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Loans and Allowance for Loan Losses - Credit risk profile by risk grade of non acquired loans - (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Loans and Allowance for Loan Losses        
Other Real Estate, Non Covered $ 12,119 $ 11,203 $ 13,527 $ 18,316
Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 7,606,478 6,492,155 6,230,327  
Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 7,487,440 6,375,759 6,116,379  
Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 71,106 78,325 77,757  
Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 47,932 38,071 36,191  
Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 2,786,102 3,507,907 1,455,555  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,786,102 3,507,907 1,455,555  
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 2,716,956 3,438,030 1,417,304  
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 52,428 49,868 24,570  
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 16,718 20,009 13,681  
Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 516,601 623,430 582,533  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 516,601 623,430 582,533  
Acquired credit impaired loans | Pass        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 305,676 369,348 345,076  
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 84,007 106,723 98,711  
Acquired credit impaired loans | Substandard        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 126,918 147,359 138,746  
Residential real estate | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 218,019 260,787 249,666  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 218,019 260,787 249,666  
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 109,004 135,974 133,969  
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 42,834 54,500 50,488  
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 66,181 70,313 65,209  
Commercial non-owner occupied real estate | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 2,182,164 1,839,768 1,716,827  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 902,836 830,875 766,957  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Pass        
Loans and Allowance for Loan Losses        
Total loans 889,818 818,240 755,633  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Special mention        
Loans and Allowance for Loan Losses        
Total loans 9,906 8,758 7,445  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Substandard        
Loans and Allowance for Loan Losses        
Total loans 3,112 3,877 3,879  
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate        
Loans and Allowance for Loan Losses        
Total loans 1,279,328 1,008,893 949,870  
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 1,270,557 999,049 939,125  
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 7,027 7,864 8,475  
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 1,744 1,980 2,270  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 222,562 403,357 76,886  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 222,562 403,357 76,886  
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 221,034 394,139 74,665  
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 921 4,602 1,403  
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 607 4,616 818  
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 684,793 817,166 199,704  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 684,793 817,166 199,704  
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 670,176 809,241 195,808  
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 14,612 7,913 3,806  
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 5 12 90  
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development        
Loans and Allowance for Loan Losses        
Total loans 34,312 49,649 46,248  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 34,312 49,649 46,248  
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 20,796 29,620 26,666  
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 3,165 5,132 6,455  
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 10,351 14,897 13,127  
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 209,518 234,595 207,521  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 209,518 234,595 207,521  
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 164,435 177,231 160,425  
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 22,629 28,708 22,638  
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 22,454 28,656 24,458  
Commercial owner occupied real estate loan | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 1,449,069 1,262,776 1,278,487  
Commercial owner occupied real estate loan | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,421,090 1,232,927 1,247,881  
Commercial owner occupied real estate loan | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 18,337 23,575 24,277  
Commercial owner occupied real estate loan | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 9,642 6,274 6,329  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 455,803 521,818 207,572  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 455,803 521,818 207,572  
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 447,877 513,861 201,498  
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 6,933 7,740 4,048  
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 993 217 2,026  
Consumer loans | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 2,317,584 1,967,902 1,874,518  
Consumer loans | Non-acquired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 473,381 437,642 419,760  
Consumer loans | Non-acquired loans | Home equity loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 460,720 424,369 405,945  
Consumer loans | Non-acquired loans | Home equity loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 6,037 6,749 7,346  
Consumer loans | Non-acquired loans | Home equity loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 6,624 6,524 6,469  
Consumer loans | Non-acquired loans | All Consumer        
Loans and Allowance for Loan Losses        
Total loans 2,773,420 2,380,577 2,258,921  
Consumer loans | Non-acquired loans | All Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 2,731,545 2,337,500 2,216,126  
Consumer loans | Non-acquired loans | All Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 18,168 20,964 22,576  
Consumer loans | Non-acquired loans | All Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 23,707 22,113 20,219  
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 1,844,203 1,530,260 1,454,758  
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 1,816,735 1,502,016 1,427,278  
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 11,614 13,902 14,914  
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 15,854 14,342 12,566  
Consumer loans | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,024,651 1,170,201 793,042  
Consumer 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 994,614 1,141,218 774,816  
Consumer loans | 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 16,120 15,183 8,720  
Consumer loans | 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 13,917 13,800 9,506  
Consumer loans | Acquired non-credit impaired loans | Home equity loans        
Loans and Allowance for Loan Losses        
Total loans 259,558 320,591 164,291  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 259,558 320,591 164,291  
Consumer loans | 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 244,017 301,842 154,461  
Consumer loans | 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 8,089 10,477 5,077  
Consumer loans | 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 7,452 8,272 4,753  
Consumer loans | 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 118,029 137,710 136,136  
Consumer loans | 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 115,154 134,530 132,962  
Consumer loans | 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 619 541 1,141  
Consumer loans | 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 2,256 2,639 2,033  
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans        
Loans and Allowance for Loan Losses        
Total loans 647,064 710,611 492,615  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 647,064 710,611 492,615  
Consumer loans | 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 635,443 703,557 487,393  
Consumer loans | 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 7,412 4,165 2,502  
Consumer loans | 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 4,209 2,889 2,720  
Consumer loans | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 44,081   53,302  
Commercial and industrial | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 991,842 815,187 781,757  
Commercial and industrial | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 970,586 801,885 770,975  
Commercial and industrial | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 12,997 11,130 8,894  
Commercial and industrial | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 8,259 2,172 1,888  
Commercial and industrial | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 247,922 398,696 101,427  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 247,922 398,696 101,427  
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 239,906 388,342 95,523  
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 7,634 9,883 5,385  
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 382 471 519  
Commercial and industrial | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 10,671 26,946 25,796  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 10,671 26,946 25,796  
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 5,514 18,522 15,755  
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 584 1,169 1,397  
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 4,573 7,255 8,644  
Other income producing property | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 209,983 193,847 194,335  
Other income producing property | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 203,844 186,158 186,639  
Other income producing property | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 4,671 6,034 6,090  
Other income producing property | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 1,468 1,655 1,606  
Other income producing property | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 150,371 196,669 76,924  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 150,371 196,669 76,924  
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 143,349 191,229 74,994  
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 6,208 4,547 1,208  
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 814 893 722  
Consumer | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 438,789 378,985 371,758  
Consumer | Non-acquired loans | Consumer        
Loans and Allowance for Loan Losses        
Total loans 438,789 378,985 371,758  
Consumer | Non-acquired loans | Consumer | Pass        
Loans and Allowance for Loan Losses        
Total loans 437,043 377,425 370,258  
Consumer | Non-acquired loans | Consumer | Special mention        
Loans and Allowance for Loan Losses        
Total loans 517 313 316  
Consumer | Non-acquired loans | Consumer | Substandard        
Loans and Allowance for Loan Losses        
Total loans 1,229 1,247 1,184  
Consumer | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 118,029 137,710 136,136  
Consumer | Acquired credit impaired loans        
Loans and Allowance for Loan Losses        
Total loans 44,081 51,453 53,302  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 44,081 51,453 53,302  
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 5,927 8,001 8,261  
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 14,795 17,214 17,733  
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 23,359 26,238 27,308  
Commercial loans | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 4,833,058 4,111,578 3,971,406  
Commercial loans | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans 4,755,895 4,038,259 3,900,253  
Commercial loans | Non-acquired loans | Special mention        
Loans and Allowance for Loan Losses        
Total loans 52,938 57,361 55,181  
Commercial loans | Non-acquired loans | Substandard        
Loans and Allowance for Loan Losses        
Total loans 24,225 15,958 15,972  
Commercial loans | Acquired non-credit impaired loans        
Loans and Allowance for Loan Losses        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,761,451 2,337,706 662,513  
Commercial 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 1,722,342 2,296,812 642,488  
Commercial loans | 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 36,308 34,685 15,850  
Commercial loans | 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 2,801 6,209 4,175  
Other loans | Non-acquired loans        
Loans and Allowance for Loan Losses        
Total loans 17,047 33,690 12,645  
Other loans | Non-acquired loans | Pass        
Loans and Allowance for Loan Losses        
Total loans $ 17,047 33,690 $ 12,645  
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