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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, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Securities available for sale [Abstract]        
Securities available for sale $ 793,404 $ 724,504    
Mortgage servicing rights 25,425 19,700 $ 13,558 $ 9,049
U.S. Government and Agencies [Member]        
Securities available for sale [Abstract]        
Securities available for sale 0 0    
State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 253,008 275,672    
Mortgage-Backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 398,433 303,089    
Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 105,019 106,320    
Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 12,409 12,487    
Recurring [Member]        
Securities available for sale [Abstract]        
Asset-backed and other amortizing securities 24,535 26,936    
Loans held for sale (mandatory) 22,323 47,593    
Mortgage servicing rights 25,425 19,700    
Asset derivatives 15,202 7,328    
Liability derivatives (1,238) (535)    
Recurring [Member] | U.S. Government and Agencies [Member]        
Securities available for sale [Abstract]        
Securities available for sale 0 0    
Recurring [Member] | State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 253,008 275,672    
Recurring [Member] | Mortgage-Backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 398,433 303,089    
Recurring [Member] | Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 105,019 106,320    
Recurring [Member] | Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 12,409 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] | U.S. Government and Agencies [Member]        
Securities available for sale [Abstract]        
Securities available for sale 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 24,535 26,936    
Loans held for sale (mandatory) 22,323 47,593    
Mortgage servicing rights 0 0    
Asset derivatives 15,202 7,328    
Liability derivatives (1,238) (535)    
Recurring [Member] | Level 2 [Member] | U.S. Government and Agencies [Member]        
Securities available for sale [Abstract]        
Securities available for sale 0 0    
Recurring [Member] | Level 2 [Member] | State and Municipal [Member]        
Securities available for sale [Abstract]        
Securities available for sale 253,008 275,672    
Recurring [Member] | Level 2 [Member] | Mortgage-Backed Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 398,433 303,089    
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member]        
Securities available for sale [Abstract]        
Securities available for sale 105,019 106,320    
Recurring [Member] | Level 2 [Member] | Other Securities [Member]        
Securities available for sale [Abstract]        
Securities available for sale 12,409 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 25,425 19,700    
Asset derivatives 0 0    
Liability derivatives 0 0    
Recurring [Member] | Level 3 [Member] | U.S. Government and Agencies [Member]        
Securities available for sale [Abstract]        
Securities available for sale 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 6,815 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 $ 6,815 $ 6,427