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Loans - (Additional Information Regarding Impaired Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Loans [Line Items]    
Unpaid principal balance, Total $ 59,541 $ 56,787
Recorded Investment In Acquired Impaired Loans 41,103 38,282
Loans and Leases Receivable, Allowance 2,916 2,408
Commercial and Industrial [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 9,676 8,671
Recorded investment with no related allowance recorded 8,507 7,495
Unpaid principal balance of impaired loans with an allowance recorded 3,476 3,495
Recorded investment of impaired loans with an allowance recorded 3,443 3,464
Allowance for loan losses allocated with an allowance recorded 491 492
Agriculture [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 2,798 2,044
Recorded investment with no related allowance recorded 2,740 1,987
Energy Loans [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 17,157 17,142
Recorded investment with no related allowance recorded 6,085 6,105
Unpaid principal balance of impaired loans with an allowance recorded 11,288 11,216
Recorded investment of impaired loans with an allowance recorded 6,621 6,548
Allowance for loan losses allocated with an allowance recorded 2,372 1,866
Commercial Loan [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 33,658 31,207
Recorded investment with no related allowance recorded 21,209 18,784
Unpaid principal balance of impaired loans with an allowance recorded 15,696 15,668
Recorded investment of impaired loans with an allowance recorded 10,737 10,654
Allowance for loan losses allocated with an allowance recorded 2,866 2,360
Multifamily [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 32 33
Recorded investment with no related allowance recorded 32 33
Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 4,027 3,350
Recorded investment with no related allowance recorded 3,877 3,197
Unpaid principal balance of impaired loans with an allowance recorded 932 957
Recorded investment of impaired loans with an allowance recorded 673 642
Allowance for loan losses allocated with an allowance recorded 3 2
Non Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 373 394
Recorded investment with no related allowance recorded 322 343
Unpaid principal balance of impaired loans with an allowance recorded 226 261
Recorded investment of impaired loans with an allowance recorded 220 255
Allowance for loan losses allocated with an allowance recorded 1 1
Total Commercial Real Estate [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 405 427
Recorded investment with no related allowance recorded 354 376
Unpaid principal balance of impaired loans with an allowance recorded 226 261
Recorded investment of impaired loans with an allowance recorded 220 255
Allowance for loan losses allocated with an allowance recorded 1 1
Senior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,100 1,551
Recorded investment with no related allowance recorded 1,042 1,426
Unpaid principal balance of impaired loans with an allowance recorded 6,418 5,646
Recorded investment of impaired loans with an allowance recorded 5,748 5,016
Allowance for loan losses allocated with an allowance recorded 33 31
Junior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded   54
Recorded investment with no related allowance recorded   51
Unpaid principal balance of impaired loans with an allowance recorded 1,854 1,781
Recorded investment of impaired loans with an allowance recorded 1,613 1,532
Allowance for loan losses allocated with an allowance recorded 14 14
Residential Real Estate Segment [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,100 1,605
Recorded investment with no related allowance recorded 1,042 1,477
Unpaid principal balance of impaired loans with an allowance recorded 8,272 7,427
Recorded investment of impaired loans with an allowance recorded 7,361 6,548
Allowance for loan losses allocated with an allowance recorded 47 45
Consumer [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 4 4
Recorded investment with no related allowance recorded 4 4
Unpaid principal balance of impaired loans with an allowance recorded 180 188
Recorded investment of impaired loans with an allowance recorded 176 184
Allowance for loan losses allocated with an allowance recorded 2 2
Impaired Loans With No Related Allowance Recorded [Member] [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 35,167 33,243
Recorded investment with no related allowance recorded 22,609 20,641
Impaired Loans With Related Allowance Recorded [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 24,374 23,544
Recorded investment of impaired loans with an allowance recorded 18,494 17,641
Allowance for loan losses allocated with an allowance recorded $ 2,916 $ 2,408