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Loans and Allowance for Loan Losses - Aging analysis of past due loans - (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due $ 17,809 $ 15,345 $ 16,360
Current 6,212,518 5,225,696 4,991,753
Total loans 6,230,327 5,241,041 5,008,113
Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 7,953 6,223 6,380
Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,245 3,302 3,524
Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 5,611 5,820 6,456
Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 23,968 24,066 22,679
Current 558,565 581,875 613,341
Total loans 582,533   636,020
Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 6,632 6,887 6,556
Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,218 2,356 4,586
Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 13,118 14,823 11,537
Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 11,247 4,484 4,675
Current 1,444,308 832,215 880,982
Total loans 1,455,555   885,657
Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 4,986 1,380 1,663
Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,628 1,265 859
Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,633 1,839 2,153
Residential real estate | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 13,506 12,570 11,992
Current 236,160 245,530 256,976
Total loans 249,666   268,968
Residential real estate | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 3,608 4,688 4,260
Residential real estate | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 2,750 1,105 2,015
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 7,148 6,777 5,717
Commercial non-owner occupied real estate | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 1,716,827 1,295,179 1,192,773
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 1,287 1,595 1,876
Current 765,670 578,869 560,460
Total loans 766,957 580,464 562,336
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 728 256 548
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 76 313 249
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 483 1,026 1,079
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate      
Loans and Allowance for Loan Losses      
Past due 678 1,016 1,630
Current 949,192 713,699 628,807
Total loans 949,870 714,715 630,437
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 26 647 655
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 567 232 768
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 85 137 207
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 3,495 4,269 3,374
Current 42,753 40,104 43,707
Total loans 46,248   47,081
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 22 168 266
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 234 489 1,971
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 3,239 3,612 1,137
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 3,849 3,597 3,947
Current 195,233 206,607 216,542
Total loans 199,082   220,489
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 2,018 573 896
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 404 357 238
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 1,427 2,667 2,813
Commercial non-owner occupied real estate | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Total loans 199,704   35,775
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Loans and Allowance for Loan Losses      
Past due 541 164 165
Current 76,345 9,926 10,518
Total loans 76,886   10,683
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 117 4 5
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    
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 225 160 160
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 618   28
Current 199,086 34,628 35,747
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 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     28
Commercial owner occupied real estate loan | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 4,506 3,707 3,133
Current 1,273,981 1,174,038 1,150,347
Total loans 1,278,487 1,177,745 1,153,480
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 2,382 1,272 1,795
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 300 957 71
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 1,824 1,478 1,267
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,320 106 738
Current 206,252 27,089 28,706
Total loans 207,572   29,444
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 330   326
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 97   110
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 893 106 302
Consumer real estate | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 1,874,518 1,580,839 1,547,266
Consumer real estate | Non-acquired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 2,618 2,293 2,018
Current 417,142 380,925 361,807
Total loans 419,760 383,218 363,825
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 841 566 1,000
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 416 889 186
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 1,361 838 832
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 5,174 3,173 4,125
Current 1,449,584 1,194,448 1,179,316
Total loans 1,454,758 1,197,621 1,183,441
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 2,587 1,473 1,549
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 1,514 246 894
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 1,073 1,454 1,682
Consumer real estate | Non-acquired loans | Consumer      
Loans and Allowance for Loan Losses      
Total loans 2,258,921 1,918,481 1,864,740
Consumer real estate | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Total loans 53,302   61,866
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Loans and Allowance for Loan Losses      
Past due 2,694 2,158 1,847
Current 161,597 158,721 166,911
Total loans 164,291   168,758
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 1,240 476 719
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 455 941 207
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 999 741 921
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans and Allowance for Loan Losses      
Past due 2,700 699 778
Current 489,915 407,571 434,354
Total loans 492,615   435,132
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 1,404 330 140
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 535 113 417
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 761 256 221
Commercial and industrial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 2,026 1,594 1,642
Current 779,731 669,804 615,883
Total loans 781,757 671,398 617,525
Commercial and industrial | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 772 1,033 229
Commercial and industrial | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 1,162 216 739
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 92 345 674
Commercial and industrial | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,246 606 677
Current 24,550 24,741 25,981
Total loans 25,796   26,658
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 314 46 10
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 571 24 30
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 361 536 637
Commercial and industrial | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,311 2 38
Current 100,116 13,639 14,163
Total loans 101,427   14,201
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 749 2 38
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 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 98    
Other income producing property | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 428 551 918
Current 193,907 177,687 178,677
Total loans 194,335 178,238 179,595
Other income producing property | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 76 310 318
Other income producing property | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 100 94 187
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 252 147 413
Other income producing property | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 265 132 26
Current 76,659 39,210 43,126
Total loans 76,924   43,152
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 164 131 26
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 64 1  
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 37    
Consumer | Non-acquired loans      
Loans and Allowance for Loan Losses      
Past due 1,092 1,416 1,018
Current 370,666 322,822 304,669
Total loans 371,758 324,238 305,687
Consumer | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 541 666 286
Consumer | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 110 355 430
Consumer | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 441 395 302
Consumer | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,872 3,024 2,689
Current 51,430 56,276 59,177
Consumer | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 670 1,412 1,124
Consumer | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 259 381 332
Consumer | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 943 1,231 1,233
Consumer | Acquired non-credit impaired loans      
Loans and Allowance for Loan Losses      
Past due 1,798 1,223 1,055
Current 134,338 141,431 147,457
Total loans 136,136   148,512
Consumer | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 364 437 409
Consumer | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans and Allowance for Loan Losses      
Past due 814 210 97
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 620 576 549
Commercial | Non-acquired loans      
Loans and Allowance for Loan Losses      
Total loans 3,971,406 3,322,560 3,143,373
Other loans | Non-acquired loans      
Loans and Allowance for Loan Losses      
Current 12,645 13,404 11,787
Total loans 12,645 13,404 11,787
Commercial loans 1000000 or more | Acquired credit impaired loans      
Loans and Allowance for Loan Losses      
Current 8,439 $ 8,617 10,958
Total loans $ 8,439   $ 10,958