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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Financial assets          
Cash and due from banks $ 90,080,000 $ 90,080,000 $ 75,272,000    
Interest-bearing deposits in other banks 18,195,000 18,195,000 9,069,000    
Loans held for sale 10,828,000 10,828,000 31,881,000    
Mortgage servicing rights 16,093,000 16,093,000 15,779,000    
Federal Home Loan Bank stock 6,484,000 6,484,000 11,572,000    
Accrued interest receivable 15,434,000 15,434,000 15,675,000    
Deposits:          
Noninterest-bearing deposits 1,383,548,000 1,383,548,000 1,265,246,000    
Time deposits 1,156,659,000 1,156,659,000 1,089,364,000    
Transfers of financial assets from Level 1 to Level 2 0 0      
Transfers of financial assets from Level 2 to Level 1 0 0      
Transfers of financial liabilities from Level 1 to Level 2 0 0      
Transfers of financial liabilities from Level 2 to Level 1 0 0      
Transfers of financial assets out of Level 3 0 0      
Transfers of financial liabilities out of Level 3 0 0      
Carrying Amount          
Financial assets          
Cash and due from banks 90,080,000 90,080,000 75,272,000    
Interest-bearing deposits in other banks 18,195,000 18,195,000 9,069,000    
Investment securities 1,547,777,000 1,547,777,000 1,461,515,000    
Loans held for sale 10,828,000 10,828,000 31,881,000    
Net loans and leases 3,585,153,000 3,585,153,000 3,468,259,000    
Mortgage servicing rights 16,093,000 16,093,000 15,779,000    
Federal Home Loan Bank stock 6,484,000 6,484,000 11,572,000    
Accrued interest receivable 15,434,000 15,434,000 15,675,000    
Deposits:          
Noninterest-bearing deposits 1,383,548,000 1,383,548,000 1,265,246,000    
Interest-bearing demand and savings deposits 2,387,290,000 2,387,290,000 2,253,591,000    
Time deposits 1,156,659,000 1,156,659,000 1,089,364,000    
Short-term debt     135,000,000    
Long-term debt 92,785,000 92,785,000 92,785,000    
Accrued interest payable (included in other liabilities) 2,866,000 2,866,000 1,556,000    
Carrying Amount | Commitments to extend credit          
Deposits:          
Off-balance sheet financial instruments 915,735,000 915,735,000 825,304,000    
Carrying Amount | Standby letters of credit and financial guarantees written          
Deposits:          
Off-balance sheet financial instruments 13,252,000 13,252,000 16,043,000    
Carrying Amount | Interest rate lock commitments          
Deposits:          
Off-balance sheet financial instruments 2,787,000 2,787,000 879,000    
Carrying Amount | Forward sale commitments          
Deposits:          
Off-balance sheet financial instruments 12,443,000 12,443,000 32,497,000    
Estimated Fair Value          
Financial assets          
Cash and due from banks 90,080,000 90,080,000 75,272,000    
Interest-bearing deposits in other banks 18,195,000 18,195,000 9,069,000    
Investment securities 1,545,819,000 1,545,819,000 1,458,213,000    
Loans held for sale 10,828,000 10,828,000 31,881,000    
Net loans and leases 3,576,442,000 3,576,442,000 3,426,976,000    
Mortgage servicing rights 16,777,000 16,777,000 18,087,000    
Federal Home Loan Bank stock 6,484,000 6,484,000 11,572,000    
Accrued interest receivable 15,434,000 15,434,000 15,675,000    
Deposits:          
Noninterest-bearing deposits 1,383,548,000 1,383,548,000 1,265,246,000    
Interest-bearing demand and savings deposits 2,387,290,000 2,387,290,000 2,253,591,000    
Time deposits 1,152,757,000 1,152,757,000 1,088,436,000    
Short-term debt     135,000,000    
Long-term debt 69,353,000 69,353,000 68,186,000    
Accrued interest payable (included in other liabilities) 2,866,000 2,866,000 1,556,000    
Estimated Fair Value | Commitments to extend credit          
Deposits:          
Off-balance sheet financial instruments 1,142,000 1,142,000 1,046,000    
Estimated Fair Value | Standby letters of credit and financial guarantees written          
Deposits:          
Off-balance sheet financial instruments 199,000 199,000 241,000    
Estimated Fair Value | Interest rate lock commitments          
Deposits:          
Off-balance sheet financial instruments (1,000) (1,000) 6,000    
Estimated Fair Value | Forward sale commitments          
Deposits:          
Off-balance sheet financial instruments (6,000) (6,000) 136,000    
Quoted Prices in Active Markets for Identical Assets (Level 1)          
Financial assets          
Cash and due from banks 90,080,000 90,080,000 75,272,000    
Interest-bearing deposits in other banks 18,195,000 18,195,000 9,069,000    
Investment securities 794,000 794,000 660,000    
Loans held for sale 0 0 0    
Net loans and leases 0 0 0    
Mortgage servicing rights 0 0 0    
Federal Home Loan Bank stock 6,484,000 6,484,000 11,572,000    
Accrued interest receivable 15,434,000 15,434,000 15,675,000    
Deposits:          
Noninterest-bearing deposits 1,383,548,000 1,383,548,000 1,265,246,000    
Interest-bearing demand and savings deposits 2,387,290,000 2,387,290,000 2,253,591,000    
Time deposits 0 0 0    
Short-term debt     0    
Long-term debt 0 0 0    
Accrued interest payable (included in other liabilities) 2,866,000 2,866,000 1,556,000    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commitments to extend credit          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Standby letters of credit and financial guarantees written          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate lock commitments          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward sale commitments          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Significant Other Observable Inputs (Level 2)          
Financial assets          
Cash and due from banks 0 0 0    
Interest-bearing deposits in other banks 0 0 0    
Investment securities 1,532,927,000 1,532,927,000 1,445,357,000    
Loans held for sale 10,828,000 10,828,000 31,881,000    
Net loans and leases 25,029,000 25,029,000 30,723,000    
Mortgage servicing rights 0 0 0    
Federal Home Loan Bank stock 0 0 0    
Accrued interest receivable 0 0 0    
Deposits:          
Noninterest-bearing deposits 0 0 0    
Interest-bearing demand and savings deposits 0 0 0    
Time deposits 0 0 0    
Short-term debt     135,000,000    
Long-term debt 69,353,000 69,353,000 68,186,000    
Accrued interest payable (included in other liabilities) 0 0 0    
Significant Other Observable Inputs (Level 2) | Commitments to extend credit          
Deposits:          
Off-balance sheet financial instruments 1,142,000 1,142,000 1,046,000    
Significant Other Observable Inputs (Level 2) | Standby letters of credit and financial guarantees written          
Deposits:          
Off-balance sheet financial instruments 199,000 199,000 241,000    
Significant Other Observable Inputs (Level 2) | Interest rate lock commitments          
Deposits:          
Off-balance sheet financial instruments (1,000) (1,000) 6,000    
Significant Other Observable Inputs (Level 2) | Forward sale commitments          
Deposits:          
Off-balance sheet financial instruments (6,000) (6,000) 136,000    
Significant Unobservable Inputs (Level 3)          
Financial assets          
Cash and due from banks 0 0 0    
Interest-bearing deposits in other banks 0 0 0    
Investment securities 12,098,000 12,098,000 12,196,000    
Loans held for sale 0 0 0    
Net loans and leases 3,551,413,000 3,551,413,000 3,396,253,000    
Mortgage servicing rights     18,087,000    
Federal Home Loan Bank stock 0 0 0    
Accrued interest receivable 0 0 0    
Deposits:          
Noninterest-bearing deposits 0 0 0    
Interest-bearing demand and savings deposits 0 0 0    
Time deposits 1,152,757,000 1,152,757,000 1,088,436,000    
Short-term debt     0    
Long-term debt 0 0 0    
Accrued interest payable (included in other liabilities) 0 0 0    
Significant Unobservable Inputs (Level 3) | Commitments to extend credit          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Significant Unobservable Inputs (Level 3) | Standby letters of credit and financial guarantees written          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Significant Unobservable Inputs (Level 3) | Interest rate lock commitments          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Significant Unobservable Inputs (Level 3) | Forward sale commitments          
Deposits:          
Off-balance sheet financial instruments 0 0 0    
Mortgage Servicing Rights          
Financial assets          
Finite-lived Intangible Assets, Fair Value Disclosure     $ 18,087,000 $ 16,025,000 $ 18,345,000
Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3)          
Financial assets          
Finite-lived Intangible Assets, Fair Value Disclosure $ 16,777,000 $ 16,777,000