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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Cash and due from banks $ 23,325 $ 25,589
Federal funds sold and overnight interest-bearing deposits 39,553 406
Certificates of deposit in other banks 3,460 1,000
Investment in available-for-sale securities 226,542 214,512
Mortgage servicing rights 2,713 2,584
Accrued interest receivable 5,627 5,183
Deposits:    
Non-interest bearing demand 245,380 235,975
Savings, interest checking and money market 584,468 468,731
Time deposits 295,964  
Accrued interest payable 554 498
Carrying Amount    
Assets:    
Cash and due from banks 23,325 25,589
Federal funds sold and overnight interest-bearing deposits 39,553 406
Certificates of deposit in other banks 3,460 1,000
Investment in available-for-sale securities 226,542 214,512
Loans, net 1,057,580 964,143
Investment in FHLB stock 6,390 5,149
Mortgage servicing rights 2,713 2,584
Cash surrender value - life insurance 2,484 2,409
Accrued interest receivable 5,627 5,183
Assets, Total 1,367,674 1,220,975
Deposits:    
Non-interest bearing demand 245,380 235,975
Savings, interest checking and money market 584,468 468,731
Time deposits 295,964 305,960
Federal funds purchased and securities sold under agreements to repurchase 27,560 31,015
Subordinated notes 49,486 49,486
Other borrowings 121,382 93,392
Accrued interest payable 554 498
Liabilities, Fair Value Disclosure, Total 1,324,794 1,185,057
Fair Value    
Assets:    
Cash and due from banks 23,325 25,589
Federal funds sold and overnight interest-bearing deposits 39,553 406
Certificates of deposit in other banks 3,460 1,000
Investment in available-for-sale securities 226,542 214,512
Loans, net 1,058,153 959,929
Investment in FHLB stock 6,390 5,149
Mortgage servicing rights 2,713 2,584
Cash surrender value - life insurance 2,484 2,409
Accrued interest receivable 5,627 5,183
Assets, Total 1,368,247 1,216,761
Deposits:    
Non-interest bearing demand 245,380 235,975
Savings, interest checking and money market 584,468 468,731
Time deposits 294,778 304,334
Federal funds purchased and securities sold under agreements to repurchase 27,560 31,015
Subordinated notes 39,692 33,712
Other borrowings 121,291 93,209
Accrued interest payable 554 498
Liabilities, Fair Value Disclosure, Total 1,313,723 1,167,474
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and due from banks 23,325 25,589
Federal funds sold and overnight interest-bearing deposits 39,553 406
Certificates of deposit in other banks 3,460 1,000
Investment in available-for-sale securities 1,980 0
Loans, net 0 0
Investment in FHLB stock 0 0
Mortgage servicing rights 0 0
Cash surrender value - life insurance 0 0
Accrued interest receivable 5,627 5,183
Assets, Total 73,945 32,178
Deposits:    
Non-interest bearing demand 245,380 235,975
Savings, interest checking and money market 584,468 468,731
Time deposits 0 0
Federal funds purchased and securities sold under agreements to repurchase 27,560 31,015
Subordinated notes 0 0
Other borrowings 0 0
Accrued interest payable 554 498
Liabilities, Fair Value Disclosure, Total 857,962 736,219
Fair Value | Other Observable Inputs (Level 2)    
Assets:    
Cash and due from banks 0 0
Federal funds sold and overnight interest-bearing deposits 0 0
Certificates of deposit in other banks 0 0
Investment in available-for-sale securities 224,562 214,512
Loans, net 0 0
Investment in FHLB stock 6,390 5,149
Mortgage servicing rights 0 0
Cash surrender value - life insurance 2,484 2,409
Accrued interest receivable 0 0
Assets, Total 233,436 222,070
Deposits:    
Non-interest bearing demand 0 0
Savings, interest checking and money market 0 0
Time deposits 0 0
Federal funds purchased and securities sold under agreements to repurchase 0 0
Subordinated notes 39,692 33,712
Other borrowings 121,291 93,209
Accrued interest payable 0 0
Liabilities, Fair Value Disclosure, Total 160,983 126,921
Fair Value | Net Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and due from banks 0 0
Federal funds sold and overnight interest-bearing deposits 0 0
Certificates of deposit in other banks 0 0
Investment in available-for-sale securities 0 0
Loans, net 1,058,153 959,929
Investment in FHLB stock 0 0
Mortgage servicing rights 2,713 2,584
Cash surrender value - life insurance 0 0
Accrued interest receivable 0 0
Assets, Total 1,060,866 962,513
Deposits:    
Non-interest bearing demand 0 0
Savings, interest checking and money market 0 0
Time deposits 294,778 304,334
Federal funds purchased and securities sold under agreements to repurchase 0 0
Subordinated notes 0 0
Other borrowings 0 0
Accrued interest payable 0 0
Liabilities, Fair Value Disclosure, Total $ 294,778 $ 304,334