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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Bank impaired loans |  |  |
With no related allowance recorded, Recorded investment | $ 34,278 | $ 50,665 | $ 39,245
With an allowance recorded, Recorded investment | 5,965 | 5,286 | 4,152
Recorded investment, Total | 40,243 | 55,951 | 43,397
With no related allowance recorded, unpaid principal balance | 34,278 | 50,665 | 39,245
With an allowance recorded, unpaid principal balance | 5,965 | 5,286 | 4,152
Unpaid principal balance, Total | 40,243 | 55,951 | 43,397
With an allowance recorded, Related allowance | 1,261 | 1,033 | 1,115
With no related allowance recorded, Average recorded investment | 36,763 | 54,865 | 49,157
With an allowance recorded, Average recorded investment | 5,059 | 4,709 | 4,143
Average recorded investment, Total | 41,822 | 59,574 | 53,300
With no related allowance recorded, Interest income recognized | 392 | 806 | 2,658
With an allowance recorded, Interest income recognized | 70 | 42 | 177
Interest income recognized, Total | 462 | 848 | 2,835
Commercial/agriculture real estate |  |  |
Bank impaired loans |  |  |
With no related allowance recorded, Recorded investment | 19,714 | 33,959 | 24,013
With an allowance recorded, Recorded investment | 5,234 | 2,511 | 2,290
Recorded investment, Total | 24,948 | 36,470 | 26,303
With no related allowance recorded, unpaid principal balance | 19,714 | 33,959 | 24,013
With an allowance recorded, unpaid principal balance | 5,234 | 2,511 | 2,290
Unpaid principal balance, Total | 24,948 | 36,470 | 26,303
With an allowance recorded, Related allowance | 1,094 | 733 | 698
With no related allowance recorded, Average recorded investment | 21,864 | 37,237 | 32,264
With an allowance recorded, Average recorded investment | 3,762 | 2,327 | 2,217
Average recorded investment, Total | 25,626 | 39,564 | 34,481
With no related allowance recorded, Interest income recognized | 239 | 563 | 1,894
With an allowance recorded, Interest income recognized | 62 | 6 | 100
Interest income recognized, Total | 301 | 569 | 1,994
C&I/Agricultural operating |  |  |
Bank impaired loans |  |  |
With no related allowance recorded, Recorded investment | 6,118 | 8,343 | 6,334
With an allowance recorded, Recorded investment | 79 | 416 | 781
Recorded investment, Total | 6,197 | 8,759 | 7,115
With no related allowance recorded, unpaid principal balance | 6,118 | 8,343 | 6,334
With an allowance recorded, unpaid principal balance | 79 | 416 | 781
Unpaid principal balance, Total | 6,197 | 8,759 | 7,115
With an allowance recorded, Related allowance | 10 | 92 | 190
With no related allowance recorded, Average recorded investment | 6,226 | 8,910 | 7,906
With an allowance recorded, Average recorded investment | 430 | 453 | 636
Average recorded investment, Total | 6,656 | 9,363 | 8,542
With no related allowance recorded, Interest income recognized | 70 | 119 | 284
With an allowance recorded, Interest income recognized | 0 | 5 | 22
Interest income recognized, Total | 70 | 124 | 306
Residential mortgage |  |  |
Bank impaired loans |  |  |
With no related allowance recorded, Recorded investment | 8,191 | 7,966 | 8,542
With an allowance recorded, Recorded investment | 652 | 2,260 | 1,079
Recorded investment, Total | 8,843 | 10,226 | 9,621
With no related allowance recorded, unpaid principal balance | 8,191 | 7,966 | 8,542
With an allowance recorded, unpaid principal balance | 652 | 2,260 | 1,079
Unpaid principal balance, Total | 8,843 | 10,226 | 9,621
With an allowance recorded, Related allowance | 157 | 181 | 226
With no related allowance recorded, Average recorded investment | 8,367 | 8,330 | 8,619
With an allowance recorded, Average recorded investment | 866 | 1,846 | 1,255
Average recorded investment, Total | 9,233 | 10,176 | 9,874
With no related allowance recorded, Interest income recognized | 80 | 116 | 450
With an allowance recorded, Interest income recognized | 8 | 30 | 54
Interest income recognized, Total | 88 | 146 | 504
Consumer installment |  |  |
Bank impaired loans |  |  |
With no related allowance recorded, Recorded investment | 255 | 397 | 356
With an allowance recorded, Recorded investment | 0 | 99 | 2
Recorded investment, Total | 255 | 496 | 358
With no related allowance recorded, unpaid principal balance | 255 | 397 | 356
With an allowance recorded, unpaid principal balance | 0 | 99 | 2
Unpaid principal balance, Total | 255 | 496 | 358
With an allowance recorded, Related allowance | 0 | 27 | 1
With no related allowance recorded, Average recorded investment | 306 | 388 | 368
With an allowance recorded, Average recorded investment | 1 | 83 | 35
Average recorded investment, Total | 307 | 471 | 403
With no related allowance recorded, Interest income recognized | 3 | 8 | 30
With an allowance recorded, Interest income recognized | 0 | 1 | 1
Interest income recognized, Total | $ 3 | $ 9 | $ 31

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