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FAIR VALUE DISCLOSURES, Assets (Liabilities) Measured at Fair Value on Recurring and Non-Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Securities available for sale [Abstract]            
Securities available for sale $ 763,943   $ 724,504      
Mortgage servicing rights 27,505 $ 25,425 19,700 $ 15,977 $ 13,558 $ 9,049
State and Municipal [Member]            
Securities available for sale [Abstract]            
Securities available for sale 233,938   275,672      
Mortgage-Backed Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 409,262   303,089      
Collateralized Mortgage Obligations [Member]            
Securities available for sale [Abstract]            
Securities available for sale 87,115   106,320      
Other Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 11,558   12,487      
Recurring [Member]            
Securities available for sale [Abstract]            
Asset-backed and other amortizing securities 22,070   26,936      
Loans held for sale (mandatory) 26,448   47,593      
Mortgage servicing rights 27,505   19,700      
Asset derivatives 17,824   7,328      
Liability derivatives (1,038)   (535)      
Recurring [Member] | State and Municipal [Member]            
Securities available for sale [Abstract]            
Securities available for sale 233,938   275,672      
Recurring [Member] | Mortgage-Backed Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 409,262   303,089      
Recurring [Member] | Collateralized Mortgage Obligations [Member]            
Securities available for sale [Abstract]            
Securities available for sale 87,115   106,320      
Recurring [Member] | Other Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 11,558   12,487      
Recurring [Member] | Level 1 [Member]            
Securities available for sale [Abstract]            
Asset-backed and other amortizing securities 0   0      
Loans held for sale (mandatory) 0   0      
Mortgage servicing rights 0   0      
Asset derivatives 0   0      
Liability derivatives 0   0      
Recurring [Member] | Level 1 [Member] | State and Municipal [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 1 [Member] | Mortgage-Backed Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 1 [Member] | Collateralized Mortgage Obligations [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 1 [Member] | Other Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 2 [Member]            
Securities available for sale [Abstract]            
Asset-backed and other amortizing securities 22,070   26,936      
Loans held for sale (mandatory) 26,448   47,593      
Mortgage servicing rights 0   0      
Asset derivatives 17,824   7,328      
Liability derivatives (1,038)   (535)      
Recurring [Member] | Level 2 [Member] | State and Municipal [Member]            
Securities available for sale [Abstract]            
Securities available for sale 233,938   275,672      
Recurring [Member] | Level 2 [Member] | Mortgage-Backed Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 409,262   303,089      
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member]            
Securities available for sale [Abstract]            
Securities available for sale 87,115   106,320      
Recurring [Member] | Level 2 [Member] | Other Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 11,558   12,487      
Recurring [Member] | Level 3 [Member]            
Securities available for sale [Abstract]            
Asset-backed and other amortizing securities 0   0      
Loans held for sale (mandatory) 0   0      
Mortgage servicing rights 27,505   19,700      
Asset derivatives 0   0      
Liability derivatives 0   0      
Recurring [Member] | Level 3 [Member] | State and Municipal [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 3 [Member] | Mortgage-Backed Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 3 [Member] | Collateralized Mortgage Obligations [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Recurring [Member] | Level 3 [Member] | Other Securities [Member]            
Securities available for sale [Abstract]            
Securities available for sale 0   0      
Non-recurring [Member]            
Assets measured at fair value on a non-recurring basis [Abstract]            
Impaired loans 5,212   6,427      
Non-recurring [Member] | Level 1 [Member]            
Assets measured at fair value on a non-recurring basis [Abstract]            
Impaired loans 0   0      
Non-recurring [Member] | Level 2 [Member]            
Assets measured at fair value on a non-recurring basis [Abstract]            
Impaired loans 0   0      
Non-recurring [Member] | Level 3 [Member]            
Assets measured at fair value on a non-recurring basis [Abstract]            
Impaired loans $ 5,212   $ 6,427