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Loans and Allowance for Loan Losses - Aging analysis of past due loans - (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and Allowance for Loan Losses      
Total loans $ 1,289    
Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 16,039 $ 15,345  
Current 6,476,116 5,225,696  
Total loans 6,492,155 5,241,041 $ 4,220,726
Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 6,640 6,223  
Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,863 3,302  
Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 7,536 5,820  
Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 36,513 24,066  
Current 586,917 581,875  
Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 10,810 6,887  
Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 8,998 2,356  
Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 16,705 14,823  
Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 19,608 4,484  
Current 3,488,299 832,215  
Total loans 3,507,907 836,699 1,049,538
Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 12,364 1,380  
Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,639 1,265  
Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,605 1,839  
Residential real estate | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 19,002 12,570  
Current 241,785 245,530  
Residential real estate | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 5,895 4,688  
Residential real estate | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,283 1,105  
Residential real estate | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 8,824 6,777  
Commercial non-owner occupied real estate | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 1,839,768 1,295,179  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 855 1,595  
Current 830,020 578,869  
Total loans 830,875 580,464 401,979
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 391 256  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 63 313  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 401 1,026  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 746 1,016  
Current 1,008,147 713,699  
Total loans 1,008,893 714,715 487,777
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 297 647  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 398 232  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 51 137  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 4,999 4,269  
Current 44,650 40,104  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 811 168  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 427 489  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,761 3,612  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 9,013 3,597  
Current 225,582 215,224  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,519 573  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,669 357  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,825 2,667  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 889 164  
Current 402,468 9,926  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 675 4  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 113    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 101 160  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 333    
Current 816,833 34,628  
Total loans 817,166 34,628 40,103
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 12    
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 321    
Commercial owner occupied real estate loan | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 4,330 3,707  
Current 1,258,446 1,174,038  
Total loans 1,262,776 1,177,745 1,033,398
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,227 1,272  
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 382 957  
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,721 1,478  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 831 106  
Current 520,987 27,089  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 642    
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 189 106  
Consumer real estate | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 1,967,902 1,580,839  
Consumer real estate | Non-acquired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 3,265 2,293  
Current 434,377 380,925  
Total loans 437,642 383,218 319,255
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,209 566  
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 372 889  
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,684 838  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 3,374 3,173  
Current 1,526,886 1,194,448  
Total loans 1,530,260 1,197,621 1,018,984
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,291 1,473  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 140 246  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,943 1,454  
Consumer real estate | Non-acquired loans | Other Consumer      
Loans and Allowance for Loan Losses      
Total loans 33,690 13,404  
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 5,952 2,158  
Current 314,639 158,721  
Total loans 320,591 160,879 190,968
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,639 476  
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 609 941  
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,704 741  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 1,744 699  
Current 708,867 407,571  
Total loans 710,611 408,270 518,107
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 673 330  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 204 113  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 867 256  
Commercial and industrial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,449 1,594  
Current 813,738 669,804  
Total loans 815,187 671,398 503,808
Commercial and industrial | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 477 1,033  
Commercial and industrial | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 57 216  
Commercial and industrial | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 915 345  
Commercial and industrial | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,169 606  
Current 25,777 24,741  
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 596 46  
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 167 24  
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 406 536  
Commercial and industrial | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 7,417 2  
Current 391,279 13,639  
Total loans 398,696 13,641 25,475
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 5,996 2  
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,278    
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 143    
Other income producing property | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 676 551  
Current 193,171 177,687  
Total loans 193,847 178,238 175,848
Other income producing property | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 223 310  
Other income producing property | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 255 94  
Other income producing property | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 198 147  
Other income producing property | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 577 132  
Current 196,092 39,210  
Total loans 196,669 39,342 51,169
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 327 131  
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due   1  
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 250    
Consumer | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,344 1,416  
Current 377,641 322,822  
Total loans 378,985 324,238 233,104
Consumer | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 525 666  
Consumer | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 196 355  
Consumer | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 623 395  
Consumer | Non-acquired loans | All Consumer      
Loans and Allowance for Loan Losses      
Total loans 2,380,577 1,918,481  
Consumer | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 2,330 3,024  
Current 49,123 56,276  
Consumer | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 989 1,412  
Consumer | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 452 381  
Consumer | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 889 1,231  
Consumer | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,865 1,223  
Current 135,845 141,431  
Total loans 137,710 142,654 170,647
Consumer | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 400 437  
Consumer | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 114 210  
Consumer | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,351 576  
Commercial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 4,111,578 3,322,560  
Commercial | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Total loans 403,357 10,090 13,849
Commercial | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Total loans 521,818 27,195 39,220
Other loans | Non-acquired loans      
Loans and Allowance for Loan Losses      
Current 33,690 13,404  
Total loans 33,690 $ 13,404 $ 46,573
Other loans | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Current $ 1,289