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Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance $ 8,308,000 $ 9,208,000 $ 10,133,000
Provision charged to operations 600,000 7,985,000 0
Losses charged to allowance (961,000) (9,834,000) (1,446,000)
Recoveries 1,663,000 949,000 521,000
Allowance for credit losses, ending balance 9,610,000 8,308,000 9,208,000
Ending balance: individually evaluated for impairment 164,000 612,000  
Ending balance: collectively evaluated for impairment 9,446,000 7,696,000  
Commercial      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 3,130,000 2,444,000  
Provision charged to operations 190,000 9,660,000  
Losses charged to allowance (802,000) (9,145,000)  
Recoveries 1,044,000 171,000  
Allowance for credit losses, ending balance 3,562,000 3,130,000 2,444,000
Ending balance: individually evaluated for impairment 1,000 230,000  
Ending balance: collectively evaluated for impairment 3,561,000 2,900,000  
Real Estate Portfolio Segment      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 4,058,000 5,174,000  
Provision charged to operations 1,114,000 (1,447,000)  
Losses charged to allowance 0 (183,000)  
Recoveries 32,000 514,000  
Allowance for credit losses, ending balance 5,204,000 4,058,000 5,174,000
Ending balance: individually evaluated for impairment 128,000 162,000  
Ending balance: collectively evaluated for impairment 5,076,000 3,896,000  
Consumer      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 1,078,000 1,168,000  
Provision charged to operations (772,000) 152,000  
Losses charged to allowance (159,000) (506,000)  
Recoveries 587,000 264,000  
Allowance for credit losses, ending balance 734,000 1,078,000 1,168,000
Ending balance: individually evaluated for impairment 35,000 220,000  
Ending balance: collectively evaluated for impairment 699,000 858,000  
Unallocated      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 42,000 422,000  
Provision charged to operations 68,000 (380,000)  
Losses charged to allowance 0 0  
Recoveries 0 0  
Allowance for credit losses, ending balance 110,000 42,000 $ 422,000
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment $ 110,000 $ 42,000