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Fair Value Disclosures (Fair Value by Balance Sheet Groupings) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Financial assets:        
Cash and cash equivalents, carrying amount $ 61,322 $ 52,539 $ 77,517 $ 60,899
Securities available-for-sale, carrying amount 127,961 126,005    
Securities held-to-maturity, carrying amount 41,885 37,778    
Loans held for sale, carrying amount 3,429 2,194    
Loans and leases receivable, net amount, carrying amount 1,544,852 1,482,832    
Cash surrender value of life insurance, carrying amount 40,614 40,323    
Federal Home Loan Bank and Federal Reserve Bank stock, carrying amount 8,650 5,670    
Accrued interest receivable, carrying amount 5,403 5,019    
Interest rate swaps - assets, carrying amount 1,511 942    
Cash and cash equivalents, fair value 61,319 52,539    
Securities available-for-sale, fair value 127,961 126,005    
Held-to-maturity Securities, fair value 41,409 37,696    
Loans Held-for-sale, Fair Value Disclosure 3,772 2,413    
Loans and lease receivables, net, fair value 1,541,857 1,482,664    
Accrued interest receivable, fair value 5,403 5,019    
Interest rate swaps - assets, fair value 1,511 942    
Financial liabilities:        
Deposits, carrying amount 1,371,158 1,394,331    
Federal Home Loan Bank and other borrowings, carrying amount 308,912 207,898    
Junior subordinated notes, carrying amount 10,022 10,019    
Accrued interest payable, carrying amount 2,456 2,095    
Standby letters of credit, carrying amount 52 75    
Deposits, fair value 1,367,168 1,391,801    
Federal Home Loan Bank and other borrowings fair value 305,156 206,441    
Junior subordinated notes, fair value 8,352 8,836    
Accrued interest payable, fair value 2,456 2,095    
Standby letters of credit, fair value 52 75    
Liabilities, Fair Value Disclosure, Recurring 961 1,064    
Interest Rate Derivative Instruments, Both Hedging and Not Designated as Hedging, Liability at Fair Value, Fair Value Disclosure 961 1,064    
Fair Value Measurements - Level 1 Inputs        
Financial assets:        
Cash and cash equivalents, fair value 41,622 35,114    
Securities available-for-sale, fair value 0 0    
Held-to-maturity Securities, fair value 0 0    
Loans Held-for-sale, Fair Value Disclosure 0 0    
Loans and lease receivables, net, fair value 0 0    
Accrued interest receivable, fair value 5,403 5,019    
Interest rate swaps - assets, fair value 0 0    
Financial liabilities:        
Deposits, fair value 1,001,498 1,010,147    
Federal Home Loan Bank and other borrowings fair value 0 0    
Junior subordinated notes, fair value 0 0    
Accrued interest payable, fair value 2,456 2,095    
Standby letters of credit, fair value 0 0    
Interest Rate Derivative Instruments, Both Hedging and Not Designated as Hedging, Liability at Fair Value, Fair Value Disclosure 0 0    
Fair Value Measurements - Level 2 Inputs        
Financial assets:        
Cash and cash equivalents, fair value 19,697 17,425    
Securities available-for-sale, fair value 127,961 126,005    
Held-to-maturity Securities, fair value 41,409 37,696    
Loans Held-for-sale, Fair Value Disclosure 3,772 2,413    
Loans and lease receivables, net, fair value 4,333 10,063    
Accrued interest receivable, fair value 0 0    
Interest rate swaps - assets, fair value 1,511 942    
Financial liabilities:        
Deposits, fair value 365,670 381,654    
Federal Home Loan Bank and other borrowings fair value 305,156 206,441    
Junior subordinated notes, fair value 0 0    
Accrued interest payable, fair value 0 0    
Standby letters of credit, fair value 0 0    
Interest Rate Derivative Instruments, Both Hedging and Not Designated as Hedging, Liability at Fair Value, Fair Value Disclosure 961 1,064    
Fair Value Measurements - Level 3 Inputs        
Financial assets:        
Cash and cash equivalents, fair value 0 0    
Securities available-for-sale, fair value 0 0    
Held-to-maturity Securities, fair value 0 0    
Loans Held-for-sale, Fair Value Disclosure 0 0    
Loans and lease receivables, net, fair value 1,537,524 1,472,601    
Accrued interest receivable, fair value 0 0    
Interest rate swaps - assets, fair value 0 0    
Financial liabilities:        
Deposits, fair value 0 0    
Federal Home Loan Bank and other borrowings fair value 0 0    
Junior subordinated notes, fair value 8,352 8,836    
Accrued interest payable, fair value 0 0    
Standby letters of credit, fair value 52 75    
Interest Rate Derivative Instruments, Both Hedging and Not Designated as Hedging, Liability at Fair Value, Fair Value Disclosure $ 0 $ 0