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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

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