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Loans and Allowance for Loan Losses - Disaggregated analysis of activity in for allowances for non acquired loans - (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allowance for loan losses:          
Charge-offs $ (1,988) $ (1,658) $ (5,914) $ (5,137)  
Recoveries 582 1,115 2,687 2,455  
Provision (benefit) 3,117 2,062 10,049 8,082  
Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 47,874 40,149 43,448 36,960  
Charge-offs (1,891) (1,383) (4,300) (3,972)  
Recoveries 555 836 2,408 2,041  
Provision (benefit) 3,331 1,939 8,313 6,512  
Balance at end of period 49,869 41,541 49,869 41,541  
Loans individually evaluated for impairment 1,657 1,862 1,657 1,862  
Loans collectively evaluated for impairment 48,212 39,679 48,212 39,679  
Loans:          
Loans individually evaluated for impairment 54,640 60,792 54,640 60,792  
Loans collectively evaluated for impairment 7,551,838 6,169,535 7,551,838 6,169,535  
Total loans 7,606,478 6,230,327 7,606,478 6,230,327 $ 6,492,155
Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (97) (275) (1,614) (1,165)  
Recoveries 27 279 279 414  
Provision (benefit) 70 (4) 1,335 751  
Loans:          
Loans collectively evaluated for impairment 2,786,102 1,455,555 2,786,102 1,455,555  
Total loans 2,786,102 1,455,555 2,786,102 1,455,555 3,507,907
Commercial non-owner occupied real estate | Non-acquired loans          
Loans:          
Total loans 2,182,164 1,716,827 2,182,164 1,716,827 1,839,768
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development          
Allowance for loan losses:          
Balance at beginning of period 6,187 5,746 5,921 4,091  
Charge-offs   (19) (35) (493)  
Recoveries 178 333 1,167 555  
Provision (benefit) (352) (88) (1,040) 1,819  
Balance at end of period 6,013 5,972 6,013 5,972  
Loans individually evaluated for impairment 723 1,266 723 1,266  
Loans collectively evaluated for impairment 5,290 4,706 5,290 4,706  
Loans:          
Loans individually evaluated for impairment 35,776 42,638 35,776 42,638  
Loans collectively evaluated for impairment 867,060 724,319 867,060 724,319  
Total loans 902,836 766,957 902,836 766,957 830,875
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate          
Allowance for loan losses:          
Balance at beginning of period 7,209 6,164 6,525 4,980  
Recoveries 2 80 6 128  
Provision (benefit) 774 (7) 1,454 1,129  
Balance at end of period 7,985 6,237 7,985 6,237  
Loans individually evaluated for impairment 81 133 81 133  
Loans collectively evaluated for impairment 7,904 6,104 7,904 6,104  
Loans:          
Loans individually evaluated for impairment 1,315 716 1,315 716  
Loans collectively evaluated for impairment 1,278,013 949,154 1,278,013 949,154  
Total loans 1,279,328 949,870 1,279,328 949,870 1,008,893
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development          
Allowance for loan losses:          
Charge-offs     (106)    
Recoveries 1 1 8 3  
Provision (benefit) (1) (1) 98 (3)  
Loans:          
Loans collectively evaluated for impairment 222,562 76,886 222,562 76,886  
Total loans 222,562 76,886 222,562 76,886 403,357
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate          
Loans:          
Loans collectively evaluated for impairment 684,793 199,704 684,793 199,704  
Total loans 684,793 199,704 684,793 199,704 817,166
Commercial owner occupied real estate loan | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 8,607 7,539 8,128 8,022  
Charge-offs (578)   (659)    
Recoveries 105 92 76 197  
Provision (benefit) 943 479 1,532 (109)  
Balance at end of period 9,077 8,110 9,077 8,110  
Loans individually evaluated for impairment 40 64 40 64  
Loans collectively evaluated for impairment 9,037 8,046 9,037 8,046  
Loans:          
Loans individually evaluated for impairment 4,551 5,874 4,551 5,874  
Loans collectively evaluated for impairment 1,444,518 1,272,613 1,444,518 1,272,613  
Total loans 1,449,069 1,278,487 1,449,069 1,278,487 1,262,776
Commercial owner occupied real estate loan | Non-acquired loans | Home equity loans          
Allowance for loan losses:          
Balance at beginning of period     3,250 3,211  
Charge-offs     (111) (241)  
Recoveries     139 133  
Provision (benefit)     163 (6)  
Balance at end of period 3,441 3,097 3,441 3,097  
Commercial owner occupied real estate loan | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs     (28)    
Recoveries   1   1  
Provision (benefit)   (1) 28 (1)  
Loans:          
Loans collectively evaluated for impairment 455,803 207,572 455,803 207,572  
Total loans 455,803 207,572 455,803 207,572 521,818
Consumer loans | Non-acquired loans          
Loans:          
Total loans 2,317,584 1,874,518 2,317,584 1,874,518 1,967,902
Consumer loans | Non-acquired loans | Home equity loans          
Allowance for loan losses:          
Balance at beginning of period 3,368 3,247      
Charge-offs (40) (17)      
Recoveries 11 38      
Provision (benefit) 102 (171)      
Balance at end of period 3,441 3,097 3,441 3,097  
Loans individually evaluated for impairment 171 116 171 116  
Loans collectively evaluated for impairment 3,270 2,981 3,270 2,981  
Loans:          
Loans individually evaluated for impairment 3,026 2,623 3,026 2,623  
Loans collectively evaluated for impairment 470,355 417,137 470,355 417,137  
Total loans 473,381 419,760 473,381 419,760 437,642
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Balance at beginning of period 10,945 8,569 9,668 7,820  
Charge-offs (76)   (80) (185)  
Recoveries 43 65 169 141  
Provision (benefit) 468 492 1,623 1,350  
Balance at end of period 11,380 9,126 11,380 9,126  
Loans individually evaluated for impairment 28 47 28 47  
Loans collectively evaluated for impairment 11,352 9,079 11,352 9,079  
Loans:          
Loans individually evaluated for impairment 5,420 4,455 5,420 4,455  
Loans collectively evaluated for impairment 1,838,783 1,450,303 1,838,783 1,450,303  
Total loans 1,844,203 1,454,758 1,844,203 1,454,758 1,530,260
Consumer loans | Acquired non-credit impaired loans | Home equity loans          
Allowance for loan losses:          
Charge-offs (4) (71) (244) (736)  
Recoveries 6 274 85 343  
Provision (benefit) (2) (203) 159 393  
Loans:          
Loans collectively evaluated for impairment 259,558 164,291 259,558 164,291  
Total loans 259,558 164,291 259,558 164,291 320,591
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Charge-offs   (80) (70) (89)  
Recoveries 1   63 42  
Provision (benefit) (1) 80 7 47  
Loans:          
Loans collectively evaluated for impairment 647,064 492,615 647,064 492,615  
Total loans 647,064 492,615 647,064 492,615 710,611
Commercial and industrial | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 6,711 5,143 5,488 4,842  
Charge-offs (34) (440) (178) (629)  
Recoveries 27 31 241 264  
Provision (benefit) 219 469 1,372 726  
Balance at end of period 6,923 5,203 6,923 5,203  
Loans individually evaluated for impairment 475 18 475 18  
Loans collectively evaluated for impairment 6,448 5,185 6,448 5,185  
Loans:          
Loans individually evaluated for impairment 1,409 627 1,409 627  
Loans collectively evaluated for impairment 990,433 781,130 990,433 781,130  
Total loans 991,842 781,757 991,842 781,757 815,187
Commercial and industrial | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (30) (1) (838) (3)  
Recoveries 5 1 60 3  
Provision (benefit) 25   778    
Loans:          
Loans collectively evaluated for impairment 247,922 101,427 247,922 101,427  
Total loans 247,922 101,427 247,922 101,427 398,696
Other income producing property | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 1,413 1,379 1,375 1,542  
Charge-offs   (10)   (17)  
Recoveries 3 29 14 77  
Provision (benefit) (6) (10) 21 (214)  
Balance at end of period 1,410 1,388 1,410 1,388  
Loans individually evaluated for impairment 133 211 133 211  
Loans collectively evaluated for impairment 1,277 1,177 1,277 1,177  
Loans:          
Loans individually evaluated for impairment 2,930 3,605 2,930 3,605  
Loans collectively evaluated for impairment 207,053 190,730 207,053 190,730  
Total loans 209,983 194,335 209,983 194,335 193,847
Other income producing property | Acquired non-credit impaired loans          
Allowance for loan losses:          
Recoveries       1  
Provision (benefit)       (1)  
Loans:          
Loans collectively evaluated for impairment 150,371 76,924 150,371 76,924  
Total loans 150,371 76,924 150,371 76,924 196,669
Consumer | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 3,071 2,532 2,788 2,350  
Charge-offs (1,163) (897) (3,237) (2,407)  
Recoveries 186 168 596 546  
Provision (benefit) 1,089 889 3,036 2,203  
Balance at end of period 3,183 2,692 3,183 2,692  
Loans individually evaluated for impairment 6 7 6 7  
Loans collectively evaluated for impairment 3,177 2,685 3,177 2,685  
Loans:          
Loans individually evaluated for impairment 213 254 213 254  
Loans collectively evaluated for impairment 438,576 371,504 438,576 371,504  
Total loans 438,789 371,758 438,789 371,758 378,985
Consumer | Non-acquired loans | Consumer          
Loans:          
Total loans 438,789 371,758 438,789 371,758 378,985
Consumer | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (63) (123) (328) (337)  
Recoveries 14 2 63 21  
Provision (benefit) 49 121 265 316  
Loans:          
Loans collectively evaluated for impairment 118,029 136,136 118,029 136,136  
Total loans 118,029 136,136 118,029 136,136 137,710
Commercial loans | Non-acquired loans          
Loans:          
Total loans 4,833,058 3,971,406 4,833,058 3,971,406 4,111,578
Other loans | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 363 (170) 305 102  
Provision (benefit) 94 (114) 152 (386)  
Balance at end of period 457 (284) 457 (284)  
Loans collectively evaluated for impairment   (284)   (284)  
Loans collectively evaluated for impairment 457   457    
Loans:          
Loans collectively evaluated for impairment 17,047 12,645 17,047 12,645  
Total loans $ 17,047 $ 12,645 $ 17,047 $ 12,645 33,690
Other loans | Acquired non-credit impaired loans          
Loans:          
Total loans         $ 1,289