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Loans - (Credit Exposure for Loans as Determined by Company's Internal Risk Rating System) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Loans [Line Items]      
Total Loans $ 3,087,945 $ 2,860,921 $ 2,738,504
Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,775,454 1,560,430  
Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 728,511 744,885  
Consumer [Member]      
Loans [Line Items]      
Total Loans 26,960 28,814  
Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 557,020 526,792  
Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 2,953,518 2,715,069  
Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,739,476 1,521,150  
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 714,499 728,361  
Non ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 26,308 27,916  
Non ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 473,235 437,642  
ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 134,427 145,852  
ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 35,978 39,280  
ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 14,012 16,524  
ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 652 898  
ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 83,785 89,150  
Total Loans [Member]      
Loans [Line Items]      
Total Loans 3,087,945 2,860,921  
Total Loans [Member] | Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 2,953,518 2,715,069  
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 1,275,855 1,074,696  
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]      
Loans [Line Items]      
Total Loans 131,398 134,637  
Total Loans [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 98,293 90,273  
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,739,476 1,521,150  
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 473,235 437,642  
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 121,656 90,314  
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 16,342 13,306  
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 41,430 24,954  
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 233,930 221,544  
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 293,807 309,068  
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 714,499 728,361  
Total Loans [Member] | Non ASC 310-30 [Member] | Senior lien      
Loans [Line Items]      
Total Loans 662,222 675,690  
Total Loans [Member] | Non ASC 310-30 [Member] | Junior lien      
Loans [Line Items]      
Total Loans 52,277 52,671  
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 26,308 27,916  
Total Loans [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 134,427 145,852  
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 35,978 39,280  
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 14,012 16,524  
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 652 898  
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 83,785 89,150  
Total Loans [Member] | Pass [Member]      
Loans [Line Items]      
Total Loans 2,951,775 2,696,660  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 2,858,071 2,617,131  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 1,243,638 1,041,326  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Agriculture [Member]      
Loans [Line Items]      
Total Loans 106,022 123,809  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 86,243 77,619  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,658,785 1,444,790  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 465,547 424,274  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 121,441 90,099  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 13,844 10,758  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 39,255 22,495  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 222,882 202,036  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 291,007 300,922  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 707,653 720,398  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Senior lien      
Loans [Line Items]      
Total Loans 656,249 669,148  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Junior lien      
Loans [Line Items]      
Total Loans 51,404 51,250  
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 26,086 27,669  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 93,704 79,529  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 27,799 27,436  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 11,234 12,477  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 464 721  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 54,207 38,895  
Total Loans [Member] | Special Mention [Member]      
Loans [Line Items]      
Total Loans 49,530 38,590  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 45,624 35,669  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 13,978 7,243  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Agriculture [Member]      
Loans [Line Items]      
Total Loans 22,668 8,922  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 41,253 25,536  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 4,064 8,681  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 2,498 2,548  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans   238  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 4,607 9,371  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 1,566 5,895  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 251 1,393  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Senior lien      
Loans [Line Items]      
Total Loans 251 1,215  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Junior lien      
Loans [Line Items]      
Total Loans   178  
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 56 59  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 3,906 2,921  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,105 610  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 1,088 1,327  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 12 17  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 1,701 967  
Total Loans [Member] | Substandard [Member]      
Loans [Line Items]      
Total Loans 77,529 116,558  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 40,712 56,924  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 15,472 25,636  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Agriculture [Member]      
Loans [Line Items]      
Total Loans 2,674 1,906  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 5,998 7,811  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 30,340 45,490  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 3,624 4,687  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 215 215  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 2,175 2,221  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 6,196 10,137  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 1,234 2,251  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 6,582 6,559  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Senior lien      
Loans [Line Items]      
Total Loans 5,709 5,316  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Junior lien      
Loans [Line Items]      
Total Loans 873 1,243  
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 166 188  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 36,817 59,634  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 7,074 11,234  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 1,690 2,720  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 176 160  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 27,877 45,520  
Total Loans [Member] | Doubtful [Member]      
Loans [Line Items]      
Total Loans 9,111 9,113  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 9,111 5,345  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 2,767 491  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Agriculture [Member]      
Loans [Line Items]      
Total Loans 34    
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 6,052 4,843  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 9,098 5,334  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 245    
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 13 11  
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Senior lien      
Loans [Line Items]      
Total Loans $ 13 11  
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans   3,768  
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans   $ 3,768