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ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses for the Previous Three Years (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for loan and lease losses        
Balance at beginning of year $ 57,650 $ 57,650 $ 56,542 $ 54,021
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 61,505 61,505    
Provision for loan and lease losses   70,796 30,598 14,586
Loans charged off   (21,359) (35,565) (20,670)
Recoveries   7,087 6,075 8,605
Total net charge-offs   14,272 29,490 12,065
Balance at end of year 119,155 175,679 57,650 56,542
Commercial & Industrial        
Allowance for loan and lease losses        
Balance at beginning of year 18,584 18,584 18,746 17,598
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,901 9,901    
Provision for loan and lease losses   25,407 23,631 10,615
Loans charged off   (5,345) 26,676 (11,533)
Recoveries   2,907 2,883 2,066
Total net charge-offs   2,438 23,793 9,467
Balance at end of year 28,485 51,454 18,584 18,746
Lease financing        
Allowance for loan and lease losses        
Balance at beginning of year 971 971 1,130 675
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 118 118    
Provision for loan and lease losses   758 3 454
Loans charged off   (852) 162 0
Recoveries   0 0 1
Total net charge-offs   852 162 (1)
Balance at end of year 1,089 995 971 1,130
Construction real estate        
Allowance for loan and lease losses        
Balance at beginning of year 2,381 2,381 3,413 3,577
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 11,579 11,579    
Provision for loan and lease losses   7,759 (1,100) (310)
Loans charged off   0 0 0
Recoveries   17 68 146
Total net charge-offs   (17) (68) (146)
Balance at end of year 13,960 21,736 2,381 3,413
Commercial real estate        
Allowance for loan and lease losses        
Balance at beginning of year 23,579 23,579 21,048 20,930
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 24,118 24,118    
Provision for loan and lease losses   38,936 5,107 847
Loans charged off   (12,100) 3,689 (4,835)
Recoveries   2,262 1,113 4,106
Total net charge-offs   9,838 2,576 729
Balance at end of year 47,697 76,795 23,579 21,048
Residential        
Allowance for loan and lease losses        
Balance at beginning of year 5,299 5,299 4,964 4,683
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 5,490 5,490    
Provision for loan and lease losses   (2,122) 739 492
Loans charged off   (488) 677 (422)
Recoveries   381 273 211
Total net charge-offs   107 404 211
Balance at end of year 10,789 8,560 5,299 4,964
Home equity        
Allowance for loan and lease losses        
Balance at beginning of year 4,787 4,787 5,348 4,935
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 8,430 8,430    
Provision for loan and lease losses   (939) 695 829
Loans charged off   (1,541) (2,591) (1,725)
Recoveries   1,132 1,335 1,309
Total net charge-offs   409 1,256 416
Balance at end of year 13,217 11,869 4,787 5,348
Installment        
Allowance for loan and lease losses        
Balance at beginning of year 392 392 362 307
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 801 801    
Provision for loan and lease losses   12 2 (85)
Loans charged off   (148) (223) (435)
Recoveries   158 251 575
Total net charge-offs   (10) (28) (140)
Balance at end of year 1,193 1,215 392 362
Credit card        
Allowance for loan and lease losses        
Balance at beginning of year 1,657 1,657 1,531 1,316
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,068 1,068    
Provision for loan and lease losses   985 1,521 1,744
Loans charged off   (885) 1,547 (1,720)
Recoveries   230 152 191
Total net charge-offs   655 1,395 1,529
Balance at end of year $ 2,725 $ 3,055 $ 1,657 $ 1,531