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Loans and Allowance for Loan Losses - Aging analysis of past due loans - (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due $ 16,624 $ 16,039 $ 17,809
Current 7,589,854 6,476,116 6,212,518
Total loans 7,606,478 6,492,155 6,230,327
Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 8,677 6,640 7,953
Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,814 1,863 4,245
Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 5,133 7,536 5,611
Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 32,277 36,513 23,968
Current 484,324 586,917 558,565
Total loans 516,601 623,430 582,533
Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 12,087 10,810 6,632
Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,327 8,998 4,218
Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 17,863 16,705 13,118
Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 15,354 19,608 11,247
Current 2,770,748 3,488,299 1,444,308
Total loans 2,786,102 3,507,907 1,455,555
Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 7,809 12,364 4,986
Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,607 2,639 2,628
Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,938 4,605 3,633
Residential real estate | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 16,269 19,002 13,506
Current 201,750 241,785 236,160
Total loans 218,019 260,787 249,666
Residential real estate | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 6,506 5,895 3,608
Residential real estate | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,392 4,283 2,750
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 8,371 8,824 7,148
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      
Past due 1,149 855 1,287
Current 901,687 830,020 765,670
Total loans 902,836 830,875 766,957
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 535 391 728
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 537 63 76
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 77 401 483
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 1,142 746 678
Current 1,278,186 1,008,147 949,192
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 | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 466 297 26
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   398 567
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 676 51 85
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 3,982 4,999 3,495
Current 30,330 44,650 42,753
Total loans 34,312 49,649 46,248
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 768 811 22
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 309 427 234
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 2,905 3,761 3,239
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 7,500 9,013 3,849
Current 202,018 225,582 203,672
Total loans 209,518 234,595 207,521
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 1,517 2,519 2,018
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 375 3,669 404
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 5,608 2,825 1,427
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 578 889 541
Current 221,984 402,468 76,345
Total loans 222,562 403,357 76,886
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 6 675 117
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 199 113 199
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 373 101 225
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 3,979 333 618
Current 680,814 816,833 199,086
Total loans 684,793 817,166 199,704
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 3,931 12 618
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 48 321  
Commercial owner occupied real estate loan | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 4,682 4,330 4,506
Current 1,444,387 1,258,446 1,273,981
Total loans 1,449,069 1,262,776 1,278,487
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 2,562 2,227 2,382
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 1,249 382 300
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 871 1,721 1,824
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,473 831 1,320
Current 454,330 520,987 206,252
Total loans 455,803 521,818 207,572
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 564 642 330
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 198   97
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 711 189 893
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      
Past due 2,712 3,265 2,618
Current 470,669 434,377 417,142
Total loans 473,381 437,642 419,760
Consumer loans | Non-acquired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,667 1,209 841
Consumer loans | Non-acquired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 296 372 416
Consumer loans | 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 749 1,684 1,361
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 2,050 3,374 5,174
Current 1,842,153 1,526,886 1,449,584
Total loans 1,844,203 1,530,260 1,454,758
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 866 1,291 2,587
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 264 140 1,514
Consumer loans | 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 920 1,943 1,073
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 | Acquired non-credit impaired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 4,243 5,952 2,694
Current 255,315 314,639 161,597
Total loans 259,558 320,591 164,291
Consumer loans | 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 1,295 3,639 1,240
Consumer loans | 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 527 609 455
Consumer loans | 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 2,421 1,704 999
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 1,532 1,744 2,700
Current 645,532 708,867 489,915
Total loans 647,064 710,611 492,615
Consumer loans | 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 552 673 1,404
Consumer loans | 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 405 204 535
Consumer loans | 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 575 867 761
Commercial and industrial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,918 1,449 2,026
Current 989,924 813,738 779,731
Total loans 991,842 815,187 781,757
Commercial and industrial | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 716 477 772
Commercial and industrial | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 297 57 1,162
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 905 915 92
Commercial and industrial | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 2,796 1,169 1,246
Current 7,875 25,777 24,550
Total loans 10,671 26,946 25,796
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,625 596 314
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 83 167 571
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 88 406 361
Commercial and industrial | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 969 7,417 1,311
Current 246,953 391,279 100,116
Total loans 247,922 398,696 101,427
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 116 5,996 749
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 589 1,278 464
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 264 143 98
Other income producing property | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,412 676 428
Current 208,571 193,171 193,907
Total loans 209,983 193,847 194,335
Other income producing property | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,163 223 76
Other income producing property | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due   255 100
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 249 198 252
Other income producing property | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,276 577 265
Current 149,095 196,092 76,659
Total loans 150,371 196,669 76,924
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 804 327 164
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 343   64
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 129 250 37
Consumer | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,559 1,344 1,092
Current 437,230 377,641 370,666
Total loans 438,789 378,985 371,758
Consumer | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 702 525 541
Consumer | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 171 196 110
Consumer | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 686 623 441
Consumer | Non-acquired loans | Consumer      
Loans and Allowance for Loan Losses      
Total loans 438,789 378,985 371,758
Consumer | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,730 2,330 1,872
Current 42,351 49,123 51,430
Total loans 44,081 51,453 53,302
Consumer | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 671 989 670
Consumer | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 168 452 259
Consumer | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 891 889 943
Consumer | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,304 1,865 1,798
Current 116,725 135,845 134,338
Total loans 118,029 137,710 136,136
Consumer | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 541 400 364
Consumer | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 298 114 814
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 465 1,351 620
Commercial loans | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 4,833,058 4,111,578 3,971,406
Other loans | Non-acquired loans      
Loans and Allowance for Loan Losses      
Current 17,047 33,690 12,645
Total loans $ 17,047 33,690 $ 12,645
Other loans | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Current   1,289  
Total loans   $ 1,289