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FAIR VALUE OF ASSETS AND LIABILITIES (Carrying Amount and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets      
Cash and due from financial institutions $ 75,318,000 $ 75,272,000  
Interest-bearing deposits in other financial institutions 6,975,000 9,069,000  
Loans held for sale 16,336,000 31,881,000  
Mortgage servicing rights 15,843,000 15,779,000  
Federal Home Loan Bank stock 7,761,000 11,572,000  
Accrued interest receivable 16,581,000 15,675,000  
Financial liabilities      
Noninterest-bearing demand 1,395,556,000 1,265,246,000  
Time deposits 1,145,868,000 1,089,364,000  
Transfers of financial assets from Level 1 to Level 2 0    
Transfers of financial assets from Level 2 to Level 1 0    
Transfers of financial liabilities from Level 1 to Level 2 0    
Transfers of financial liabilities from Level 2 to Level 1 0    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
Cash and due from financial institutions 75,318,000 75,272,000  
Interest-bearing deposits in other financial institutions 6,975,000 9,069,000  
Investment securities 825,000 660,000  
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group 0 0  
Loans and leases, net of allowance for loan and lease losses 0 0  
Mortgage servicing rights 0 0  
Federal Home Loan Bank stock 7,761,000 11,572,000  
Accrued interest receivable 16,581,000 15,675,000  
Financial liabilities      
Noninterest-bearing demand 1,395,556,000 1,265,246,000  
Interest-bearing demand and savings deposits 2,414,930,000 2,253,591,000  
Time deposits 0 0  
Federal Home Loan Bank advances and other short-term borrowings 0 0  
Long-term debt 0 0  
Accrued interest payable (included in other liabilities) 3,698,000 1,556,000  
Significant Other Observable Inputs (Level 2)      
Financial assets      
Cash and due from financial institutions 0 0  
Interest-bearing deposits in other financial institutions 0 0  
Investment securities 1,481,473,000 1,445,357,000  
Loans held for sale 16,336,000 31,881,000  
Loans and leases, net of allowance for loan and lease losses 21,280,000 30,723,000  
Mortgage servicing rights 0 0  
Federal Home Loan Bank stock 0 0  
Accrued interest receivable 0 0  
Financial liabilities      
Noninterest-bearing demand 0 0  
Interest-bearing demand and savings deposits 0 0  
Time deposits 0 0  
Federal Home Loan Bank advances and other short-term borrowings 32,000,000 135,000,000  
Long-term debt 70,139,000 68,186,000  
Accrued interest payable (included in other liabilities) 0 0  
Significant Unobservable Inputs (Level 3)      
Financial assets      
Cash and due from financial institutions 0 0  
Interest-bearing deposits in other financial institutions 0 0  
Investment securities 11,794,000 12,196,000  
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group 0 0  
Loans and leases, net of allowance for loan and lease losses 3,663,554,000 3,396,253,000  
Federal Home Loan Bank stock 0 0  
Accrued interest receivable 0 0  
Financial liabilities      
Noninterest-bearing demand 0 0  
Interest-bearing demand and savings deposits 0 0  
Time deposits 1,140,064,000 1,088,436,000  
Federal Home Loan Bank advances and other short-term borrowings 0 0  
Long-term debt 0 0  
Accrued interest payable (included in other liabilities) 0 0  
Carrying Amount      
Financial assets      
Cash and due from financial institutions 75,318,000 75,272,000  
Interest-bearing deposits in other financial institutions 6,975,000 9,069,000  
Investment securities 1,496,644,000 1,461,515,000  
Loans held for sale 16,336,000 31,881,000  
Loans and leases, net of allowance for loan and lease losses 3,720,614,000 3,468,259,000  
Mortgage servicing rights   15,779,000  
Federal Home Loan Bank stock   11,572,000  
Accrued interest receivable 16,581,000 15,675,000  
Financial liabilities      
Noninterest-bearing demand 1,395,556,000 1,265,246,000  
Interest-bearing demand and savings deposits 2,414,930,000 2,253,591,000  
Time deposits 1,145,868,000 1,089,364,000  
Federal Home Loan Bank advances and other short-term borrowings 32,000,000 135,000,000  
Long-term debt 92,785,000 92,785,000  
Accrued interest payable (included in other liabilities) 3,698,000 1,556,000  
Estimated Fair Value      
Financial assets      
Cash and due from financial institutions 75,318,000 75,272,000  
Interest-bearing deposits in other financial institutions 6,975,000 9,069,000  
Investment securities 1,494,092,000 1,458,213,000  
Loans held for sale 16,336,000 31,881,000  
Loans and leases, net of allowance for loan and lease losses 3,684,834,000 3,426,976,000  
Mortgage servicing rights 17,161,000 18,087,000  
Federal Home Loan Bank stock 7,761,000 11,572,000  
Accrued interest receivable 16,581,000 15,675,000  
Financial liabilities      
Noninterest-bearing demand 1,395,556,000 1,265,246,000  
Interest-bearing demand and savings deposits 2,414,930,000 2,253,591,000  
Time deposits 1,140,064,000 1,088,436,000  
Federal Home Loan Bank advances and other short-term borrowings 32,000,000 135,000,000  
Long-term debt 70,139,000 68,186,000  
Accrued interest payable (included in other liabilities) 3,698,000 1,556,000  
Commitments to extend credit      
Financial liabilities      
Off-balance sheet financial instruments: 825,304,000    
Commitments to extend credit | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Commitments to extend credit | Significant Other Observable Inputs (Level 2)      
Financial liabilities      
Off-balance sheet financial instruments: 1,140,000 1,046,000  
Commitments to extend credit | Significant Unobservable Inputs (Level 3)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Commitments to extend credit | Carrying Amount      
Financial liabilities      
Off-balance sheet financial instruments: 917,405,000    
Commitments to extend credit | Estimated Fair Value      
Financial liabilities      
Off-balance sheet financial instruments: 1,140,000 1,046,000  
Standby letters of credit and financial guarantees written      
Financial liabilities      
Off-balance sheet financial instruments: 16,073,000    
Standby letters of credit and financial guarantees written | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Standby letters of credit and financial guarantees written | Significant Other Observable Inputs (Level 2)      
Financial liabilities      
Off-balance sheet financial instruments: 203,000 241,000  
Standby letters of credit and financial guarantees written | Significant Unobservable Inputs (Level 3)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Standby letters of credit and financial guarantees written | Carrying Amount      
Financial liabilities      
Off-balance sheet financial instruments: 13,551,000    
Standby letters of credit and financial guarantees written | Estimated Fair Value      
Financial liabilities      
Off-balance sheet financial instruments: 203,000 241,000  
Interest rate options      
Financial liabilities      
Off-balance sheet financial instruments: 2,494,000 879,000  
Interest rate options | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Interest rate options | Significant Other Observable Inputs (Level 2)      
Financial liabilities      
Off-balance sheet financial instruments: 12,000 6,000  
Interest rate options | Significant Unobservable Inputs (Level 3)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Interest rate options | Estimated Fair Value      
Financial liabilities      
Off-balance sheet financial instruments: 12,000 6,000  
Forward interest rate contracts      
Financial liabilities      
Off-balance sheet financial instruments: 18,748,000 32,497,000  
Forward interest rate contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Forward interest rate contracts | Significant Other Observable Inputs (Level 2)      
Financial liabilities      
Off-balance sheet financial instruments: (26,000) 136,000  
Forward interest rate contracts | Significant Unobservable Inputs (Level 3)      
Financial liabilities      
Off-balance sheet financial instruments: 0 0  
Forward interest rate contracts | Estimated Fair Value      
Financial liabilities      
Off-balance sheet financial instruments: (26,000) 136,000  
Mortgage Servicing Rights      
Financial assets      
Finite-lived Intangible Assets, Fair Value Disclosure   18,087,000 $ 18,345,000
Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3)      
Financial assets      
Finite-lived Intangible Assets, Fair Value Disclosure 17,161,000 $ 18,087,000  
Mortgage Servicing Rights | Carrying Amount      
Financial assets      
Mortgage servicing rights $ 15,843,000