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ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year $ 57,650 $ 169,923 $ 143,885 $ 175,679 $ 57,650
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 61,505       61,505
Provision for Credit Losses   (4,756) 17,859 (1,306) 41,739
Loans charged off   (6,312) (4,136) (16,344) (5,985)
Recoveries   735 1,053 1,561 3,752
Total net charge-offs   (5,577) (3,083) (14,783) (2,233)
Balance at end of year 119,155 159,590 158,661 159,590 158,661
Commercial          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 18,584 45,139 45,410 51,454 18,584
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,901       9,901
Provision for Credit Losses   5,182 6,018 6,440 22,034
Loans charged off   (3,729) (1,282) (11,639) (2,373)
Recoveries   205 275 542 2,275
Total net charge-offs   (3,524) (1,007) (11,097) (98)
Balance at end of year 28,485 46,797 50,421 46,797 50,421
Lease financing          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 971 1,015 1,494 995 971
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 118       118
Provision for Credit Losses   442 (63) 462 342
Loans charged off   0 0 0 0
Recoveries   0 0 0 0
Total net charge-offs   0 0 0 0
Balance at end of year 1,089 1,457 1,431 1,457 1,431
Construction real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 2,381 22,734 13,511 21,736 2,381
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 11,579       11,579
Provision for Credit Losses   (2,378) 1,832 (1,378) 1,383
Loans charged off   0 0 (2) 0
Recoveries   3 14 3 14
Total net charge-offs   3 14 1 14
Balance at end of year 13,960 20,359 15,357 20,359 15,357
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 23,579 78,669 53,154 76,795 23,579
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 24,118       24,118
Provision for Credit Losses   (6,398) 10,799 (3,469) 16,026
Loans charged off   (2,041) (2,037) (3,291) (2,041)
Recoveries   75 424 270 658
Total net charge-offs   (1,966) (1,613) (3,021) (1,383)
Balance at end of year 47,697 70,305 62,340 70,305 62,340
Residential Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 5,299 7,748 11,284 8,560 5,299
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 5,490       5,490
Provision for Credit Losses   (877) (648) (1,732) (90)
Loans charged off   (46) (148) (47) (263)
Recoveries   54 93 98 145
Total net charge-offs   8 (55) 51 (118)
Balance at end of year 10,789 6,879 10,581 6,879 10,581
Home equity          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 4,787 10,760 14,827 11,869 4,787
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 8,430       8,430
Provision for Credit Losses   (1,153) (319) (1,828) 1,219
Loans charged off   (240) (428) (851) (695)
Recoveries   317 156 494 495
Total net charge-offs   77 (272) (357) (200)
Balance at end of year 13,217 9,684 14,236 9,684 14,236
Installment          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 392 1,235 1,238 1,215 392
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 801       801
Provision for Credit Losses   16 (32) 38 43
Loans charged off   (77) (7) (113) (68)
Recoveries   37 27 71 58
Total net charge-offs   (40) 20 (42) (10)
Balance at end of year 1,193 1,211 1,226 1,211 1,226
Credit card          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 1,657 2,623 2,967 3,055 1,657
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,068       1,068
Provision for Credit Losses   410 272 161 782
Loans charged off   (179) (234) (401) (545)
Recoveries   44 64 83 107
Total net charge-offs   135 170 318 438
Balance at end of year $ 2,725 $ 2,898 $ 3,069 $ 2,898 $ 3,069