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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Recorded investment in impaired loans:      
With no specific allowance recorded $ 12,928 $ 16,464  
With a specific allowance recorded 8,260 8,759  
Total recorded investment in impaired loans 21,188 25,223  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 14,920 22,677  
With a specific allowance recorded 8,489 9,028  
Total unpaid principal balance of impaired loans 23,409 31,705  
Specific valuation 1,169 1,138  
Average recorded investment in impaired loans during the period 23,273 25,909 $ 29,147
Interest income recognized on impaired loans 826 948 1,181
Charged-off portion of impaired loans 2,100 5,500  
Outstanding commitments to extend credit on impaired loans 1,300 1,400  
Commercial loans | Commercial      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,198 1,141  
With a specific allowance recorded 2,522 2,443  
Total recorded investment in impaired loans 4,720 3,584  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 2,198 1,186  
With a specific allowance recorded 2,565 2,524  
Total unpaid principal balance of impaired loans 4,763 3,710  
Specific valuation 912 694  
Average recorded investment in impaired loans during the period 4,237 5,354 7,168
Interest income recognized on impaired loans 238 378 476
Commercial real estate loans | Commercial real estate, owner-occupied      
Recorded investment in impaired loans:      
With no specific allowance recorded 4,111 5,577  
With a specific allowance recorded 2,882 2,882  
Total recorded investment in impaired loans 6,993 8,459  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 4,111 6,577  
With a specific allowance recorded 2,882 2,882  
Total unpaid principal balance of impaired loans 6,993 9,459  
Specific valuation 70 65  
Average recorded investment in impaired loans during the period 7,886 6,604 3,519
Interest income recognized on impaired loans 295 288 253
Commercial real estate loans | Commercial real estate, investor      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,416 2,954  
With a specific allowance recorded 0 0  
Total recorded investment in impaired loans 2,416 2,954  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 4,408 4,945  
With a specific allowance recorded 0 0  
Total unpaid principal balance of impaired loans 4,408 4,945  
Specific valuation 0 0  
Average recorded investment in impaired loans during the period 2,833 3,138 5,847
Interest income recognized on impaired loans 33 28 14
Commercial real estate loans | Construction      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,687 5,134  
With a specific allowance recorded 551 561  
Total recorded investment in impaired loans 3,238 5,695  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 2,687 7,824  
With a specific allowance recorded 737 749  
Total unpaid principal balance of impaired loans 3,424 8,573  
Specific valuation 1 3  
Average recorded investment in impaired loans during the period 4,164 6,471 7,200
Interest income recognized on impaired loans 86 85 249
Residential loans | Home equity      
Recorded investment in impaired loans:      
With no specific allowance recorded 171 393  
With a specific allowance recorded 388 300  
Total recorded investment in impaired loans 559 693  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 171 880  
With a specific allowance recorded 388 300  
Total unpaid principal balance of impaired loans 559 1,180  
Specific valuation 3 0  
Average recorded investment in impaired loans during the period 602 741 909
Interest income recognized on impaired loans 18 19 29
Residential loans | Other residential      
Recorded investment in impaired loans:      
With no specific allowance recorded 1,214 1,026  
With a specific allowance recorded 797 1,019  
Total recorded investment in impaired loans 2,011 2,045  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 1,214 1,026  
With a specific allowance recorded 797 1,019  
Total unpaid principal balance of impaired loans 2,011 2,045  
Specific valuation 67 92  
Average recorded investment in impaired loans during the period 2,028 1,744 2,632
Interest income recognized on impaired loans 92 74 89
Consumer loans | Installment and other consumer      
Recorded investment in impaired loans:      
With no specific allowance recorded 131 239  
With a specific allowance recorded 1,120 1,554  
Total recorded investment in impaired loans 1,251 1,793  
Unpaid principal balance of impaired loans:      
With no specific allowance recorded 131 239  
With a specific allowance recorded 1,120 1,554  
Total unpaid principal balance of impaired loans 1,251 1,793  
Specific valuation 116 284  
Average recorded investment in impaired loans during the period 1,523 1,857 1,872
Interest income recognized on impaired loans $ 64 $ 76 $ 71