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Loans - (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Loans [Line Items]        
Impaired Financing Receivable, Average Recorded Investment $ 41,073 $ 48,322 $ 41,863 $ 48,983
Impaired Financing Receivable, Interest Income, Cash Basis Method 95 155 211 317
Commercial and Industrial [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 6,645 4,279 7,030 4,564
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 25 70 73 138
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 4,643 4,144 4,630 4,312
Owner-Occupied [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 3,789 1,825 3,834 1,869
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 23 20 41 49
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,340 842 2,349 865
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 7 4 11 7
Agriculture [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 1,454 1,758 1,531 1,758
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 912 178 914 179
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 1 1 3 3
Energy Loans [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 5,680   5,889  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6,624 25,975 6,602 26,005
Commercial Loan [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 17,568 7,862 18,284 8,191
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 48 90 114 187
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 14,519 31,139 14,495 31,361
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 8 5 14 10
Multifamily [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 31 35 31 36
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method     1 1
Non Owner-Occupied [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 312   320  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 5   12  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 216 814 220 823
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 2 10 5 24
Total Commercial Real Estate [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 312   320  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 5   12  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 247 849 251 859
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 2 10 6 25
Senior lien        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 330 1,296 334 1,312
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method   8   14
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6,525 5,149 6,583 5,212
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 20 28 40 53
Junior lien        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment   134   136
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method       1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,403 1,652 1,421 1,670
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 12 14 25 27
Residential Real Estate Segment [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 330 1,430 334 1,448
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method   8   15
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7,928 6,801 8,004 6,882
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 32 42 65 80
Consumer [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 169 241 175 242
Impaired Loans With No Related Allowance Recorded [Member] [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 18,210 9,292 18,938 9,639
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 53 98 126 202
Impaired Loans With Related Allowance Recorded [Member]        
Loans [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 22,863 39,030 22,925 39,344
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method $ 42 $ 57 $ 85 $ 115