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LOANS HELD FOR INVESTMENT - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance $ 324,958 $ 319,297 $ 385,887 $ 155,139
Impact of adopting ASC 326     (97,600)  
Loans and finance leases (8,734) 48,078 (49,479) 158,531
Charge-offs (34,366) (14,355) (68,466) (46,599)
Ending balance 288,360 384,718 288,360 384,718
Commercial Portfolio Segment [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Impact of adopting ASC 326     (46,600)  
Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 4,757 7,800 5,380 2,370
Loans and finance leases 527 2,405 (125) 7,068
Charge-offs (7) (1) (52) (75)
Ending balance 5,319 10,241 5,319 10,241
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 72,452 49,435 109,342 39,194
Loans and finance leases (4,660) 19,672 (40,779) 49,278
Charge-offs (429) (3,157) (1,304) (3,303)
Ending balance 67,406 75,726 67,406 75,726
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 37,470 38,310 37,944 15,198
Loans and finance leases (4,449) 2,839 (10,187) 11,225
Charge-offs (167) (150) (1,036) (323)
Ending balance 33,348 42,909 33,348 42,909
Entity Loan Modification Program [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs 450,078 496,207 479,196 487,997
Increases to existing TDRs (disbursements) 0 2,210 57 5,821
Charge-offs post modification (13,211) (4,548) (16,706) (8,063)
Paid-off and partial payments (12,779) (8,132) (37,964) (26,926)
Ending balance of TDRs 428,600 488,615 428,600 488,615
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs     3,423  
Ending balance of TDRs 3,044   3,044  
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs     64,438  
Paid-off and partial payments (92,400)      
Ending balance of TDRs 69,563   69,563  
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs     80,482  
Ending balance of TDRs 76,287   76,287  
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs 44,443 51,258 45,087 51,228
Increases to existing TDRs (disbursements) 0 367   772
Charge-offs post modification (29) (3,087) (129) (3,087)
Paid-off and partial payments (909) (385) (1,453) (760)
Ending balance of TDRs 43,505 48,153 43,505 48,153
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 0 4,084 401 3,530
Loans and finance leases 29 (599) (272) 281
Charge-offs (29) (3,087)    
Ending balance 0 398 0 398
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Increases to existing TDRs (disbursements)     0  
Loans And Leases Receivable Disclosure [Abstract]        
Charge-offs     (129) (3,087)
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Impact of adopting ASC 326     0 (326)
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs 1,476 1,892 1,562 1,883
Increases to existing TDRs (disbursements) 0 0 0 34
Charge-offs post modification 0 0 0 0
Paid-off and partial payments (44) (288) (130) (313)
Ending balance of TDRs 1,432 1,604 1,432 1,604
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 0 0 0 0
Loans and finance leases 0 0 0 0
Charge-offs 0 0 0 0
Ending balance 0 0 0 0
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Impact of adopting ASC 326     0 0
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs 16,225 22,599 16,475 22,749
Increases to existing TDRs (disbursements) 0 0 0 0
Charge-offs post modification (29) (3,087) (129) (3,087)
Paid-off and partial payments (77) (97) (227) (247)
Ending balance of TDRs 16,119 19,415 16,119 19,415
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 0 3,646 0 3,516
Loans and finance leases 29 (559) 129 (14)
Charge-offs (29) (3,087) (129) (3,087)
Ending balance 0 0 0 0
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Impact of adopting ASC 326     0 (415)
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Troubled Debt Restructuring [Abstract]        
Beginning Balance of TDRs 26,742 26,767 27,050 26,596
Increases to existing TDRs (disbursements) 0 367 0 738
Charge-offs post modification 0 0 0 0
Paid-off and partial payments (788) 0 (1,096) (200)
Ending balance of TDRs 25,954 27,134 25,954 27,134
Loans And Leases Receivable Disclosure [Abstract]        
Beginning balance 0 438 401 14
Loans and finance leases 0 (40) (401) 295
Charge-offs 0 0 0 0
Ending balance $ 0 $ 398 0 398
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]        
Loans And Leases Receivable Disclosure [Abstract]        
Impact of adopting ASC 326     $ 0 $ 89