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Loans and Allowance for Loan Losses - Credit risk profile by risk grade of non acquired loans - (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans and Allowance for Loan Losses          
Other Real Estate, Non Covered $ 18,316 $ 4,200 $ 24,803 $ 26,499 $ 37,398
Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 5,241,041   4,220,726 3,467,826  
Classified Assets 42,800   56,200    
Other Real Estate, Non Covered 3,900   8,700    
Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 5,112,628   4,077,013    
Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 89,489   96,261    
Non-acquired loans | Substandard and doubtful          
Loans and Allowance for Loan Losses          
Total loans 38,900   47,500    
Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 38,924   47,430    
Non-acquired loans | Doubtful          
Loans and Allowance for Loan Losses          
Total loans     22    
Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Total loans 836,699   1,049,538 1,327,999  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 836,699   1,049,538    
Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 812,320   1,022,135    
Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 13,355   7,369    
Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 11,024   20,034    
Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 605,941   737,576 926,767  
Acquired credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 356,544   414,572    
Acquired credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 115,726   142,378    
Acquired credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 133,671   180,626    
Residential real estate          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 258,100   313,319    
Residential real estate | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 138,343   166,309    
Residential real estate | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 52,546   63,341    
Residential real estate | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 67,211   83,669    
Residential real estate | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 258,100   313,319 390,244  
Commercial non-owner occupied real estate | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 1,295,179   889,756    
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development          
Loans and Allowance for Loan Losses          
Total loans 580,464   401,979 364,221  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Pass          
Loans and Allowance for Loan Losses          
Total loans 567,398   382,167    
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Special mention          
Loans and Allowance for Loan Losses          
Total loans 8,421   13,633    
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Substandard          
Loans and Allowance for Loan Losses          
Total loans 4,645   6,179    
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate          
Loans and Allowance for Loan Losses          
Total loans 714,715   487,777 333,590  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Pass          
Loans and Allowance for Loan Losses          
Total loans 701,150   471,466    
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Special mention          
Loans and Allowance for Loan Losses          
Total loans 11,434   13,912    
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Substandard          
Loans and Allowance for Loan Losses          
Total loans 2,131   2,399    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development          
Loans and Allowance for Loan Losses          
Total loans 10,090   13,849 24,099  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 10,090   13,849    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 8,997   12,935    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 253   109    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 840   805    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate          
Loans and Allowance for Loan Losses          
Total loans 34,628   40,103 49,476  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 34,628   40,103    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 28,368   33,485    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,171   637    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 89   5,981    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 44,373   54,272 65,262  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 21,150   26,308    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 12,643   14,532    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 10,580   13,432    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Doubtful          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 44,373   54,272    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 210,204   255,430 325,109  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 162,870   177,656    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 26,238   37,607    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 21,096   40,167    
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Doubtful          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 210,204   255,430    
Commercial owner occupied real estate loan | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 1,177,745   1,033,398 907,913  
Commercial owner occupied real estate loan | Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 1,149,417   994,442    
Commercial owner occupied real estate loan | Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 22,133   29,478    
Commercial owner occupied real estate loan | Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 6,195   9,478    
Commercial owner occupied real estate loan | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Total loans 27,195   39,220 62,065  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 27,195   39,220    
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 26,920   38,623    
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance     377    
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 275   220    
Consumer real estate | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 1,580,839   1,338,239    
Consumer real estate | Non-acquired loans | Home equity loans          
Loans and Allowance for Loan Losses          
Total loans 383,218   319,255 283,934  
Consumer real estate | Non-acquired loans | Home equity loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 368,655   304,744    
Consumer real estate | Non-acquired loans | Home equity loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 8,145   8,171    
Consumer real estate | Non-acquired loans | Home equity loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 6,418   6,318    
Consumer real estate | Non-acquired loans | Home equity loans | Doubtful          
Loans and Allowance for Loan Losses          
Total loans     22    
Consumer real estate | Non-acquired loans | Other Consumer          
Loans and Allowance for Loan Losses          
Total loans 13,404   46,573    
Consumer real estate | Non-acquired loans | Other Consumer | Pass          
Loans and Allowance for Loan Losses          
Total loans 13,404   46,573    
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans          
Loans and Allowance for Loan Losses          
Total loans 1,197,621   1,018,984 786,778  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 1,167,768   984,780    
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 15,283   17,777    
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 14,570   16,427    
Consumer real estate | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 711,803   879,722    
Consumer real estate | Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 696,199   862,688    
Consumer real estate | Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,541   5,488    
Consumer real estate | Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 9,063   11,546    
Consumer real estate | Acquired non-credit impaired loans | Home equity loans          
Loans and Allowance for Loan Losses          
Total loans 160,879   190,968 234,949  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 160,879   190,968    
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 151,752   180,472    
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 4,113   4,202    
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 5,014   6,294    
Consumer real estate | Acquired non-credit impaired loans | Other Consumer          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 142,654   170,647    
Consumer real estate | Acquired non-credit impaired loans | Other Consumer | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 139,686   167,399    
Consumer real estate | Acquired non-credit impaired loans | Other Consumer | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,102   729    
Consumer real estate | Acquired non-credit impaired loans | Other Consumer | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,866   2,519    
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans          
Loans and Allowance for Loan Losses          
Total loans 408,270   518,107 646,375  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 408,270   518,107    
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 404,761   514,817    
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,326   557    
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,183   2,733    
Consumer real estate | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 59,300   70,734 85,449  
Commercial and industrial          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 25,347   31,193    
Commercial and industrial | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 17,371   22,358    
Commercial and industrial | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 4,614   2,549    
Commercial and industrial | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,362   6,286    
Commercial and industrial | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 671,398   503,808 405,923  
Commercial and industrial | Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 655,157   497,572    
Commercial and industrial | Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 14,325   4,472    
Commercial and industrial | Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 1,916   1,764    
Commercial and industrial | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Total loans 13,641   25,475 41,130  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 13,641   25,475    
Commercial and industrial | Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 13,475   24,621    
Commercial and industrial | Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 117   166    
Commercial and industrial | Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 49   688    
Commercial and industrial | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 25,347   31,193 44,804  
Other income producing property | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 178,238   175,848 150,928  
Other income producing property | Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 167,025   163,975    
Other income producing property | Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 9,280   8,047    
Other income producing property | Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 1,933   3,826    
Other income producing property | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Total loans 39,342   51,169 65,139  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 39,342   51,169    
Other income producing property | Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 38,361   49,783    
Other income producing property | Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 273   592    
Other income producing property | Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 708   794    
Consumer          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 59,300   70,734    
Consumer | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 8,513   10,703    
Consumer | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 19,685   23,331    
Consumer | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 31,102   36,700    
Consumer | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 324,238   233,104 189,317  
Consumer | Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 322,654   231,294    
Consumer | Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 468   771    
Consumer | Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 1,116   1,039    
Consumer | Non-acquired loans | All Consumer          
Loans and Allowance for Loan Losses          
Total loans 1,918,481   1,617,916    
Consumer | Non-acquired loans | All Consumer | Pass          
Loans and Allowance for Loan Losses          
Total loans 1,872,481   1,567,391    
Consumer | Non-acquired loans | All Consumer | Special mention          
Loans and Allowance for Loan Losses          
Total loans 23,896   26,719    
Consumer | Non-acquired loans | All Consumer | Substandard          
Loans and Allowance for Loan Losses          
Total loans 22,104   23,784    
Consumer | Non-acquired loans | All Consumer | Doubtful          
Loans and Allowance for Loan Losses          
Total loans     22    
Consumer | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Total loans 142,654   170,647 204,766  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 142,654   170,647    
Consumer | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 59,300   70,734    
Commercial | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 3,322,560   2,602,810    
Commercial | Non-acquired loans | Pass          
Loans and Allowance for Loan Losses          
Total loans 3,240,147   2,509,622    
Commercial | Non-acquired loans | Special mention          
Loans and Allowance for Loan Losses          
Total loans 65,593   69,542    
Commercial | Non-acquired loans | Substandard          
Loans and Allowance for Loan Losses          
Total loans 16,820   23,646    
Commercial | Acquired non-credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 124,896   169,816    
Commercial | Acquired non-credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 116,121   159,447    
Commercial | Acquired non-credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,814   1,881    
Commercial | Acquired non-credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,961   8,488    
Single pay loans | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance       86  
Other loans | Non-acquired loans          
Loans and Allowance for Loan Losses          
Total loans 13,404   46,573 45,222  
Commercial loans 1000000 or more | Acquired credit impaired loans          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 8,617   12,628 $ 15,813  
Commercial loans 1000000 or more | Acquired credit impaired loans | Pass          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 8,297   11,238    
Commercial loans 1000000 or more | Acquired credit impaired loans | Special mention          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance     1,018    
Commercial loans 1000000 or more | Acquired credit impaired loans | Substandard          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 320   372    
Commercial loans 1000000 or more | Acquired credit impaired loans | Doubtful          
Loans and Allowance for Loan Losses          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 8,617   $ 12,628