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Fair Value Measurement, Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets [Abstract]    
Securities available for sale $ 72,629 $ 72,153
Level 1 [Member]    
Assets [Abstract]    
Cash and short-term investments 20,989 29,091
Securities available for sale 0 382
Restricted investments 0 0
Loans, net 0 0
Accrued interest receivable 0 0
Interest rate swaps 0 0
Bank-owned life insurance 0 0
Total assets at fair value 20,989 29,473
Liabilities [Abstract]    
Deposits 0 0
Federal funds purchased 0  
FHLB advances 0 0
Junior subordinated debt 0 0
Accrued interest payable 0 0
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Level 2 [Member]    
Assets [Abstract]    
Cash and short-term investments 0 0
Securities available for sale 72,629 71,771
Restricted investments 2,495 1,546
Loans, net 0 494,143
Accrued interest receivable 1,944 1,940
Interest rate swaps 594 233
Bank-owned life insurance 13,505 13,234
Total assets at fair value 91,167 582,867
Liabilities [Abstract]    
Deposits 565,159 569,297
Federal funds purchased 4,997  
FHLB advances 29,603 7,766
Junior subordinated debt 4,795 4,116
Accrued interest payable 244 128
Interest rate swaps 22 119
Total liabilities at fair value 604,820 581,426
Level 3 [Member]    
Assets [Abstract]    
Cash and short-term investments 0 0
Securities available for sale 0 0
Restricted investments 0 0
Loans, net 509,568 46
Accrued interest receivable 0 0
Interest rate swaps 0 0
Bank-owned life insurance 0 0
Total assets at fair value 509,568 46
Liabilities [Abstract]    
Deposits 0 0
Federal funds purchased 0  
FHLB advances 0 0
Junior subordinated debt 0 0
Accrued interest payable 0 0
Interest rate swaps 0 0
Total liabilities at fair value 0 0
Carrying Amount [Member]    
Assets [Abstract]    
Cash and short-term investments 20,989 29,300
Securities available for sale 72,629 72,153
Restricted investments 2,495 1,546
Loans, net 527,802 497,705
Accrued interest receivable 1,944 1,940
Interest rate swaps 594 233
Bank-owned life insurance 13,505 13,234
Total assets at fair value 639,958 616,111
Liabilities [Abstract]    
Deposits 566,231 570,023
Federal funds purchased 5,000  
FHLB advances 29,800 7,860
Junior subordinated debt 4,124 4,124
Accrued interest payable 244 128
Interest rate swaps 22 119
Total liabilities at fair value 605,421 582,254
Fair Value [Member]    
Assets [Abstract]    
Cash and short-term investments 20,989 29,091
Securities available for sale 72,629 72,153
Restricted investments 2,495 1,546
Loans, net 509,568 494,189
Accrued interest receivable 1,944 1,940
Interest rate swaps 594 233
Bank-owned life insurance 13,505 13,234
Total assets at fair value 621,724 612,386
Liabilities [Abstract]    
Deposits 565,159 569,297
Federal funds purchased 4,997  
FHLB advances 29,603 7,766
Junior subordinated debt 4,795 4,116
Accrued interest payable 244 128
Interest rate swaps 22 119
Total liabilities at fair value $ 604,820 $ 581,426