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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Allowance for loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses      
Beginning balance $ 50,652 $ 48,453 $ 47,121
Provision for loan losses 14,770 3,235 6,400
Loans charged-off (5,253) (1,910) (6,111)
Recoveries 1,239 874 1,043
Net loans (charged-off) recovered (4,014) (1,036) (5,068)
Ending balance 61,408 50,652 48,453
Commercial and Industrial Loans [Member]      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 25,789 22,518 21,097
Provision for loan losses 6,640 4,259 5,884
Loans charged-off (4,524) (1,447) (5,215)
Recoveries 428 459 752
Net loans (charged-off) recovered (4,096) (988) (4,463)
Ending balance 28,333 25,789 22,518
Commercial Real Estate and Multi-family Residential Loans      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 15,796 15,393 14,714
Provision for loan losses 6,868 259 1,140
Loans charged-off (72) (17) (491)
Recoveries 315 161 30
Net loans (charged-off) recovered 243 144 (461)
Ending balance 22,907 15,796 15,393
Agri-business and Agricultural Loans [Member]      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 3,869 4,305 4,920
Provision for loan losses (826) (444) (657)
Loans charged-off 0 0 0
Recoveries 0 8 42
Net loans (charged-off) recovered 0 8 42
Ending balance 3,043 3,869 4,305
Other Commercial      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 447 368 577
Provision for loan losses (31) 79 (209)
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans (charged-off) recovered 0 0 0
Ending balance 416 447 368
Consumer 1-4 Family Mortgage Loans [Member]      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 2,086 2,292 2,768
Provision for loan losses 341 (219) (536)
Loans charged-off (141) (110) (48)
Recoveries 333 123 108
Net loans (charged-off) recovered 192 13 60
Ending balance 2,619 2,086 2,292
Other Consumer      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 345 283 379
Provision for loan losses 959 275 150
Loans charged-off (516) (336) (357)
Recoveries 163 123 111
Net loans (charged-off) recovered (353) (213) (246)
Ending balance 951 345 283
Unallocated      
Financing Receivable, Allowance for Credit Losses      
Beginning balance 2,320 3,294 2,666
Provision for loan losses 819 (974) 628
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans (charged-off) recovered 0 0 0
Ending balance $ 3,139 $ 2,320 $ 3,294