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Loans - (Additional Information Regarding Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Loans [Line Items]    
Unpaid principal balance, Total $ 53,531 $ 56,787
Recorded Investment In Acquired Impaired Loans 39,379 38,282
Loans and Leases Receivable, Allowance 6,246 2,408
Commercial and Industrial [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 6,712 8,671
Recorded investment with no related allowance recorded 5,387 7,495
Unpaid principal balance of impaired loans with an allowance recorded 4,681 3,495
Recorded investment of impaired loans with an allowance recorded 4,642 3,464
Allowance for loan losses allocated with an allowance recorded 2,767 492
Agriculture [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,581 2,044
Recorded investment with no related allowance recorded 1,377 1,987
Unpaid principal balance of impaired loans with an allowance recorded 938  
Recorded investment of impaired loans with an allowance recorded 911  
Allowance for loan losses allocated with an allowance recorded 35  
Energy Loans [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 16,548 17,142
Recorded investment with no related allowance recorded 5,437 6,105
Unpaid principal balance of impaired loans with an allowance recorded 6,613 11,216
Recorded investment of impaired loans with an allowance recorded 6,613 6,548
Allowance for loan losses allocated with an allowance recorded 3,148 1,866
Commercial Loan [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 28,795 31,207
Recorded investment with no related allowance recorded 15,956 18,784
Unpaid principal balance of impaired loans with an allowance recorded 14,817 15,668
Recorded investment of impaired loans with an allowance recorded 14,502 10,654
Allowance for loan losses allocated with an allowance recorded 6,198 2,360
Multifamily [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 31 33
Recorded investment with no related allowance recorded 31 33
Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 3,954 3,350
Recorded investment with no related allowance recorded 3,755 3,197
Unpaid principal balance of impaired loans with an allowance recorded 2,585 957
Recorded investment of impaired loans with an allowance recorded 2,336 642
Allowance for loan losses allocated with an allowance recorded 248 2
Non Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 357 394
Recorded investment with no related allowance recorded 306 343
Unpaid principal balance of impaired loans with an allowance recorded 220 261
Recorded investment of impaired loans with an allowance recorded 214 255
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 388 427
Recorded investment with no related allowance recorded 337 376
Unpaid principal balance of impaired loans with an allowance recorded 220 261
Recorded investment of impaired loans with an allowance recorded 214 255
Allowance for loan losses allocated with an allowance recorded 1 1
Senior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 345 1,551
Recorded investment with no related allowance recorded 328 1,426
Unpaid principal balance of impaired loans with an allowance recorded 7,162 5,646
Recorded investment of impaired loans with an allowance recorded 6,486 5,016
Allowance for loan losses allocated with an allowance recorded 36 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 1,634 1,781
Recorded investment of impaired loans with an allowance recorded 1,391 1,532
Allowance for loan losses allocated with an allowance recorded 10 14
Residential Real Estate Segment [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 345 1,605
Recorded investment with no related allowance recorded 328 1,477
Unpaid principal balance of impaired loans with an allowance recorded 8,796 7,427
Recorded investment of impaired loans with an allowance recorded 7,877 6,548
Allowance for loan losses allocated with an allowance recorded 46 45
Consumer [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded   4
Recorded investment with no related allowance recorded   4
Unpaid principal balance of impaired loans with an allowance recorded 170 188
Recorded investment of impaired loans with an allowance recorded 165 184
Allowance for loan losses allocated with an allowance recorded 1 2
Impaired Loans With No Related Allowance Recorded [Member] [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 29,528 33,243
Recorded investment with no related allowance recorded 16,621 20,641
Impaired Loans With Related Allowance Recorded [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 24,003 23,544
Recorded investment of impaired loans with an allowance recorded 22,758 17,641
Allowance for loan losses allocated with an allowance recorded $ 6,246 $ 2,408