secured by real estate | Construction and land | 55% and below    
Allowance for Loan Losses    
2020 57,309  
2019 105,308  
2018 36,068  
2017 18,625  
2016 20,531  
Prior 6,672  
Revolving 784  
Revolving Converted to Term During the Period 0  
Total 245,297  
Investor loans secured by real estate | Construction and land | >55-65%    
Allowance for Loan Losses    
2020 0  
2019 36,113  
2018 23,770  
2017 0  
2016 0  
Prior 0  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 59,883  
Investor loans secured by real estate | Construction and land | >65-75%    
Allowance for Loan Losses    
2020 0  
2019 3,338  
2018 13,475  
2017 0  
2016 0  
Prior 0  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 16,813  
Investor loans secured by real estate | Construction and land | Greater than 75%    
Allowance for Loan Losses    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 0  
Investor loans secured by real estate | SBA secured by real estate    
Allowance for Loan Losses    
Total 57,331 68,431
Investor loans secured by real estate | SBA secured by real estate | 55% and below    
Allowance for Loan Losses    
2020 0  
2019 2,066  
2018 649  
2017 673  
2016 317  
Prior 778  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 4,483  
Investor loans secured by real estate | SBA secured by real estate | >55-65%    
Allowance for Loan Losses    
2020 0  
2019 2,427  
2018 1,639  
2017 4,008  
2016 879  
Prior 4,354  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 13,307  
Investor loans secured by real estate | SBA secured by real estate | >65-75%    
Allowance for Loan Losses    
2020 0  
2019 3,897  
2018 3,882  
2017 3,482  
2016 4,519  
Prior 1,884  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 17,664  
Investor loans secured by real estate | SBA secured by real estate | Greater than 75%    
Allowance for Loan Losses    
2020 496  
2019 2,168  
2018 6,977  
2017 7,346  
2016 1,363  
Prior 3,527  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 21,877  
Business loans secured by real estate    
Allowance for Loan Losses    
2020 344,058  
2019 516,400  
2018 422,995  
2017 446,733  
2016 267,062  
Prior 529,565  
Revolving 14,518  
Revolving Converted to Term During the Period 246  
Total 2,541,577 2,288,175
Business loans secured by real estate | SBA secured by real estate    
Allowance for Loan Losses    
Total 79,595 88,381
Business loans secured by real estate | SBA secured by real estate | 55% and below    
Allowance for Loan Losses    
2020 1,825  
2019 1,626  
2018 5,332  
2017 5,495  
2016 3,615  
Prior 13,582  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 31,475  
Business loans secured by real estate | SBA secured by real estate | >55-65%    
Allowance for Loan Losses    
2020 246  
2019 513  
2018 1,795  
2017 1,094  
2016 3,586  
Prior 5,448  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 12,682  
Business loans secured by real estate | SBA secured by real estate | >65-75%    
Allowance for Loan Losses    
2020 264  
2019 3,142  
2018 1,515  
2017 3,968  
2016 1,586  
Prior 4,043  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 14,518  
Business loans secured by real estate | SBA secured by real estate | Greater than 75%    
Allowance for Loan Losses    
2020 918  
2019 2,356  
2018 5,350  
2017 7,488  
2016 1,214  
Prior 3,594  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 20,920  
Business loans secured by real estate | CRE owner-occupied    
Allowance for Loan Losses    
Total 2,114,050 1,846,554
Business loans secured by real estate | CRE owner-occupied | 55% and below    
Allowance for Loan Losses    
2020 96,803  
2019 160,605  
2018 157,868  
2017 179,791  
2016 131,795  
Prior 328,188  
Revolving 14,518  
Revolving Converted to Term During the Period 246  
Total 1,069,814  
Business loans secured by real estate | CRE owner-occupied | >55-65%    
Allowance for Loan Losses    
2020 72,044  
2019 91,028  
2018 98,176  
2017 94,712  
2016 65,120  
Prior 90,548  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 511,628  
Business loans secured by real estate | CRE owner-occupied | >65-75%    
Allowance for Loan Losses    
2020 71,692  
2019 152,920  
2018 79,106  
2017 43,832  
2016 31,303  
Prior 31,493  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 410,346  
Business loans secured by real estate | CRE owner-occupied | Greater than 75%    
Allowance for Loan Losses    
2020 54,975  
2019 21,122  
2018 4,960  
2017 13,354  
2016 2,202  
Prior 25,649  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 122,262  
Business loans secured by real estate | Franchise real estate secured    
Allowance for Loan Losses    
Total 347,932 353,240
Business loans secured by real estate | Franchise real estate secured | 55% and below    
Allowance for Loan Losses    
2020 20,801  
2019 10,470  
2018 13,864  
2017 20,956  
2016 9,189  
Prior 16,213  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 91,493  
Business loans secured by real estate | Franchise real estate secured | >55-65%    
Allowance for Loan Losses    
2020 2,689  
2019 9,955  
2018 16,001  
2017 19,102  
2016 6,855  
Prior 2,333  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 56,935  
Business loans secured by real estate | Franchise real estate secured | >65-75%    
Allowance for Loan Losses    
2020 19,349  
2019 51,719  
2018 23,258  
2017 9,153  
2016 10,597  
Prior 7,236  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 121,312  
Business loans secured by real estate | Franchise real estate secured | Greater than 75%    
Allowance for Loan Losses    
2020 2,452  
2019 10,944  
2018 15,770  
2017 47,788  
2016 0  
Prior 1,238  
Revolving 0  
Revolving Converted to Term During the Period 0  
Total 78,192  
Retail loans    
Allowance for Loan Losses    
2020 10,846  
2019 7,833  
2018 14,019  
2017 14,064  
2016 33,970  
Prior 128,091  
Revolving 30,680  
Revolving Converted to Term During the Period 0  
Total 239,503 305,999
Retail loans | Single family residential    
Allowance for Loan Losses    
Total 232,574 255,024
Retail loans | Single family residential | Greater than 740    
Allowance for Loan Losses    
2020 10,794  
2019 6,531  
2018 12,679  
2017 8,846  
2016 28,222  
Prior 81,838  
Revolving 19,588  
Revolving Converted to Term During the Period 0  
Total 168,498  
Retail loans | Single family residential | >680 - 740    
Allowance for Loan Losses    
2020 0  
2019 1,183  
2018 1,303  
2017 4,732  
2016 2,614  
Prior 15,624  
Revolving 6,685  
Revolving Converted to Term During the Period 0  
Total 32,141  
Retail loans | Single family residential | >580 - 680    
Allowance for Loan Losses    
2020 0  
2019 0  
2018 0  
2017 461  
2016 3,132  
Prior 7,473  
Revolving 864  
Revolving Converted to Term During the Period 0  
Total 11,930  
Retail loans | Single family residential | Less than 580    
Allowance for Loan Losses    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 19,970  
Revolving 35  
Revolving Converted to Term During the Period 0  
Total 20,005  
Retail loans | Consumer    
Allowance for Loan Losses    
Total 6,929 $ 50,975
Retail loans | Consumer | Greater than 740    
Allowance for Loan Losses    
2020 52  
2019 69  
2018 31  
2017 22  
2016 1  
Prior 2,609  
Revolving 2,198  
Revolving Converted to Term During the Period 0  
Total 4,982  
Retail loans | Consumer | >680 - 740    
Allowance for Loan Losses    
2020 0  
2019 35  
2018 6  
2017 3  
2016 0  
Prior 469  
Revolving 1,227  
Revolving Converted to Term During the Period 0  
Total 1,740  
Retail loans | Consumer | >580 - 680    
Allowance for Loan Losses    
2020 0  
2019 15  
2018 0  
2017 0  
2016 1  
Prior 95  
Revolving 56  
Revolving Converted to Term During the Period 0  
Total 167  
Retail loans | Consumer | Less than 580    
Allowance for Loan Losses    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 13  
Revolving 27  
Revolving Converted to Term During the Period 0  
Total $ 40