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Loans and Allowance for Loan Losses - Credit risk profile by risk grade of non acquired loans - (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans and Allowance for Loan Losses        
Other Real Estate, Non Covered $ 17,222 $ 11,203 $ 14,430 $ 18,316
Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 7,197,539 6,492,155 5,992,393  
Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 7,082,951 6,375,759 5,868,309  
Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 67,388 78,325 78,334  
Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 47,200 38,071 45,750  
Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 3,076,424 3,507,907 1,585,981  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,076,424 3,507,907 1,585,981  
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 3,006,269 3,438,030 1,549,504  
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 46,650 49,868 24,235  
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 23,505 20,009 12,242  
Acquired non-credit impaired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans     221,566  
Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 556,405 623,430 606,222  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 556,405 623,430 606,222  
Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 332,005 369,348 362,064  
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 90,293 106,723 105,987  
Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 134,107 147,359 138,171  
Residential real estate | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 229,502 260,787 256,602  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 229,502 260,787 256,602  
Residential real estate | Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 116,461 135,974 137,735  
Residential real estate | 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 46,089 54,500 52,250  
Residential real estate | Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 66,952 70,313 66,617  
Commercial non-owner occupied real estate | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 2,042,125 1,839,768 1,665,153  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 906,890 830,875 712,242  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Pass        
Loans and Allowance for Loan Losses        
Total loans 895,887 818,240 700,200  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Special mention        
Loans and Allowance for Loan Losses        
Total loans 7,858 8,758 8,133  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Substandard        
Loans and Allowance for Loan Losses        
Total loans 3,145 3,877 3,909  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 1,135,235 1,008,893 952,911  
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 1,126,099 999,049 939,254  
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 7,378 7,864 11,437  
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 1,758 1,980 2,220  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 281,282 403,357    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 281,282 403,357 112,855  
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 279,239 394,139 110,776  
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 1,449 4,602 1,290  
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 594 4,616 789  
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 752,465 817,166 209,560  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 752,465 817,166 209,560  
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 738,293 809,241 205,623  
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 14,164 7,913 3,856  
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 8 12 81  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 40,951 49,649 52,977  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 40,951 49,649 52,977  
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 25,243 29,620 31,656  
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 4,884 5,132 7,851  
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 10,824 14,897 13,470  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 227,739 234,595 214,795  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 227,739 234,595 214,795  
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 177,996 177,231 166,961  
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 22,568 28,708 23,162  
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 27,175 28,656 24,672  
Commercial owner occupied real estate loan | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 1,372,453 1,262,776 1,204,953  
Commercial owner occupied real estate loan | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,343,624 1,232,927 1,177,687  
Commercial owner occupied real estate loan | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 18,808 23,575 15,004  
Commercial owner occupied real estate loan | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 10,021 6,274 12,262  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 486,254 521,818    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 486,254 521,818 221,566  
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 479,399 513,861 217,392  
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 5,871 7,740 4,130  
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 984 217 44  
Consumer real estate | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 2,190,870 1,967,902 1,794,454  
Consumer real estate | Non-acquired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 456,946 437,642 411,532  
Consumer real estate | Non-acquired loans | Home equity loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 443,953 424,369 397,857  
Consumer real estate | Non-acquired loans | Home equity loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 6,805 6,749 7,207  
Consumer real estate | Non-acquired loans | Home equity loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 6,188 6,524 6,468  
Consumer real estate | Non-acquired loans | All Consumer        
Loans and Allowance for Loan Losses        
Total loans 2,636,387 2,380,577 2,170,378  
Consumer real estate | Non-acquired loans | All Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 2,594,447 2,337,500 2,128,733  
Consumer real estate | Non-acquired loans | All Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 19,994 20,964 21,208  
Consumer real estate | Non-acquired loans | All Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 21,946 22,113 20,437  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 1,733,924 1,530,260 1,382,922  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,706,574 1,502,016 1,356,469  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 12,566 13,902 13,653  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 14,784 14,342 12,800  
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 1,082,167 1,170,201 840,713  
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 1,052,395 1,141,218 822,506  
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 16,537 15,183 8,775  
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 13,235 13,800 9,432  
Consumer real estate | Acquired non-credit impaired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 278,906 320,591 177,129  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 278,906 320,591 177,129  
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 263,994 301,842 167,786  
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 8,319 10,477 4,906  
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 6,593 8,272 4,437  
Consumer real estate | Acquired non-credit impaired loans | Consumer        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 126,665 137,710 143,478  
Consumer real estate | Acquired non-credit impaired loans | Consumer | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 123,807 134,530 140,426  
Consumer real estate | Acquired non-credit impaired loans | Consumer | Special mention        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 723 541 1,172  
Consumer real estate | Acquired non-credit impaired loans | Consumer | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,135 2,639 1,880  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 676,596 710,611 520,106  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 676,596 710,611 520,106  
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 664,594 703,557 514,294  
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 7,495 4,165 2,697  
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 4,507 2,889 3,115  
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 45,633   56,362  
Commercial and industrial | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 941,067 815,187 762,583  
Commercial and industrial | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 923,995 801,885 741,605  
Commercial and industrial | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 8,522 11,130 15,916  
Commercial and industrial | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 8,550 2,172 5,062  
Commercial and industrial | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 304,864 398,696 117,884  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 304,864 398,696 117,884  
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 291,755 388,342 112,046  
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 5,248 9,883 4,642  
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 7,861 471 1,196  
Commercial and industrial | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans     112,855  
Commercial and industrial | Acquired non-credit impaired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans     117,884  
Commercial and industrial | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 12,580 26,946 25,486  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 12,580 26,946 25,486  
Commercial and industrial | Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,161 18,522 16,534  
Commercial and industrial | 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 1,139 1,169 4,188  
Commercial and industrial | Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 5,280 7,255 4,764  
Other income producing property | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 205,507 193,847 189,326  
Other income producing property | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 198,899 186,158 180,830  
Other income producing property | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 4,828 6,034 6,636  
Other income producing property | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 1,780 1,655 1,860  
Other income producing property | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 169,392 196,669 83,403  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 169,392 196,669 83,403  
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 165,188 191,229 81,161  
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 3,381 4,547 1,542  
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 823 893 700  
Consumer | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 416,650 378,985 357,761  
Consumer | Non-acquired loans | Consumer        
Loans and Allowance for Loan Losses        
Total loans 416,650 378,985 357,761  
Consumer | Non-acquired loans | Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 415,053 377,425 356,244  
Consumer | Non-acquired loans | Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 623 313 348  
Consumer | Non-acquired loans | Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 974 1,247 1,169  
Consumer | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 126,665 137,710 143,478  
Consumer | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 45,633 51,453 56,362  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 45,633 51,453 56,362  
Consumer | Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,144 8,001 9,178  
Consumer | 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 15,613 17,214 18,536  
Consumer | Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 23,876 26,238 28,648  
Commercial | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 4,561,152 4,111,578 3,822,015  
Commercial | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 4,488,504 4,038,259 3,739,576  
Commercial | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 47,394 57,361 57,126  
Commercial | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 25,254 15,958 25,313  
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 1,994,257 2,337,706 745,268  
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 1,953,874 2,296,812 726,998  
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 30,113 34,685 15,460  
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 10,270 6,209 2,810  
Commercial | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 281,282   112,855  
Commercial | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 486,254   221,566  
Other loans | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 28,867 33,690 18,163  
Other loans | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans $ 28,867 33,690 $ 18,163  
Other loans | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans   1,289    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance   1,289    
Other loans | 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   $ 1,289