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Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
quarter
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance $ 9,610,000 $ 8,308,000 $ 9,208,000
Provision charged to operations (5,850,000) 600,000 7,985,000
Losses charged to allowance (883,000) (961,000) (9,834,000)
Recoveries 6,449,000 1,663,000 949,000
Allowance for credit losses, ending balance 9,326,000 9,610,000 8,308,000
Ending balance: individually evaluated for impairment 307,000 164,000  
Ending balance: collectively evaluated for impairment $ 9,019,000 9,446,000  
Number of rolling quarters used in analysis | quarter 20    
Commercial      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance $ 3,562,000 3,130,000 2,444,000
Provision charged to operations (6,048,000) 190,000 9,660,000
Losses charged to allowance (621,000) (802,000) (9,145,000)
Recoveries 5,287,000 1,044,000 171,000
Allowance for credit losses, ending balance 2,180,000 3,562,000 3,130,000
Ending balance: individually evaluated for impairment 3,000 1,000  
Ending balance: collectively evaluated for impairment 2,177,000 3,561,000  
Real Estate Portfolio Segment      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 5,204,000 4,058,000 5,174,000
Provision charged to operations 11,000 1,114,000 (1,447,000)
Losses charged to allowance 0 0 (183,000)
Recoveries 985,000 32,000 514,000
Allowance for credit losses, ending balance 6,200,000 5,204,000 4,058,000
Ending balance: individually evaluated for impairment 241,000 128,000  
Ending balance: collectively evaluated for impairment 5,959,000 5,076,000  
Consumer      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 734,000 1,078,000 1,168,000
Provision charged to operations 203,000 (772,000) 152,000
Losses charged to allowance (262,000) (159,000) (506,000)
Recoveries 177,000 587,000 264,000
Allowance for credit losses, ending balance 852,000 734,000 1,078,000
Ending balance: individually evaluated for impairment 63,000 35,000  
Ending balance: collectively evaluated for impairment 789,000 699,000  
Unallocated      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 110,000 42,000 422,000
Provision charged to operations (16,000) 68,000 (380,000)
Losses charged to allowance 0 0 0
Recoveries 0 0 0
Allowance for credit losses, ending balance 94,000 110,000 $ 42,000
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment $ 94,000 $ 110,000