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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
quarter
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
quarter
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Lookback period used in reserve analysis | quarter 20   20    
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 8,714 $ 7,307 $ 8,308 $ 9,208  
Provision charged to operations 100 0 600 (400)  
Losses charged to allowance (33) (58) (803) (1,845)  
Recoveries 312 240 988 526  
Allowance for credit losses, ending balance 9,093 7,489 9,093 7,489  
Ending balance: individually evaluated for impairment 191   191   $ 612
Ending balance: collectively evaluated for impairment 8,902   8,902   7,696
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 3,553 1,874 3,130 2,444  
Provision charged to operations (186) 243 731 768  
Losses charged to allowance (11) (1) (708) 1,195  
Recoveries 267 41 470 140  
Allowance for credit losses, ending balance 3,623 2,157 3,623 2,157  
Ending balance: individually evaluated for impairment 10   10   230
Ending balance: collectively evaluated for impairment 3,613   3,613   2,900
Real Estate Portfolio Segment          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 4,429 4,157 4,058 5,174  
Provision charged to operations 154 (121) 509 (970)  
Losses charged to allowance 0 0 0 183  
Recoveries 8 159 24 174  
Allowance for credit losses, ending balance 4,591 4,195 4,591 4,195  
Ending balance: individually evaluated for impairment 145   145   162
Ending balance: collectively evaluated for impairment 4,446   4,446   3,896
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 732 981 1,078 1,168  
Provision charged to operations 27 (85) (703) (34)  
Losses charged to allowance (22) (57) (95) 467  
Recoveries 37 40 494 212  
Allowance for credit losses, ending balance 774 879 774 879  
Ending balance: individually evaluated for impairment 36   36   220
Ending balance: collectively evaluated for impairment 738   738   858
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 0 295 42 422  
Provision charged to operations 105 (37) 63 (164)  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 105 $ 258 105 $ 258  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 105   $ 105   $ 42