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Allowance for Credit Losses - Allocation of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance $ 197,752 $ 268,018 $ 35,698
Initial ACL Recorded for PCD Loans     21,242
Charge-offs (13,719) (8,616) (19,858)
Recoveries 3,159 5,419 2,988
Provision for credit losses 8,459 (67,069) 172,262
Ending ACL Balance 195,651 197,752 268,018
Investor loans secured by real estate | CRE non-owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 37,380 49,176 1,899
Initial ACL Recorded for PCD Loans     3,025
Charge-offs (4,760) (154) (839)
Recoveries 0 78 44
Provision for credit losses 1,072 (11,720) 36,624
Ending ACL Balance 33,692 37,380 49,176
Investor loans secured by real estate | Multifamily      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 55,209 62,534 729
Initial ACL Recorded for PCD Loans     8,710
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 1,125 (7,325) 43,921
Ending ACL Balance 56,334 55,209 62,534
Investor loans secured by real estate | Construction and land      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 5,211 12,435 4,484
Initial ACL Recorded for PCD Loans     2,051
Charge-offs 0 0 (539)
Recoveries 0 0 0
Provision for credit losses 1,903 (7,224) 6,563
Ending ACL Balance 7,114 5,211 12,435
Investor loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 3,201 5,159 1,915
Initial ACL Recorded for PCD Loans     0
Charge-offs (70) (424) (705)
Recoveries 0 3 34
Provision for credit losses (539) (1,537) 5,316
Ending ACL Balance 2,592 3,201 5,159
Business loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 4,866 6,567 2,119
Initial ACL Recorded for PCD Loans     235
Charge-offs 0 (98) (338)
Recoveries 0 130 147
Provision for credit losses (518) (1,733) 2,197
Ending ACL Balance 4,348 4,866 6,567
Business loans secured by real estate | CRE owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 29,575 50,517 2,781
Initial ACL Recorded for PCD Loans     3,766
Charge-offs 0 0 (1,739)
Recoveries 56 56 59
Provision for credit losses 2,709 (20,998) 25,484
Ending ACL Balance 32,340 29,575 50,517
Business loans secured by real estate | Franchise real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 7,985 11,451 592
Initial ACL Recorded for PCD Loans     0
Charge-offs 0 0 (932)
Recoveries 0 0 0
Provision for credit losses (966) (3,466) 6,592
Ending ACL Balance 7,019 7,985 11,451
Commercial loans | Commercial and industrial      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 38,136 46,964 13,857
Initial ACL Recorded for PCD Loans     2,325
Charge-offs (8,387) (5,384) (6,891)
Recoveries 2,904 4,720 1,818
Provision for credit losses 2,516 (8,164) 35,768
Ending ACL Balance 35,169 38,136 46,964
Commercial loans | Franchise non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 15,084 20,525 5,816
Initial ACL Recorded for PCD Loans     0
Charge-offs (448) (2,554) (6,731)
Recoveries 0 405 866
Provision for credit losses 1,393 (3,292) 11,360
Ending ACL Balance 16,029 15,084 20,525
Commercial loans | SBA non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 565 995 445
Initial ACL Recorded for PCD Loans     924
Charge-offs (50) 0 (899)
Recoveries 51 21 14
Provision for credit losses (125) (451) 293
Ending ACL Balance 441 565 995
Retail loans | Single family residential      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 255 1,204 655
Initial ACL Recorded for PCD Loans     206
Charge-offs 0 0 (106)
Recoveries 148 3 2
Provision for credit losses (51) (952) (94)
Ending ACL Balance 352 255 1,204
Retail loans | Consumer      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance 285 491 406
Initial ACL Recorded for PCD Loans     0
Charge-offs (4) (2) (139)
Recoveries 0 3 4
Provision for credit losses (60) (207) (1,762)
Ending ACL Balance $ 221 $ 285 491
Cumulative effect of the change in accounting principle      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     55,686
Cumulative effect of the change in accounting principle | Investor loans secured by real estate | CRE non-owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     8,423
Cumulative effect of the change in accounting principle | Investor loans secured by real estate | Multifamily      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     9,174
Cumulative effect of the change in accounting principle | Investor loans secured by real estate | Construction and land      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     (124)
Cumulative effect of the change in accounting principle | Investor loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     (1,401)
Cumulative effect of the change in accounting principle | Business loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     2,207
Cumulative effect of the change in accounting principle | Business loans secured by real estate | CRE owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     20,166
Cumulative effect of the change in accounting principle | Business loans secured by real estate | Franchise real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     5,199
Cumulative effect of the change in accounting principle | Commercial loans | Commercial and industrial      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     87
Cumulative effect of the change in accounting principle | Commercial loans | Franchise non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     9,214
Cumulative effect of the change in accounting principle | Commercial loans | SBA non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     218
Cumulative effect of the change in accounting principle | Retail loans | Single family residential      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     541
Cumulative effect of the change in accounting principle | Retail loans | Consumer      
Allocation of allowance as well as the activity in allowance      
Beginning ACL Balance     $ 1,982