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Loans and Allowance for Loan Losses - Aging analysis of past due loans - (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due $ 15,273 $ 16,039 $ 14,313
Current 6,747,239 6,476,116 5,549,994
Total loans 6,762,512 6,492,155 5,564,307
Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 5,538 6,640 5,374
Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,652 1,863 3,501
Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 7,083 7,536 5,438
Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 40,523 36,513 32,450
Current 560,835 586,917 599,446
Total loans 601,358 623,430 631,896
Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 11,448 10,810 7,848
Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 8,952 8,998 3,783
Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 20,123 16,705 20,819
Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 14,734 19,608 10,784
Current 3,260,204 3,488,299 1,704,858
Total loans 3,274,938 3,507,907 1,715,642
Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 8,743 12,364 7,441
Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,258 2,639 1,049
Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,733 4,605 2,294
Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due     1,212
Current     237,400
Total loans     238,612
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     1,069
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     143
Residential real estate | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 16,158 19,002 14,612
Current 232,608 241,785 251,872
Total loans 248,766 260,787 266,484
Residential real estate | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,497 5,895 4,226
Residential real estate | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,063 4,283 1,809
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 8,598 8,824 8,577
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      
Past due 810 855 916
Current 870,331 830,020 645,628
Total loans 871,141 830,875 646,544
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 673 391 345
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 4 63 100
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 133 401 471
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 816 746 1,727
Current 1,050,108 1,008,147 802,271
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 | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 89 297 759
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 20 398 664
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 707 51 304
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 3,812 4,999 5,199
Current 42,407 44,650 52,144
Total loans 46,219 49,649 57,343
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 53 811 877
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 321 427 17
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,438 3,761 4,305
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 17,575 9,013 7,199
Current 215,702 225,582 215,957
Total loans 233,277 234,595 223,156
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 6,043 2,519 1,482
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 5,293 3,669 1,733
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 6,239 2,825 3,984
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 2,191 889  
Current 347,341 402,468  
Total loans 349,532 403,357  
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 1,788 675  
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 115 113  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 288 101  
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 376 333 26
Current 783,090 816,833 217,824
Total loans 783,466 817,166 217,850
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 242 12 26
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due   321  
Commercial non-owner occupied real estate | Acquired non-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 134    
Commercial owner occupied real estate loan | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 3,493 4,330 5,174
Current 1,293,245 1,258,446 1,194,830
Total loans 1,296,738 1,262,776 1,200,004
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 573 2,227 1,811
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 1,218 382 1,988
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,702 1,721 1,375
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,142 831  
Current 497,399 520,987  
Total loans 498,541 521,818  
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 1,142 642  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due   189  
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      
Past due 2,940 3,265 2,179
Current 445,642 434,377 394,627
Total loans 448,582 437,642 396,806
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,452 1,209 434
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 65 372 341
Consumer real estate | Non-acquired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,423 1,684 1,404
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 3,473 3,374 2,100
Current 1,609,028 1,526,886 1,250,550
Total loans 1,612,501 1,530,260 1,252,650
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,274 1,291 1,076
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 601 140 31
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,598 1,943 993
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 | Acquired non-credit impaired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 4,839 5,952 2,274
Current 290,882 314,639 184,137
Total loans 295,721 320,591 186,411
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,881 3,639 823
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 833 609 318
Consumer real estate | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,125 1,704 1,133
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 2,166 1,744 2,213
Current 681,448 708,867 548,365
Total loans 683,614 710,611 550,578
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,304 673 1,293
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 76 204 482
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 786 867 438
Commercial and industrial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 2,358 1,449 699
Current 870,005 813,738 725,275
Total loans 872,363 815,187 725,974
Commercial and industrial | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 983 477 366
Commercial and industrial | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 476 57 159
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 899 915 174
Commercial and industrial | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 875 1,169 3,353
Current 23,420 25,777 22,872
Total loans 24,295 26,946 26,225
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 55 596 504
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due   167  
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 820 406 2,849
Commercial and industrial | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 2,112 7,417  
Current 342,059 391,279  
Total loans 344,171 398,696 136,309
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 1,998 5,996  
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 27 1,278  
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 87 143  
Commercial and industrial | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due     578
Current     141,319
Total loans     141,897
Commercial and industrial | 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     386
Commercial and industrial | 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     32
Commercial and industrial | 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     160
Commercial and industrial | Acquired non-credit impaired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due     3,484
Current     132,825
Total loans     136,309
Commercial and industrial | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due     3,484
Other income producing property | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 593 676 604
Current 198,091 193,171 181,812
Total loans 198,684 193,847 182,416
Other income producing property | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 360 223 310
Other income producing property | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 108 255 104
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 125 198 190
Other income producing property | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 365 577 227
Current 185,726 196,092 91,817
Total loans 186,091 196,669 92,044
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 101 327 192
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 69    
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 195 250 35
Consumer | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 790 1,344 914
Current 389,994 377,641 339,378
Total loans 390,784 378,985 340,292
Consumer | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 134 525 273
Consumer | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 160 196 114
Consumer | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 496 623 527
Consumer | Non-acquired loans | Consumer      
Loans and Allowance for Loan Losses      
Total loans 390,784 378,985 340,292
Consumer | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 2,103 2,330 2,087
Current 46,698 49,123 56,601
Total loans 48,801 51,453 58,688
Consumer | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 800 989 759
Consumer | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 275 452 224
Consumer | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,028 889 1,104
Consumer | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,543 1,865 770
Current 132,259 135,845 151,171
Total loans 133,802 137,710 151,941
Consumer | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 287 400 168
Consumer | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 138 114 74
Consumer | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,118 1,351 528
Commercial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 4,289,850 4,111,578 3,558,936
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      
Current 20,795 33,690 15,623
Total loans $ 20,795 33,690 $ 15,623
Other loans | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Current   1,289  
Total loans   $ 1,289