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Loans, Allowance for Loan Losses (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
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period $ 23,504 $ 20,586 $ 22,587 $ 20,234  
Additions (deductions) [Abstract]          
Provision for loan losses (53) 582 912 806  
Recoveries credited to the allowance 1,908 1,212 3,768 2,998  
Loans charged against the allowance (958) (902) (2,866) (2,560)  
Balance at end of period 24,401 21,478 24,401 21,478  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 6,102   6,102   $ 6,839
Collectively evaluated for impairment 18,299   18,299   15,748
Total ending allowance balance 24,401   24,401   22,587
Loans [Abstract]          
Individually evaluated for impairment 62,159   62,159   65,544
Collectively evaluated for impairment 2,506,229   2,506,229   1,959,774
Total loans recorded investment 2,570,953   2,570,953   2,025,318
Accrued interest included in recorded investment 8,375   8,375   6,501
Total loans 2,562,578   2,562,578   2,018,817
Loans Acquired with Deteriorated Credit Quality [Member]          
Allowance for loan losses [Abstract]          
Loans acquired with deteriorated credit quality 0   0    
Loans [Abstract]          
Loans acquired with deteriorated credit quality 2,565   2,565    
Commercial [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 6,073 5,100 5,595 4,880  
Additions (deductions) [Abstract]          
Provision for loan losses (907) (97) (1,404) (197)  
Recoveries credited to the allowance 1,418 340 2,458 946  
Loans charged against the allowance (225) (92) (290) (378)  
Balance at end of period 6,359 5,251 6,359 5,251  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 727   727   837
Collectively evaluated for impairment 5,632   5,632   4,758
Total ending allowance balance 6,359   6,359   5,595
Loans [Abstract]          
Individually evaluated for impairment 9,714   9,714   8,420
Collectively evaluated for impairment 1,103,860   1,103,860   847,140
Total loans recorded investment 1,115,227   1,115,227   855,560
Accrued interest included in recorded investment 3,126   3,126   2,300
Total loans 1,112,101   1,112,101   853,260
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]          
Allowance for loan losses [Abstract]          
Loans acquired with deteriorated credit quality 0   0    
Loans [Abstract]          
Loans acquired with deteriorated credit quality 1,653   1,653    
Mortgage [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 8,296 8,145 8,733 8,681  
Additions (deductions) [Abstract]          
Provision for loan losses 415 68 778 (593)  
Recoveries credited to the allowance 192 587 549 1,264  
Loans charged against the allowance (448) (471) (1,605) (1,023)  
Balance at end of period 8,455 8,329 8,455 8,329  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 5,155   5,155   5,725
Collectively evaluated for impairment 3,300   3,300   3,008
Total ending allowance balance 8,455   8,455   8,733
Loans [Abstract]          
Individually evaluated for impairment 48,815   48,815   53,179
Collectively evaluated for impairment 1,011,276   1,011,276   799,629
Total loans recorded investment 1,060,648   1,060,648   852,808
Accrued interest included in recorded investment [1] 4,166   4,166   3,278
Total loans 1,056,482   1,056,482   849,530
Mortgage [Member] | Loans Acquired with Deteriorated Credit Quality [Member]          
Allowance for loan losses [Abstract]          
Loans acquired with deteriorated credit quality 0   0    
Loans [Abstract]          
Loans acquired with deteriorated credit quality 557   557    
Installment [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 848 900 864 1,011  
Additions (deductions) [Abstract]          
Provision for loan losses (25) (33) 182 173  
Recoveries credited to the allowance 298 285 761 788  
Loans charged against the allowance (285) (339) (971) (1,159)  
Balance at end of period 836 813 836 813  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 220   220   277
Collectively evaluated for impairment 616   616   587
Total ending allowance balance 836   836   864
Loans [Abstract]          
Individually evaluated for impairment 3,630   3,630   3,945
Collectively evaluated for impairment 391,093   391,093   313,005
Total loans recorded investment 395,078   395,078   316,950
Accrued interest included in recorded investment [2] 1,083   1,083   923
Total loans 393,995   393,995   316,027
Installment [Member] | Loans Acquired with Deteriorated Credit Quality [Member]          
Allowance for loan losses [Abstract]          
Loans acquired with deteriorated credit quality 0   0    
Loans [Abstract]          
Loans acquired with deteriorated credit quality 355   355    
Subjective Allocation [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 8,287 6,441 7,395 5,662  
Additions (deductions) [Abstract]          
Provision for loan losses 464 644 1,356 1,423  
Recoveries credited to the allowance 0 0 0 0  
Loans charged against the allowance 0 0 0 0  
Balance at end of period 8,751 $ 7,085 8,751 $ 7,085  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 8,751   8,751   7,395
Total ending allowance balance 8,751   8,751   $ 7,395
Subjective Allocation [Member] | Loans Acquired with Deteriorated Credit Quality [Member]          
Allowance for loan losses [Abstract]          
Loans acquired with deteriorated credit quality $ 0   $ 0    
[1] Other than for the TCSB Bancorp, Inc. ("TCSB") acquired loans, credit scores have been updated within the last twelve months.
[2] Other than for the TCSB acquired loans, credit scores have been updated within the last twelve months.