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Loans - (Additional Information Regarding Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Loans [Line Items]    
Unpaid principal balance, Total $ 50,533 $ 38,069
Recorded Investment In Acquired Impaired Loans 46,815 37,363
Loans and Leases Receivable, Allowance 14,975 4,388
Commercial and Industrial [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 3,268 4,997
Recorded investment with no related allowance recorded 3,106 4,995
Unpaid principal balance of impaired loans with an allowance recorded 5,483 4,537
Recorded investment of impaired loans with an allowance recorded 3,983 4,503
Allowance for loan losses allocated with an allowance recorded 2,203 1,918
Agriculture [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,772 1,877
Recorded investment with no related allowance recorded 1,758 1,878
Unpaid principal balance of impaired loans with an allowance recorded 223 254
Recorded investment of impaired loans with an allowance recorded 177 248
Allowance for loan losses allocated with an allowance recorded   1
Energy Loans [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded   5,815
Recorded investment with no related allowance recorded   5,749
Unpaid principal balance of impaired loans with an allowance recorded 26,161 6,279
Recorded investment of impaired loans with an allowance recorded 25,913 6,260
Allowance for loan losses allocated with an allowance recorded 12,726 2,127
Commercial Loan [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 7,106 14,906
Recorded investment with no related allowance recorded 6,681 14,772
Unpaid principal balance of impaired loans with an allowance recorded 33,122 12,342
Recorded investment of impaired loans with an allowance recorded 30,901 12,128
Allowance for loan losses allocated with an allowance recorded 14,932 4,048
Commercial Construction [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded   190
Recorded investment with no related allowance recorded   188
Multifamily [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 35 61
Recorded investment of impaired loans with an allowance recorded 35 59
Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 2,066 2,218
Recorded investment with no related allowance recorded 1,817 2,150
Unpaid principal balance of impaired loans with an allowance recorded 1,255 1,272
Recorded investment of impaired loans with an allowance recorded 828 1,117
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   154
Recorded investment with no related allowance recorded   153
Unpaid principal balance of impaired loans with an allowance recorded 863 1,642
Recorded investment of impaired loans with an allowance recorded 808 1,630
Allowance for loan losses allocated with an allowance recorded 3 274
Total Commercial Real Estate [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded   344
Recorded investment with no related allowance recorded   341
Unpaid principal balance of impaired loans with an allowance recorded 898 1,703
Recorded investment of impaired loans with an allowance recorded 843 1,689
Allowance for loan losses allocated with an allowance recorded 3 274
Senior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,408 947
Recorded investment with no related allowance recorded 1,293 941
Unpaid principal balance of impaired loans with an allowance recorded 5,676 5,827
Recorded investment of impaired loans with an allowance recorded 5,086 5,701
Allowance for loan losses allocated with an allowance recorded 25 54
Junior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 138 113
Recorded investment with no related allowance recorded 133 112
Unpaid principal balance of impaired loans with an allowance recorded 1,942 1,800
Recorded investment of impaired loans with an allowance recorded 1,638 1,593
Allowance for loan losses allocated with an allowance recorded 13 11
Residential Real Estate Segment [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,546 1,060
Recorded investment with no related allowance recorded 1,426 1,052
Unpaid principal balance of impaired loans with an allowance recorded 7,618 7,627
Recorded investment of impaired loans with an allowance recorded 6,724 7,294
Allowance for loan losses allocated with an allowance recorded 38 65
Consumer [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 243 86
Recorded investment of impaired loans with an allowance recorded 240 86
Allowance for loan losses allocated with an allowance recorded 2 1
Impaired Loans With No Related Allowance Recorded [Member] [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 8,652 16,311
Recorded investment with no related allowance recorded 8,107 16,165
Impaired Loans with Related Allowance Recorded [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 41,881 21,758
Recorded investment of impaired loans with an allowance recorded 38,708 21,198
Allowance for loan losses allocated with an allowance recorded $ 14,975 $ 4,388