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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
Jan. 01, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance $ 155,139 $ 319,297   $ 172,011 $ 155,139 $ 196,362
Impact of adopting ASC 326         229,600  
Charges to the provision for loan losses   48,078 $ 36,400 7,398 158,531 31,752
Ending balance   384,718 319,297 165,575 384,718 165,575
Accounting Standards Update 2016-13 [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Ending balance 236,304          
Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Impact of adopting ASC 326 (434)          
Ending balance 81,165          
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 2,370 7,800   3,026 2,370 3,592
Charges to the provision for loan losses   2,405   (178) 7,068 (815)
Ending balance   10,241 7,800 3,059 10,241 3,059
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Accounting Standards Update 2016-13 [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Ending balance 3,167          
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]            
Ending balance 797          
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 39,194 49,435   46,373 39,194 55,581
Charges to the provision for loan losses   19,672   (808) 49,278 3,854
Ending balance   75,726 49,435 44,848 75,726 44,848
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Accounting Standards Update 2016-13 [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Ending balance 19,888          
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]            
Ending balance (19,306)          
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 15,198 38,310   21,644 15,198 32,546
Charges to the provision for loan losses   2,839   (5,465) 11,225 (11,068)
Ending balance   42,909 38,310 17,618 42,909 17,618
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Accounting Standards Update 2016-13 [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Ending balance 29,929          
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]            
Ending balance 14,731          
Entity Loan Modification Program [Member]            
Financing Receivable, Troubled Debt Restructuring [Abstract]            
Beginning Balance of TDRs 487,997 496,207   582,389 487,997 582,647
New TDRs loans splits   3,187   22,111 31,733 54,531
Increases to existing TDRs   2,210   125 5,821 1,647
Charge offs   4,548   2,505 8,063 7,418
Paid-off and partial payments   (8,132)   (103,566) (26,926) (125,932)
Ending balance of TDRs   488,615 496,207 495,838 488,615 495,838
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Financing Receivable, Troubled Debt Restructuring [Abstract]            
Beginning Balance of TDRs 4,321       4,321  
Ending balance of TDRs   3,494     3,494  
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Financing Receivable, Troubled Debt Restructuring [Abstract]            
Beginning Balance of TDRs 74,979       74,979  
Paid-off and partial payments   (92,400)     (92,400)  
Ending balance of TDRs   67,600     67,600  
Entity Loan Modification Program [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]            
Financing Receivable, Troubled Debt Restructuring [Abstract]            
Beginning Balance of TDRs 66,849       66,849  
Ending balance of TDRs   83,517     83,517  
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member]            
Financing Receivable, Troubled Debt Restructuring [Abstract]            
Beginning Balance of TDRs 51,228 51,258   53,216 51,228 33,840
New TDRs loans splits         0 20,059
Increases to existing TDRs   367   0 772 0
Charge offs   3,087   0 3,087 0
Paid-off and partial payments   (385)   (632) (760) (1,315)
Ending balance of TDRs   48,153 51,258 52,584 48,153 52,584
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 3,530 4,084   1,579 3,530 473
Charges to the provision for loan losses   (599)   2,198 281 3,304
Amount charged-off   3,087   0 3,087 0
Ending balance   398 4,084 3,777 398 3,777
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [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         (326) 0
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member] | Commercial And Industrial Sector [Member] | Construction Loans [Member]            
Loans And Leases Receivable Disclosure [Abstract]            
Amount charged-off   0   0    
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 1,883 1,892   2,289 1,883 2,431
New TDRs loans splits         0 0
Increases to existing TDRs   0   0 34 0
Charge offs   3,087   0 0 0
Paid-off and partial payments   (288)   (345) (313) (487)
Ending balance of TDRs   1,604 1,892 1,944 1,604 1,944
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 0 0   0 0 0
Charges to the provision for loan losses   0   0 0 0
Amount charged-off         0 0
Ending balance   0 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 22,749 22,599   22,940 22,749 3,003
New TDRs loans splits         0 20,059
Increases to existing TDRs   0   0 0 0
Charge offs   3,087   0 3,087 0
Paid-off and partial payments   (97)   (95) (247) (217)
Ending balance of TDRs   19,415 22,599 22,845 19,415 22,845
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance 3,516 3,646   1,261 3,516 0
Charges to the provision for loan losses   (559)   2,254 (14) 3,515
Amount charged-off   3,087   0 3,087 0
Ending balance   0 3,646 3,515 0 3,515
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         (415) 0
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 26,596 26,767   27,987 26,596 28,406
New TDRs loans splits         0 0
Increases to existing TDRs   367   0 738 0
Charge offs   0   0 0 0
Paid-off and partial payments   0   (192) (200) (611)
Ending balance of TDRs   27,134 26,767 27,795 27,134 27,795
Loans And Leases Receivable Disclosure [Abstract]            
Beginning balance $ 14 438   318 14 473
Charges to the provision for loan losses   (40)   (56) 295 (211)
Amount charged-off   0   0 0 0
Ending balance   $ 398 $ 438 $ 262 398 262
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         $ 89 $ 0