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Loans, Purchase Credit Impaired ("PCI") Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
PCI loans contractually required payments would not be collected [Abstract]          
Accretions recorded as loan interest income $ 30   $ 70    
TCSB Bancorp, Inc. [Member]          
Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract]          
Total carrying amount 2,565   2,565   $ 0
Allowance for loan losses 0   0   0
Carrying amount, net of allowance for loan losses 2,565   2,565   0
Accretable yield of PCI loans, or income expected to be collected [Roll Forward]          
Balance at beginning of period 533 $ 0 0 $ 0  
New loans purchased 0 0 568 0  
Accretion of income (32) 0 (67) 0  
Reclassification from (to) nonaccretable difference 0 0 0 0  
Disposals/other adjustments 0 0 0 0  
Balance at end of period 501 $ 0 501 $ 0  
PCI loans contractually required payments would not be collected [Abstract]          
Contractually required payments 4,213   4,213    
Non accretable difference (742)   (742)    
Cash flows expected to be collected at acquisition 3,471   3,471    
Accretable yield (568)   (568)    
Fair value of acquired loans at acquisition 2,903   2,903    
Commercial [Member] | TCSB Bancorp, Inc. [Member]          
Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract]          
Total carrying amount 1,653   1,653   0
Mortgage [Member] | TCSB Bancorp, Inc. [Member]          
Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract]          
Total carrying amount 557   557   0
Installment [Member] | TCSB Bancorp, Inc. [Member]          
Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract]          
Total carrying amount $ 355   $ 355   $ 0