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Allowance for Credit Losses - Allocation of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance $ 35,698 $ 36,072 $ 28,936
Initial ACL Recorded for PCD Loans 21,242    
Charge-offs (19,858) (7,853) (1,955)
Recoveries 2,988 344 935
Provision for credit losses 172,262 7,135 8,156
Ending ACL Balance 268,018 35,698 36,072
Other disclosures      
Loans Evaluated Individually for Impairment 29,200 22,842  
ALLL Attributed to Individually Evaluated Loans 126 0  
Loans Evaluated Collectively for Impairment   8,699,469  
ALLL Attributed to Collectively Evaluated Loans   35,698  
Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 55,686    
Ending ACL Balance   55,686  
Investor loans secured by real estate | CRE non-owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 1,899 1,624 1,273
Initial ACL Recorded for PCD Loans 3,025    
Charge-offs (839) (625) 0
Recoveries 44 0 0
Provision for credit losses 36,624 900 351
Ending ACL Balance 49,176 1,899 1,624
Other disclosures      
Loans Evaluated Individually for Impairment   1,088  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   2,069,053  
ALLL Attributed to Collectively Evaluated Loans   1,899  
Investor loans secured by real estate | CRE non-owner-occupied | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 8,423    
Ending ACL Balance   8,423  
Investor loans secured by real estate | Multifamily      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 729 740 614
Initial ACL Recorded for PCD Loans 8,710    
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 43,921 (11) 126
Ending ACL Balance 62,534 729 740
Other disclosures      
Loans Evaluated Individually for Impairment   0  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   1,575,726  
ALLL Attributed to Collectively Evaluated Loans   729  
Investor loans secured by real estate | Multifamily | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 9,174    
Ending ACL Balance   9,174  
Investor loans secured by real estate | Construction and land      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 4,484 5,964 5,565
Initial ACL Recorded for PCD Loans 2,051    
Charge-offs (539) 0 0
Recoveries 0 0 0
Provision for credit losses 6,563 (1,480) 399
Ending ACL Balance 12,435 4,484 5,964
Other disclosures      
Loans Evaluated Individually for Impairment   0  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   438,786  
ALLL Attributed to Collectively Evaluated Loans   4,484  
Investor loans secured by real estate | Construction and land | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance (124)    
Ending ACL Balance   (124)  
Investor loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 1,915 1,827 1,396
Initial ACL Recorded for PCD Loans 0    
Charge-offs (705) (742) 0
Recoveries 34 0 0
Provision for credit losses 5,316 830 431
Ending ACL Balance 5,159 1,915 1,827
Other disclosures      
Loans Evaluated Individually for Impairment   390  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   68,041  
ALLL Attributed to Collectively Evaluated Loans   1,915  
Investor loans secured by real estate | SBA secured by real estate | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance (1,401)    
Ending ACL Balance   (1,401)  
Business loans secured by real estate | SBA secured by real estate      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 2,119 1,824 901
Initial ACL Recorded for PCD Loans 235    
Charge-offs (338) (908) 0
Recoveries 147 10 0
Provision for credit losses 2,197 1,193 923
Ending ACL Balance 6,567 2,119 1,824
Other disclosures      
Loans Evaluated Individually for Impairment   1,517  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   86,864  
ALLL Attributed to Collectively Evaluated Loans   2,119  
Business loans secured by real estate | SBA secured by real estate | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 2,207    
Ending ACL Balance   2,207  
Business loans secured by real estate | CRE owner-occupied      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 2,781 1,908 923
Initial ACL Recorded for PCD Loans 3,766    
Charge-offs (1,739) (125) (33)
Recoveries 59 46 47
Provision for credit losses 25,484 952 971
Ending ACL Balance 50,517 2,781 1,908
Other disclosures      
Loans Evaluated Individually for Impairment   0  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   1,846,554  
ALLL Attributed to Collectively Evaluated Loans   2,781  
Business loans secured by real estate | CRE owner-occupied | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 20,166    
Ending ACL Balance   20,166  
Business loans secured by real estate | Franchise real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 592 743 602
Initial ACL Recorded for PCD Loans 0    
Charge-offs (932) (1,377) 0
Recoveries 0 0 0
Provision for credit losses 6,592 1,226 141
Ending ACL Balance 11,451 592 743
Other disclosures      
Loans Evaluated Individually for Impairment   0  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   353,240  
ALLL Attributed to Collectively Evaluated Loans   592  
Business loans secured by real estate | Franchise real estate secured | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 5,199    
Ending ACL Balance   5,199  
Commercial loans | Commercial and industrial      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 13,857 13,695 11,018
Initial ACL Recorded for PCD Loans 2,325    
Charge-offs (6,891) (2,318) (1,411)
Recoveries 1,818 189 698
Provision for credit losses 35,768 2,291 3,390
Ending ACL Balance 46,964 13,857 13,695
Other disclosures      
Loans Evaluated Individually for Impairment   7,529  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   1,385,741  
ALLL Attributed to Collectively Evaluated Loans   13,857  
Commercial loans | Commercial and industrial | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 87    
Ending ACL Balance   87  
Commercial loans | Franchise non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 5,816 6,066 5,191
Initial ACL Recorded for PCD Loans 0    
Charge-offs (6,731) (1,154) 0
Recoveries 866 18 0
Provision for credit losses 11,360 886 875
Ending ACL Balance 20,525 5,816 6,066
Other disclosures      
Loans Evaluated Individually for Impairment   10,834  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   553,523  
ALLL Attributed to Collectively Evaluated Loans   5,816  
Commercial loans | Franchise non-real estate secured | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 9,214    
Ending ACL Balance   9,214  
Commercial loans | SBA non-real estate secured      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 445 654 594
Initial ACL Recorded for PCD Loans 924    
Charge-offs (899) (588) (102)
Recoveries 14 68 169
Provision for credit losses 293 311 (7)
Ending ACL Balance 995 445 654
Other disclosures      
Loans Evaluated Individually for Impairment   1,118  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   16,308  
ALLL Attributed to Collectively Evaluated Loans   445  
Commercial loans | SBA non-real estate secured | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 218    
Ending ACL Balance   218  
Retail loans | Single family residential      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 655 808 804
Initial ACL Recorded for PCD Loans 206    
Charge-offs (106) 0 0
Recoveries 2 2 13
Provision for credit losses (94) (155) (9)
Ending ACL Balance 1,204 655 808
Other disclosures      
Loans Evaluated Individually for Impairment   366  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   254,658  
ALLL Attributed to Collectively Evaluated Loans   655  
Retail loans | Single family residential | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 541    
Ending ACL Balance   541  
Retail loans | Consumer      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance 406 219 55
Initial ACL Recorded for PCD Loans 0    
Charge-offs (139) (16) (409)
Recoveries 4 11 8
Provision for credit losses (1,762) 192 565
Ending ACL Balance 491 406 $ 219
Other disclosures      
Loans Evaluated Individually for Impairment   0  
ALLL Attributed to Individually Evaluated Loans   0  
Loans Evaluated Collectively for Impairment   50,975  
ALLL Attributed to Collectively Evaluated Loans   406  
Retail loans | Consumer | Impact of CECL Adoption      
Allocation of allowance as well as the activity in allowance      
Beginning ALLL Balance $ 1,982    
Ending ACL Balance   $ 1,982