LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Past Due Status (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accruing Interest
Accruing Interest	$ 2,446,662	$ 2,495,258
Nonaccrual	3,248	2,763
Total	2,451,826	2,499,689
30 - 89 Days Past Due
Accruing Interest
Accruing Interest	1,711	1,620
90+ Days Past Due
Accruing Interest
Accruing Interest	205	48
Commercial and industrial
Accruing Interest
Accruing Interest	249,547	286,563
Nonaccrual	89	374
Total	249,839	286,946
Commercial and industrial | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest	21	9
Commercial and industrial | 90+ Days Past Due
Accruing Interest
Accruing Interest	182
Agricultural and farmland
Accruing Interest
Accruing Interest	229,878	247,772
Total	230,370	247,796
Agricultural and farmland | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest	492	24
Commercial real estate - owner occupied
Accruing Interest
Accruing Interest	228,997	234,441
Total	228,997	234,544
Commercial real estate - owner occupied | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest		103
Commercial real estate - non-owner occupied
Accruing Interest
Accruing Interest	655,089	683,029
Nonaccrual	1,004	171
Total	656,093	684,023
Commercial real estate - non-owner occupied | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest		823
Multi-family
Accruing Interest
Accruing Interest	269,452	263,911
Total	269,452	263,911
Construction and land development
Accruing Interest
Accruing Interest	331,393	297,465
Nonaccrual	517	519
Total	332,041	298,048
Construction and land development | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest	131	64
One-to-four family residential
Accruing Interest
Accruing Interest	322,580	325,780
Nonaccrual	1,575	1,642
Total	325,047	327,837
One-to-four family residential | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest	869	383
One-to-four family residential | 90+ Days Past Due
Accruing Interest
Accruing Interest	23	32
Municipal, consumer, and other
Accruing Interest
Accruing Interest	159,726	156,297
Nonaccrual	63	57
Total	159,987	156,584
Municipal, consumer, and other | 30 - 89 Days Past Due
Accruing Interest
Accruing Interest	$ 198	214
Municipal, consumer, and other | 90+ Days Past Due
Accruing Interest
Accruing Interest		$ 16