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Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period $ 22,587 $ 20,234  
Additions (deductions) [Abstract]      
Provision for loan losses 315 (359)  
Recoveries credited to the allowance 1,014 1,129  
Loans charged against the allowance (845) (966)  
Balance at end of period 23,071 20,038  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 6,332   $ 6,839
Collectively evaluated for impairment 16,739   15,748
Total ending allowance balance 23,071   22,587
Loans [Abstract]      
Individually evaluated for impairment 64,069   65,544
Collectively evaluated for impairment 2,013,828   1,959,774
Total loans recorded investment 2,077,897   2,025,318
Accrued interest included in recorded investment 6,462   6,501
Total loans 2,071,435   2,018,817
Commercial [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 5,595 4,880  
Additions (deductions) [Abstract]      
Provision for loan losses (135) (61)  
Recoveries credited to the allowance 606 404  
Loans charged against the allowance (40) (135)  
Balance at end of period 6,026 5,088  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 739   837
Collectively evaluated for impairment 5,287   4,758
Total ending allowance balance 6,026   5,595
Loans [Abstract]      
Individually evaluated for impairment 8,348   8,420
Collectively evaluated for impairment 851,338   847,140
Total loans recorded investment 859,686   855,560
Accrued interest included in recorded investment 2,269   2,300
Total loans 857,417   853,260
Mortgage [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 8,733 8,681  
Additions (deductions) [Abstract]      
Provision for loan losses 147 (699)  
Recoveries credited to the allowance 180 486  
Loans charged against the allowance (439) (359)  
Balance at end of period 8,621 8,109  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 5,345   5,725
Collectively evaluated for impairment 3,276   3,008
Total ending allowance balance 8,621   8,733
Loans [Abstract]      
Individually evaluated for impairment 51,830   53,179
Collectively evaluated for impairment 840,396   799,629
Total loans recorded investment 892,226   852,808
Accrued interest included in recorded investment [1] 3,316   3,278
Total loans 888,910   849,530
Installment [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 864 1,011  
Additions (deductions) [Abstract]      
Provision for loan losses 69 133  
Recoveries credited to the allowance 228 239  
Loans charged against the allowance (366) (472)  
Balance at end of period 795 911  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 248   277
Collectively evaluated for impairment 547   587
Total ending allowance balance 795   864
Loans [Abstract]      
Individually evaluated for impairment 3,891   3,945
Collectively evaluated for impairment 322,094   313,005
Total loans recorded investment 325,985   316,950
Accrued interest included in recorded investment [1] 877   923
Total loans 325,108   316,027
Subjective Allocation [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 7,395 5,662  
Additions (deductions) [Abstract]      
Provision for loan losses 234 268  
Recoveries credited to the allowance 0 0  
Loans charged against the allowance 0 0  
Balance at end of period 7,629 $ 5,930  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 7,629   7,395
Total ending allowance balance $ 7,629   $ 7,395
[1] Credit scores have been updated within the last twelve months.