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FAIR VALUE DISCLOSURES, Assets (Liabilities) Measured at Fair Value on Recurring and Non-Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Securities available for sale [Abstract]        
Securities available for sale $ 698,579 $ 701,711    
Mortgage servicing rights 25,795 27,474 $ 25,425 $ 19,700
State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 231,177 225,055    
Residential Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 327,523 328,845    
Commercial Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 42,667 41,967    
Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 67,551 75,638    
Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 10,992 11,112    
Recurring [Member]        
Securities available for sale [Abstract]        
Asset-backed and other amortizing securities 18,669 19,094    
Loans held for sale (mandatory) 11,576 10,038    
Mortgage servicing rights 25,795 27,474    
Asset derivatives 18,931 21,162    
Liability derivatives (409) (128)    
Recurring [Member] | State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 231,177 225,055    
Recurring [Member] | Residential Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 327,523 328,845    
Recurring [Member] | Commercial Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 42,667 41,967    
Recurring [Member] | Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 67,551 75,638    
Recurring [Member] | Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 10,992 11,112    
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] | Residential Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 0 0    
Recurring [Member] | Level 1 [Member] | Commercial 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 18,669 19,094    
Loans held for sale (mandatory) 11,576 10,038    
Mortgage servicing rights 0 0    
Asset derivatives 18,931 21,162    
Liability derivatives (409) (128)    
Recurring [Member] | Level 2 [Member] | State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 231,177 225,055    
Recurring [Member] | Level 2 [Member] | Residential Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 327,523 328,845    
Recurring [Member] | Level 2 [Member] | Commercial Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 42,667 41,967    
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 67,551 75,638    
Recurring [Member] | Level 2 [Member] | Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 10,992 11,112    
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 25,795 27,474    
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] | Residential Mortgage-backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 0 0    
Recurring [Member] | Level 3 [Member] | Commercial 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]        
Loans held for investment 4,161 4,821    
Non-recurring [Member] | Level 1 [Member]        
Assets measured at fair value on a non-recurring basis [Abstract]        
Loans held for investment 0 0    
Non-recurring [Member] | Level 2 [Member]        
Assets measured at fair value on a non-recurring basis [Abstract]        
Loans held for investment 0 0    
Non-recurring [Member] | Level 3 [Member]        
Assets measured at fair value on a non-recurring basis [Abstract]        
Loans held for investment $ 4,161 $ 4,821