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Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period $ 23,071 $ 20,038 $ 22,587 $ 20,234  
Additions (deductions) [Abstract]          
Provision for loan losses 650 583 965 224  
Recoveries credited to the allowance 846 657 1,860 1,786  
Loans charged against the allowance (1,063) (692) (1,908) (1,658)  
Balance at end of period 23,504 20,586 23,504 20,586  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 6,307   6,307   $ 6,839
Collectively evaluated for impairment 17,197   17,197   15,748
Total ending allowance balance 23,504   23,504   22,587
Loans [Abstract]          
Individually evaluated for impairment 64,390   64,390   65,544
Collectively evaluated for impairment 2,408,208   2,408,208   1,959,774
Total loans recorded investment 2,475,434   2,475,434   2,025,318
Accrued interest included in recorded investment 8,117   8,117   6,501
Total loans 2,467,317   2,467,317   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 2,836   2,836    
Commercial [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 6,026 5,088 5,595 4,880  
Additions (deductions) [Abstract]          
Provision for loan losses (362) (39) (497) (100)  
Recoveries credited to the allowance 434 202 1,040 606  
Loans charged against the allowance (25) (151) (65) (286)  
Balance at end of period 6,073 5,100 6,073 5,100  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 772   772   837
Collectively evaluated for impairment 5,301   5,301   4,758
Total ending allowance balance 6,073   6,073   5,595
Loans [Abstract]          
Individually evaluated for impairment 10,708   10,708   8,420
Collectively evaluated for impairment 1,097,576   1,097,576   847,140
Total loans recorded investment 1,110,107   1,110,107   855,560
Accrued interest included in recorded investment 3,120   3,120   2,300
Total loans 1,106,987   1,106,987   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 1,823   1,823    
Mortgage [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 8,621 8,109 8,733 8,681  
Additions (deductions) [Abstract]          
Provision for loan losses 216 38 363 (661)  
Recoveries credited to the allowance 177 191 357 677  
Loans charged against the allowance (718) (193) (1,157) (552)  
Balance at end of period 8,296 8,145 8,296 8,145  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 5,302   5,302   5,725
Collectively evaluated for impairment 2,994   2,994   3,008
Total ending allowance balance 8,296   8,296   8,733
Loans [Abstract]          
Individually evaluated for impairment 49,886   49,886   53,179
Collectively evaluated for impairment 942,074   942,074   799,629
Total loans recorded investment 992,611   992,611   852,808
Accrued interest included in recorded investment [1] 3,989   3,989   3,278
Total loans 988,622   988,622   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 651   651    
Installment [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 795 911 864 1,011  
Additions (deductions) [Abstract]          
Provision for loan losses 138 73 207 206  
Recoveries credited to the allowance 235 264 463 503  
Loans charged against the allowance (320) (348) (686) (820)  
Balance at end of period 848 900 848 900  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 233   233   277
Collectively evaluated for impairment 615   615   587
Total ending allowance balance 848   848   864
Loans [Abstract]          
Individually evaluated for impairment 3,796   3,796   3,945
Collectively evaluated for impairment 368,558   368,558   313,005
Total loans recorded investment 372,716   372,716   316,950
Accrued interest included in recorded investment [2] 1,008   1,008   923
Total loans 371,708   371,708   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 362   362    
Subjective Allocation [Member]          
Analysis of allowance for loan losses by portfolio segment [Roll Forward]          
Balance at beginning of period 7,629 5,930 7,395 5,662  
Additions (deductions) [Abstract]          
Provision for loan losses 658 511 892 779  
Recoveries credited to the allowance 0 0 0 0  
Loans charged against the allowance 0 0 0 0  
Balance at end of period 8,287 $ 6,441 8,287 $ 6,441  
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 8,287   8,287   7,395
Total ending allowance balance 8,287   8,287   $ 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.