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Loans and Allowance for Loan Losses - Credit risk profile by risk grade of non acquired loans - (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans and Allowance for Loan Losses        
Other Real Estate, Non Covered $ 11,073 $ 11,203 $ 20,007 $ 18,316
Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 6,762,512 6,492,155 5,564,307  
Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 6,645,048 6,375,759 5,432,278  
Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 79,619 78,325 85,425  
Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 37,845 38,071 46,604  
Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 3,274,938 3,507,907 1,715,642  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,274,938 3,507,907 1,715,642  
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 3,207,265 3,438,030 1,680,567  
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 45,043 49,868 24,404  
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 22,630 20,009 10,671  
Acquired non-credit impaired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans     238,612  
Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 601,358 623,430 631,896  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 601,358 623,430 631,896  
Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 354,448 369,348 368,200  
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 97,510 106,723 116,837  
Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 149,400 147,359 146,859  
Residential real estate | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 248,766 260,787 266,484  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 248,766 260,787 266,484  
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 129,952 135,974 142,847  
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 50,845 54,500 53,539  
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 67,969 70,313 70,098  
Commercial non-owner occupied real estate | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 1,922,065 1,839,768 1,450,542  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 871,141 830,875 646,544  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Pass        
Loans and Allowance for Loan Losses        
Total loans 857,307 818,240 633,953  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Special mention        
Loans and Allowance for Loan Losses        
Total loans 10,499 8,758 8,868  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Substandard        
Loans and Allowance for Loan Losses        
Total loans 3,335 3,877 3,723  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 1,050,924 1,008,893 803,998  
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 1,040,669 999,049 790,687  
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 8,497 7,864 11,233  
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 2,078  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 349,532 403,357    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 349,532 403,357 141,897  
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 345,635 394,139 139,748  
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 2,892 4,602 1,316  
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 1,005 4,616 833  
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 783,466 817,166 217,850  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 783,466 817,166 217,850  
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 775,924 809,241 213,827  
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 7,533 7,913 3,937  
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 9 12 86  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 46,219 49,649 57,343  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 46,219 49,649 57,343  
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 28,501 29,620 28,157  
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 4,654 5,132 15,117  
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 13,064 14,897 14,069  
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 233,277 234,595 223,156  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 233,277 234,595 223,156  
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 171,585 177,231 170,623  
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 24,550 28,708 24,412  
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 37,142 28,656 28,121  
Commercial owner occupied real estate loan | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 1,296,738 1,262,776 1,200,004  
Commercial owner occupied real estate loan | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,267,759 1,232,927 1,167,531  
Commercial owner occupied real estate loan | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 22,619 23,575 20,277  
Commercial owner occupied real estate loan | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 6,360 6,274 12,196  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 498,541 521,818    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 498,541 521,818 238,612  
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 490,089 513,861 233,397  
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 8,254 7,740 5,057  
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 198 217 158  
Consumer real estate | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 2,061,083 1,967,902 1,649,456  
Consumer real estate | Non-acquired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 448,582 437,642 396,806  
Consumer real estate | Non-acquired loans | Home equity loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 435,282 424,369 382,387  
Consumer real estate | Non-acquired loans | Home equity loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 6,767 6,749 7,597  
Consumer real estate | Non-acquired loans | Home equity loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 6,533 6,524 6,822  
Consumer real estate | Non-acquired loans | All Consumer        
Loans and Allowance for Loan Losses        
Total loans 2,472,662 2,380,577 2,005,371  
Consumer real estate | Non-acquired loans | All Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 2,429,890 2,337,500 1,962,039  
Consumer real estate | Non-acquired loans | All Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 20,397 20,964 22,125  
Consumer real estate | Non-acquired loans | All Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 22,375 22,113 21,207  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 1,612,501 1,530,260 1,252,650  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,584,427 1,502,016 1,225,556  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 13,329 13,902 13,903  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 14,745 14,342 13,191  
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 1,113,137 1,170,201 888,930  
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 1,087,383 1,141,218 871,525  
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 13,946 15,183 8,566  
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 11,808 13,800 8,839  
Consumer real estate | Acquired non-credit impaired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 295,721 320,591 186,411  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 295,721 320,591 186,411  
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 279,487 301,842 176,678  
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 8,942 10,477 4,700  
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 7,292 8,272 5,033  
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 133,802 137,710 151,941  
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 130,915 134,530 148,798  
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 520 541 1,243  
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 2,367 2,639 1,900  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 683,614 710,611 550,578  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 683,614 710,611 550,578  
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 676,981 703,557 546,049  
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 4,484 4,165 2,623  
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 2,149 2,889 1,906  
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 48,801   58,688  
Commercial and industrial | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 872,363 815,187 725,974  
Commercial and industrial | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 857,567 801,885 703,747  
Commercial and industrial | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 12,286 11,130 16,746  
Commercial and industrial | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 2,510 2,172 5,481  
Commercial and industrial | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 344,171 398,696 136,309  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 344,171 398,696 136,309  
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 327,409 388,342 132,474  
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 8,049 9,883 3,787  
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 8,713 471 48  
Commercial and industrial | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans     141,897  
Commercial and industrial | Acquired non-credit impaired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans     136,309  
Commercial and industrial | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 24,295 26,946 26,225  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 24,295 26,946 26,225  
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 17,163 18,522 16,869  
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 1,132 1,169 4,645  
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 6,000 7,255 4,711  
Other income producing property | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 198,684 193,847 182,416  
Other income producing property | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 191,856 186,158 174,321  
Other income producing property | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 5,321 6,034 6,176  
Other income producing property | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 1,507 1,655 1,919  
Other income producing property | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 186,091 196,669 92,044  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 186,091 196,669 92,044  
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 180,825 191,229 89,596  
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 4,369 4,547 1,741  
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 897 893 707  
Consumer | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 390,784 378,985 340,292  
Consumer | Non-acquired loans | Consumer        
Loans and Allowance for Loan Losses        
Total loans 390,784 378,985 340,292  
Consumer | Non-acquired loans | Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 389,386 377,425 338,473  
Consumer | Non-acquired loans | Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 301 313 625  
Consumer | Non-acquired loans | Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 1,097 1,247 1,194  
Consumer | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 133,802 137,710 151,941  
Consumer | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 48,801 51,453 58,688  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 48,801 51,453 58,688  
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 7,247 8,001 9,704  
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 16,329 17,214 19,124  
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 25,225 26,238 29,860  
Commercial | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 4,289,850 4,111,578 3,558,936  
Commercial | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 4,215,158 4,038,259 3,470,239  
Commercial | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 59,222 57,361 63,300  
Commercial | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 15,470 15,958 25,397  
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 2,161,801 2,337,706 826,712  
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 2,119,882 2,296,812 809,042  
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 31,097 34,685 15,838  
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 10,822 6,209 1,832  
Commercial | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 349,532   141,897  
Commercial | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 498,541   238,612  
Other loans | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 20,795 33,690 15,623  
Other loans | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans $ 20,795 33,690 $ 15,623  
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