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ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year $ 57,650 $ 159,590 $ 158,661 $ 175,679 $ 57,650
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 61,505       61,505
Provision for Credit Losses-loans and leases   (8,193) 15,299 (9,499) 57,038
Loans charged off   (4,188) (6,820) (20,532) (12,805)
Recoveries   1,694 1,404 3,255 5,156
Total net charge-offs   (2,494) (5,416) (17,277) (7,649)
Balance at end of year 119,155 148,903 168,544 148,903 168,544
Commercial          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 18,584 46,797 50,421 51,454 18,584
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,901       9,901
Provision for Credit Losses-loans and leases   (1,515) 1,297 4,925 23,331
Loans charged off   (2,617) (1,467) (14,256) (3,840)
Recoveries   869 265 1,411 2,540
Total net charge-offs   (1,748) (1,202) (12,845) (1,300)
Balance at end of year 28,485 43,534 50,516 43,534 50,516
Lease financing          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 971 1,457 1,431 995 971
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 118       118
Provision for Credit Losses-loans and leases   (374) 702 88 1,044
Loans charged off   0 (852) 0 (852)
Recoveries   0 6 0 6
Total net charge-offs   0 (846) 0 (846)
Balance at end of year 1,089 1,083 1,287 1,083 1,287
Construction real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 2,381 20,359 15,357 21,736 2,381
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 11,579       11,579
Provision for Credit Losses-loans and leases   (4,969) 3,613 (6,347) 4,996
Loans charged off   0 0 (2) 0
Recoveries   0 0 3 14
Total net charge-offs   0 0 1 14
Balance at end of year 13,960 15,390 18,970 15,390 18,970
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 23,579 70,305 62,340 76,795 23,579
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 24,118       24,118
Provision for Credit Losses-loans and leases   (904) 12,896 (4,373) 28,922
Loans charged off   (1,030) (3,789) (4,321) (5,830)
Recoveries   223 760 493 1,418
Total net charge-offs   (807) (3,029) (3,828) (4,412)
Balance at end of year 47,697 68,594 72,207 68,594 72,207
Residential Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 5,299 6,879 10,581 8,560 5,299
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 5,490       5,490
Provision for Credit Losses-loans and leases   (381) (1,364) (2,113) (1,454)
Loans charged off   (74) (22) (121) (285)
Recoveries   56 91 154 236
Total net charge-offs   (18) 69 33 (49)
Balance at end of year 10,789 6,480 9,286 6,480 9,286
Home equity          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 4,787 9,684 14,236 11,869 4,787
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 8,430       8,430
Provision for Credit Losses-loans and leases   (372) (1,455) (2,200) (236)
Loans charged off   (200) (460) (1,051) (1,155)
Recoveries   426 209 920 704
Total net charge-offs   226 (251) (131) (451)
Balance at end of year 13,217 9,538 12,530 9,538 12,530
Installment          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 392 1,211 1,226 1,215 392
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 801       801
Provision for Credit Losses-loans and leases   (50) 35 (12) 78
Loans charged off   (37) (59) (150) (127)
Recoveries   53 35 124 93
Total net charge-offs   16 (24) (26) (34)
Balance at end of year 1,193 1,177 1,237 1,177 1,237
Credit card          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Balance at beginning of year 1,657 2,898 3,069 3,055 1,657
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,068       1,068
Provision for Credit Losses-loans and leases   372 (425) 533 357
Loans charged off   (230) (171) (631) (716)
Recoveries   67 38 150 145
Total net charge-offs   163 133 481 571
Balance at end of year $ 2,725 $ 3,107 $ 2,511 $ 3,107 $ 2,511