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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Credit quality information
Total	$ 2,543,803	$ 2,619,240
Total loans	2,562,885	2,634,593
Total commercial real estate
Credit quality information
Total loans	1,084,381	930,661
Total commercial and industrial
Credit quality information
Total loans	441,069	423,291
Special mention
Credit quality information
Total loans	8,846	16,230
Substandard
Credit quality information
Total loans	35,097	39,442
Loss
Credit quality information
Total loans	1
Non-accrual
Credit quality information
Total loans	12,188	11,550
Total classified
Credit quality information
Total loans	47,286	50,992
Total Criticized
Credit quality information
Total loans	56,132	67,222
Business Activities Loans
Credit quality information
Total loans	1,964,754	1,828,731
Business Activities Loans | Total commercial real estate
Credit quality information
Total loans	895,117	697,438
Business Activities Loans | Total commercial and industrial
Credit quality information
Total loans	371,231	326,570
Business Activities Loans | Residential real estate and consumer
Credit quality information
Total loans	698,406	811,222
Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	694,654	807,224
Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	3,752	3,998
Business Activities Loans | Pass | Total commercial real estate
Credit quality information
Total loans	874,665	677,943
Business Activities Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	354,022	307,129
Business Activities Loans | Special mention
Credit quality information
Total loans	6,604	8,525
Business Activities Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	4,626	5,483
Business Activities Loans | Special mention | Total commercial and industrial
Credit quality information
Total loans	1,978	3,042
Business Activities Loans | Substandard
Credit quality information
Total loans	28,371	26,055
Business Activities Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	15,076	12,304
Business Activities Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	14,596	15,646
Business Activities Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	749	1,708
Business Activities Loans | Doubtful | Total commercial and industrial
Credit quality information
Total loans	633	753
Business Activities Loans | Loss
Credit quality information
Total loans	1
Business Activities Loans | Loss | Total commercial real estate
Credit quality information
Total loans	1
Business Activities Loans | Loss | Total commercial and industrial
Credit quality information
Total loans	2
Business Activities Loans | Non-accrual
Credit quality information
Total loans	6,437	8,354
Business Activities Loans | Total classified
Credit quality information
Total loans	34,809	34,409
Business Activities Loans | Total Criticized
Credit quality information
Total loans	41,413	42,934
Acquired Loans
Credit quality information
Total loans	598,131	805,862
Acquired Loans | Total commercial real estate
Credit quality information
Total loans	189,264	233,223
Acquired Loans | Total commercial and industrial
Credit quality information
Total loans	69,838	96,721
Acquired Loans | Residential real estate and consumer
Credit quality information
Total loans	339,029	475,918
Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	336,310	472,022
Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	2,719	3,896
Acquired Loans | Pass | Total commercial real estate
Credit quality information
Total loans	179,108	220,903
Acquired Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	67,994	88,649
Acquired Loans | Special mention
Credit quality information
Total loans	2,242	7,705
Acquired Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	1,449	2,273
Acquired Loans | Special mention | Total commercial and industrial
Credit quality information
Total loans	793	5,432
Acquired Loans | Substandard
Credit quality information
Total loans	6,726	13,387
Acquired Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	7,191	9,879
Acquired Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	584	2,299
Acquired Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	1,516	168
Acquired Loans | Doubtful | Total commercial and industrial
Credit quality information
Total loans	467	341
Acquired Loans | Non-accrual
Credit quality information
Total loans	5,751	3,196
Acquired Loans | Total classified
Credit quality information
Total loans	12,477	16,583
Acquired Loans | Total Criticized
Credit quality information
Total loans	14,719	24,288
Construction and land development | Total commercial real estate
Credit quality information
Total loans	131,123	34,290
Construction and land development | Business Activities Loans | Total commercial real estate
Credit quality information
Total loans	129,255	31,387
Construction and land development | Business Activities Loans | Pass | Total commercial real estate
Credit quality information
Total loans	129,065	31,057
Construction and land development | Business Activities Loans | Substandard | Total commercial real estate
Credit quality information
Total loans		330
Construction and land development | Business Activities Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	189
Construction and land development | Business Activities Loans | Loss | Total commercial real estate
Credit quality information
Total loans	1
Construction and land development | Acquired Loans | Total commercial real estate
Credit quality information
Total loans	1,868	2,903
Construction and land development | Acquired Loans | Pass | Total commercial real estate
Credit quality information
Total loans	1,703	2,412
Construction and land development | Acquired Loans | Special mention | Total commercial real estate
Credit quality information
Total loans		12
Construction and land development | Acquired Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	165	479
Other commercial real estate | Total commercial real estate
Credit quality information
Total loans	953,258	896,371
Other commercial real estate | Business Activities Loans | Total commercial real estate
Credit quality information
Total loans	765,862	666,051
Other commercial real estate | Business Activities Loans | Pass | Total commercial real estate
Credit quality information
Total loans	745,600	646,886
Other commercial real estate | Business Activities Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	4,626	5,483
Other commercial real estate | Business Activities Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	15,076	11,974
Other commercial real estate | Business Activities Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	560	1,708
Other commercial real estate | Acquired Loans | Total commercial real estate
Credit quality information
Total loans	187,396	230,320
Other commercial real estate | Acquired Loans | Pass | Total commercial real estate
Credit quality information
Total loans	177,405	218,491
Other commercial real estate | Acquired Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	1,449	2,261
Other commercial real estate | Acquired Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	7,026	9,400
Other commercial real estate | Acquired Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	1,516	168
Commercial | Total commercial and industrial
Credit quality information
Total loans	360,688	298,764
Commercial | Business Activities Loans | Total commercial and industrial
Credit quality information
Total loans	315,005	239,692
Commercial | Business Activities Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	298,568	221,329
Commercial | Business Activities Loans | Special mention | Total commercial and industrial
Credit quality information
Total loans	1,644	2,744
Commercial | Business Activities Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	14,158	14,866
Commercial | Business Activities Loans | Doubtful | Total commercial and industrial
Credit quality information
Total loans	633	753
Commercial | Business Activities Loans | Loss | Total commercial and industrial
Credit quality information
Total loans	2
Commercial | Acquired Loans | Total commercial and industrial
Credit quality information
Total loans	45,683	59,072
Commercial | Acquired Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	43,972	51,184
Commercial | Acquired Loans | Special mention | Total commercial and industrial
Credit quality information
Total loans	793	5,432
Commercial | Acquired Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	451	2,115
Commercial | Acquired Loans | Doubtful | Total commercial and industrial
Credit quality information
Total loans	467	341
Agricultural | Total commercial and industrial
Credit quality information
Total loans	16,950	20,224
Agricultural | Business Activities Loans | Total commercial and industrial
Credit quality information
Total loans	16,797	20,018
Agricultural | Business Activities Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	16,025	18,940
Agricultural | Business Activities Loans | Special mention | Total commercial and industrial
Credit quality information
Total loans	334	298
Agricultural | Business Activities Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	438	780
Agricultural | Acquired Loans | Total commercial and industrial
Credit quality information
Total loans	153	206
Agricultural | Acquired Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	20	58
Agricultural | Acquired Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans	133	148
Tax exempt | Total commercial and industrial
Credit quality information
Total loans	63,431	104,303
Tax exempt | Business Activities Loans | Total commercial and industrial
Credit quality information
Total loans	39,429	66,860
Tax exempt | Business Activities Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	39,429	66,860
Tax exempt | Acquired Loans | Total commercial and industrial
Credit quality information
Total loans	24,002	37,443
Tax exempt | Acquired Loans | Pass | Total commercial and industrial
Credit quality information
Total loans	24,002	37,407
Tax exempt | Acquired Loans | Substandard | Total commercial and industrial
Credit quality information
Total loans		36
Residential mortgages | Business Activities Loans | Residential real estate and consumer
Credit quality information
Total loans	633,390	740,687
Residential mortgages | Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	630,089	737,325
Residential mortgages | Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	3,301	3,362
Residential mortgages | Acquired Loans | Residential real estate and consumer
Credit quality information
Total loans	290,501	411,170
Residential mortgages | Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	288,073	407,811
Residential mortgages | Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	2,428	3,359
Home equity | Business Activities Loans | Residential real estate and consumer
Credit quality information
Total loans	55,092	59,368
Home equity | Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	54,654	58,753
Home equity | Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	438	615
Home equity | Acquired Loans | Residential real estate and consumer
Credit quality information
Total loans	47,372	63,033
Home equity | Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	47,081	62,504
Home equity | Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	291	529
Other consumer | Business Activities Loans | Residential real estate and consumer
Credit quality information
Total loans	9,924	11,167
Other consumer | Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	9,911	11,146
Other consumer | Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	13	21
Other consumer | Acquired Loans | Residential real estate and consumer
Credit quality information
Total loans	1,156	1,715
Other consumer | Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	$ 1,156	1,707
Other consumer | Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans		$ 8

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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