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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

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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