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Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period $ 22,570 $ 25,990  
Additions (deductions) [Abstract]      
Provision for loan losses (530) (659)  
Recoveries credited to allowance 959 990  
Loans charged against the allowance (504) (1,642)  
Balance at end of period 22,495 24,679  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 10,850   $ 10,983
Collectively evaluated for impairment 11,645   11,587
Total ending allowance balance 22,495   22,570
Loans [Abstract]      
Individually evaluated for impairment 88,154   89,131
Collectively evaluated for impairment 1,455,356   1,430,756
Total loans recorded investment 1,543,510   1,519,887
Accrued interest included in recorded investment 4,528   4,837
Total loans 1,538,982   1,515,050
Commercial [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 5,670 5,445  
Additions (deductions) [Abstract]      
Provision for loan losses (404) 328  
Recoveries credited to allowance 356 433  
Loans charged against the allowance 0 (290)  
Balance at end of period 5,622 5,916  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 2,791   2,708
Collectively evaluated for impairment 2,831   2,962
Total ending allowance balance 5,622   5,670
Loans [Abstract]      
Individually evaluated for impairment 17,585   16,868
Collectively evaluated for impairment 754,908   733,399
Total loans recorded investment 772,493   750,267
Accrued interest included in recorded investment 1,607   1,869
Total loans 770,886   748,398
Mortgage [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 10,391 13,444  
Additions (deductions) [Abstract]      
Provision for loan losses (279) (733)  
Recoveries credited to allowance 382 238  
Loans charged against the allowance (198) (868)  
Balance at end of period 10,296 12,081  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 7,651   7,818
Collectively evaluated for impairment 2,645   2,573
Total ending allowance balance 10,296   10,391
Loans [Abstract]      
Individually evaluated for impairment 64,899   66,375
Collectively evaluated for impairment 441,354   436,349
Total loans recorded investment 506,253   502,724
Accrued interest included in recorded investment [1] 2,249   2,270
Total loans 504,004   500,454
Installment [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 1,181 1,814  
Additions (deductions) [Abstract]      
Provision for loan losses 65 (85)  
Recoveries credited to allowance 221 319  
Loans charged against the allowance (306) (484)  
Balance at end of period 1,161 1,564  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 408   457
Collectively evaluated for impairment 753   724
Total ending allowance balance 1,161   1,181
Loans [Abstract]      
Individually evaluated for impairment 5,670   5,888
Collectively evaluated for impairment 226,789   226,409
Total loans recorded investment 232,459   232,297
Accrued interest included in recorded investment [1] 672   698
Total loans 231,787   231,599
Payment Plan Receivables [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 56 64  
Additions (deductions) [Abstract]      
Provision for loan losses (3) (2)  
Recoveries credited to allowance 0 0  
Loans charged against the allowance 0 0  
Balance at end of period 53 62  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 53   56
Total ending allowance balance 53   56
Loans [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 32,305   34,599
Total loans recorded investment 32,305   34,599
Accrued interest included in recorded investment 0   0
Total loans 32,305   34,599
Subjective Allocation [Member]      
Analysis of allowance for loan losses by portfolio segment [Roll Forward]      
Balance at beginning of period 5,272 5,223  
Additions (deductions) [Abstract]      
Provision for loan losses 91 (167)  
Recoveries credited to allowance 0 0  
Loans charged against the allowance 0 0  
Balance at end of period 5,363 $ 5,056  
Allowance for loan losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 5,363   5,272
Total ending allowance balance $ 5,363   $ 5,272
[1] Credit scores have been updated within the last twelve months.