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ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year $ 57,650 $ 175,679 $ 57,650
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 61,505   61,505
Provision for Credit Losses   3,450 23,880
Loans charged off   (10,032) (1,849)
Recoveries   826 2,699
Total net charge-offs   (9,206) 850
Balance at end of year 119,155 169,923 143,885
Commercial      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 18,584 51,454 18,584
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,901   9,901
Provision for Credit Losses   1,258 16,016
Loans charged off   (7,910) (1,091)
Recoveries   337 2,000
Total net charge-offs   (7,573) 909
Balance at end of year 28,485 45,139 45,410
Lease financing      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 971 995 971
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 118   118
Provision for Credit Losses   20 405
Loans charged off   0 0
Recoveries   0 0
Total net charge-offs   0 0
Balance at end of year 1,089 1,015 1,494
Construction real estate      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 2,381 21,736 2,381
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 11,579   11,579
Provision for Credit Losses   1,000 (449)
Loans charged off   (2) 0
Recoveries   0 0
Total net charge-offs   (2) 0
Balance at end of year 13,960 22,734 13,511
Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 23,579 76,795 23,579
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 24,118   24,118
Provision for Credit Losses   2,929 5,227
Loans charged off   (1,250) (4)
Recoveries   195 234
Total net charge-offs   (1,055) 230
Balance at end of year 47,697 78,669 53,154
Residential Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 5,299 8,560 5,299
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 5,490   5,490
Provision for Credit Losses   (855) 558
Loans charged off   (1) (115)
Recoveries   44 52
Total net charge-offs   43 (63)
Balance at end of year 10,789 7,748 11,284
Home equity      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 4,787 11,869 4,787
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 8,430   8,430
Provision for Credit Losses   (675) 1,538
Loans charged off   (611) (267)
Recoveries   177 339
Total net charge-offs   (434) 72
Balance at end of year 13,217 10,760 14,827
Installment      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 392 1,215 392
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 801   801
Provision for Credit Losses   22 75
Loans charged off   (36) (61)
Recoveries   34 31
Total net charge-offs   (2) (30)
Balance at end of year 1,193 1,235 1,238
Credit card      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Balance at beginning of year 1,657 3,055 1,657
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,068   1,068
Provision for Credit Losses   (249) 510
Loans charged off   (222) (311)
Recoveries   39 43
Total net charge-offs   183 268
Balance at end of year $ 2,725 $ 2,623 $ 2,967