Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Schedule of financial instruments with estimated fair values) (Details)

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FAIR VALUE MEASUREMENTS (Schedule of financial instruments with estimated fair values) (Details) - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
ASSETS:            
Investment Securities, Available for Sale $ 416,745,000   $ 654,611,000      
Investment securities, held to maturity, fair value 623,628,000   339,699,000      
Equity Securities 1,349,000   861,000      
Loans Held for Sale 50,304,000   52,532,000      
Mortgage Servicing Rights 5,695,000 $ 5,086,000 3,774,000 $ 3,564,000 $ 3,710,000 $ 3,452,000
Loans, Net of Allowance for Credit Losses 2,323,675,000   1,909,859,000      
Fair value inputs, Level 1 [Member]            
ASSETS:            
Cash 72,686,000   65,313,000      
Short-Term Investments 497,679,000   970,041,000      
Investment Securities, Held to Maturity 434,717,000   113,877,000      
Equity Securities 0   0      
Other Equity Securities 0   0      
Mortgage Servicing Rights 0   0      
Loans, Net of Allowance for Credit Losses 0   0      
LIABILITIES:            
Deposits 0   0      
Short-Term Borrowings 0   0      
Subordinated Notes Payable 0   0      
Long-Term Borrowings 0   0      
Fair Value, Inputs, Level 2 [Member]            
ASSETS:            
Cash 0   0      
Short-Term Investments 0   0      
Investment Securities, Held to Maturity 188,911,000   225,822,000      
Equity Securities 1,349,000   861,000      
Other Equity Securities 2,848,000   2,848,000      
Mortgage Servicing Rights 0   0      
Loans, Net of Allowance for Credit Losses 0   0      
LIABILITIES:            
Deposits 3,209,190,000   3,713,478,000      
Short-Term Borrowings 51,821,000   34,557,000      
Subordinated Notes Payable 46,532,000   42,609,000      
Long-Term Borrowings 564,000   938,000      
Fair Value, Inputs, Level 3 [Member]            
ASSETS:            
Cash 0   0      
Short-Term Investments 0   0      
Investment Securities, Held to Maturity 0   0      
Equity Securities 0          
Loans Held for Sale     0      
Other Equity Securities 0   0      
Mortgage Servicing Rights 9,441,000   4,718,000      
Loans, Net of Allowance for Credit Losses 2,207,464,000   1,903,640,000      
LIABILITIES:            
Deposits 0   0      
Short-Term Borrowings 0   0      
Subordinated Notes Payable 0   0      
Long-Term Borrowings 0   0      
Carrying (Reported) Amount, Fair Value Disclosure [Member]            
ASSETS:            
Cash 72,686,000   65,313,000      
Short-Term Investments 497,679,000   970,041,000      
Investment Securities, Held to Maturity 676,178,000   339,601,000      
Equity Securities 1,349,000   861,000      
Other Equity Securities 2,848,000   2,848,000      
Mortgage Servicing Rights 5,695,000   3,774,000      
Loans, Net of Allowance for Credit Losses 2,323,675,000   1,909,859,000      
LIABILITIES:            
Deposits 3,759,378,000   3,712,862,000      
Short-Term Borrowings 52,271,000   34,557,000      
Subordinated Notes Payable 52,887,000   52,887,000      
Long-Term Borrowings $ 562,000   $ 884,000