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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Allowance for loan losses:          
Charge-offs $ (1,658) $ (1,388) $ (5,137) $ (5,194)  
Recoveries 1,115 833 2,455 2,620  
Provision (benefit) 2,062 912 8,082 6,198  
Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 40,149 36,939 36,960 34,090  
Charge-offs (1,383) (1,108) (3,972) (4,384)  
Recoveries 836 713 2,041 2,358  
Provision (benefit) 1,939 775 6,512 5,255  
Balance at end of period 41,541 37,319 41,541 37,319  
Loans individually evaluated for impairment 1,862 1,379 1,862 1,379  
Loans collectively evaluated for impairment 39,679 35,940 39,679 35,940  
Loans:          
Loans individually evaluated for impairment 60,792 21,187 60,792 21,187  
Loans collectively evaluated for impairment 6,169,535 4,986,926 6,169,535 4,986,926  
Total loans 6,230,327 5,008,113 6,230,327 5,008,113 $ 5,241,041
Non-acquired loans | Other commercial non-owner occupied real estate          
Allowance for loan losses:          
Balance at beginning of period     4,980 3,568  
Recoveries     128 59  
Provision (benefit)     1,129 964  
Balance at end of period 6,237 4,591 6,237 4,591  
Non-acquired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Balance at beginning of period     8,022 8,341  
Charge-offs       (117)  
Recoveries     197 46  
Provision (benefit)     (109) 258  
Balance at end of period 8,110 8,528 8,110 8,528  
Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (275) (280) (1,165) (810)  
Recoveries 279 120 414 262  
Provision (benefit) (4) 160 751 548  
Loans:          
Loans collectively evaluated for impairment 1,455,555 885,657 1,455,555 885,657  
Total loans 1,455,555 885,657 1,455,555 885,657  
Commercial non-owner occupied real estate | Non-acquired loans          
Loans:          
Total loans 1,716,827 1,192,773 1,716,827 1,192,773 1,295,179
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development          
Allowance for loan losses:          
Balance at beginning of period 5,746 4,665      
Charge-offs (19)        
Recoveries 333 241      
Provision (benefit) (88) (795)      
Balance at end of period 5,972 4,111 5,972 4,111  
Loans individually evaluated for impairment 1,266 359 1,266 359  
Loans collectively evaluated for impairment 4,706 3,752 4,706 3,752  
Loans:          
Loans individually evaluated for impairment 42,638 3,431 42,638 3,431  
Loans collectively evaluated for impairment 724,319 558,905 724,319 558,905  
Total loans 766,957 562,336 766,957 562,336 580,464
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 6,164 4,656      
Recoveries 80 28      
Provision (benefit) (7) (93)      
Balance at end of period 6,237 4,591 6,237 4,591  
Loans individually evaluated for impairment 133 181 133 181  
Loans collectively evaluated for impairment 6,104 4,410 6,104 4,410  
Loans:          
Loans individually evaluated for impairment 716 764 716 764  
Loans collectively evaluated for impairment 949,154 629,673 949,154 629,673  
Total loans 949,870 630,437 949,870 630,437 714,715
Commercial non-owner occupied real estate | Acquired non-credit impaired loans          
Loans:          
Loans collectively evaluated for impairment 199,704 35,775 199,704 35,775  
Total loans 199,704 35,775 199,704 35,775  
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development          
Allowance for loan losses:          
Recoveries 1 1      
Provision (benefit) (1) (1)      
Loans:          
Loans collectively evaluated for impairment 76,886 10,683 76,886 10,683  
Total loans 76,886 10,683 76,886 10,683  
Commercial owner occupied real estate loan | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 7,539 8,003      
Charge-offs   (16)      
Recoveries 92 25      
Provision (benefit) 479 516      
Balance at end of period 8,110 8,528 8,110 8,528  
Loans individually evaluated for impairment 64 65 64 65  
Loans collectively evaluated for impairment 8,046 8,463 8,046 8,463  
Loans:          
Loans individually evaluated for impairment 5,874 6,352 5,874 6,352  
Loans collectively evaluated for impairment 1,272,613 1,147,128 1,272,613 1,147,128  
Total loans 1,278,487 1,153,480 1,278,487 1,153,480 1,177,745
Commercial owner occupied real estate loan | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs   (3)   (3)  
Recoveries 1   1    
Provision (benefit) (1) 3 (1) 3  
Loans:          
Loans collectively evaluated for impairment 207,572 29,444 207,572 29,444  
Total loans 207,572 29,444 207,572 29,444  
Consumer real estate | Non-acquired loans          
Loans:          
Total loans 1,874,518 1,547,266 1,874,518 1,547,266 1,580,839
Consumer real estate | Non-acquired loans | Home equity loans          
Allowance for loan losses:          
Balance at beginning of period 3,247 3,148      
Charge-offs (17)        
Recoveries 38 64      
Provision (benefit) (171) 69      
Balance at end of period 3,097 3,281 3,097 3,281  
Loans individually evaluated for impairment 116 38 116 38  
Loans collectively evaluated for impairment 2,981 3,243 2,981 3,243  
Loans:          
Loans individually evaluated for impairment 2,623 1,599 2,623 1,599  
Loans collectively evaluated for impairment 417,137 362,226 417,137 362,226  
Total loans 419,760 363,825 419,760 363,825 383,218
Consumer real estate | Non-acquired loans | Consumer          
Loans:          
Total loans 2,258,921 1,864,740 2,258,921 1,864,740 1,918,481
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Balance at beginning of period 8,569 7,530      
Charge-offs   (45)      
Recoveries 65 27      
Provision (benefit) 492 338      
Balance at end of period 9,126 7,850 9,126 7,850  
Loans individually evaluated for impairment 47 58 47 58  
Loans collectively evaluated for impairment 9,079 7,792 9,079 7,792  
Loans:          
Loans individually evaluated for impairment 4,455 3,127 4,455 3,127  
Loans collectively evaluated for impairment 1,450,303 1,180,314 1,450,303 1,180,314  
Total loans 1,454,758 1,183,441 1,454,758 1,183,441 1,197,621
Consumer real estate | Acquired non-credit impaired loans | Home equity loans          
Allowance for loan losses:          
Charge-offs (71) (105)      
Recoveries 274 89      
Provision (benefit) (203) 16      
Loans:          
Loans collectively evaluated for impairment 164,291 168,758 164,291 168,758  
Total loans 164,291 168,758 164,291 168,758  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Charge-offs (added back) (80)        
Recoveries   3      
Provision (benefit) 80 (3)      
Loans:          
Loans collectively evaluated for impairment 492,615 435,132 492,615 435,132  
Total loans 492,615 435,132 492,615 435,132  
Commercial and industrial | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 5,143 4,269 4,842 3,974  
Charge-offs (440) (31) (629) (358)  
Recoveries 31 104 264 207  
Provision (benefit) 469 368 726 887  
Balance at end of period 5,203 4,710 5,203 4,710  
Loans individually evaluated for impairment 18 385 18 385  
Loans collectively evaluated for impairment 5,185 4,325 5,185 4,325  
Loans:          
Loans individually evaluated for impairment 627 1,453 627 1,453  
Loans collectively evaluated for impairment 781,130 616,072 781,130 616,072  
Total loans 781,757 617,525 781,757 617,525 671,398
Commercial and industrial | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (1) (23) (3) (30)  
Recoveries 1 1 3 3  
Provision (benefit)   22   27  
Loans:          
Loans collectively evaluated for impairment 101,427 14,201 101,427 14,201  
Total loans 101,427 14,201 101,427 14,201  
Other income producing property | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 1,379 1,812 1,542 1,963  
Charge-offs (10)   (17) (7)  
Recoveries 29 8 77 47  
Provision (benefit) (10) (201) (214) (384)  
Balance at end of period 1,388 1,619 1,388 1,619  
Loans individually evaluated for impairment 211 289 211 289  
Loans collectively evaluated for impairment 1,177 1,330 1,177 1,330  
Loans:          
Loans individually evaluated for impairment 3,605 4,319 3,605 4,319  
Loans collectively evaluated for impairment 190,730 175,276 190,730 175,276  
Total loans 194,335 179,595 194,335 179,595 178,238
Other income producing property | Acquired non-credit impaired loans          
Allowance for loan losses:          
Recoveries     1 1  
Provision (benefit)     (1) (1)  
Loans:          
Loans collectively evaluated for impairment 76,924 43,152 76,924 43,152  
Total loans 76,924 43,152 76,924 43,152  
Consumer | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period 2,532 2,014      
Charge-offs (897) (1,016)      
Recoveries 168 216      
Provision (benefit) 889 1,094      
Balance at end of period 2,692 2,308 2,692 2,308  
Loans individually evaluated for impairment 7 4 7 4  
Loans collectively evaluated for impairment 2,685 2,304 2,685 2,304  
Loans:          
Loans individually evaluated for impairment 254 142 254 142  
Loans collectively evaluated for impairment 371,504 305,545 371,504 305,545  
Total loans 371,758 305,687 371,758 305,687 324,238
Consumer | Non-acquired loans | Home equity loans          
Allowance for loan losses:          
Balance at beginning of period     3,211 2,929  
Charge-offs     (241) (767)  
Recoveries     133 239  
Provision (benefit)     (6) 880  
Balance at end of period 3,097 3,281 3,097 3,281  
Consumer | Non-acquired loans | Consumer          
Allowance for loan losses:          
Balance at beginning of period     2,350 1,694  
Charge-offs     (2,407) (2,802)  
Recoveries     546 787  
Provision (benefit)     2,203 2,629  
Balance at end of period 2,692 2,308 2,692 2,308  
Consumer | Non-acquired loans | Other Consumer          
Allowance for loan losses:          
Balance at beginning of period     102 293  
Provision (benefit)     (386) 28  
Balance at end of period (284) 321 (284) 321  
Consumer | Non-acquired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Balance at beginning of period     7,820 7,212  
Charge-offs     (185) (174)  
Recoveries     141 125  
Provision (benefit)     1,350 687  
Balance at end of period 9,126 7,850 9,126 7,850  
Consumer | Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs (123) (149) (337) (485)  
Recoveries 2 26 21 49  
Provision (benefit) 121 123 316 436  
Loans:          
Loans collectively evaluated for impairment 136,136 148,512 136,136 148,512  
Total loans 136,136 148,512 136,136 148,512  
Consumer | Acquired non-credit impaired loans | Home equity loans          
Allowance for loan losses:          
Charge-offs     (736) (292)  
Recoveries     343 197  
Provision (benefit)     393 95  
Consumer | Acquired non-credit impaired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Charge-offs     (89)    
Recoveries     42 9  
Provision (benefit)     47 (9)  
Commercial | Non-acquired loans          
Loans:          
Total loans 3,971,406 3,143,373 3,971,406 3,143,373 3,322,560
Commercial | Non-acquired loans | Construction and land development          
Allowance for loan losses:          
Balance at beginning of period     4,091 4,116  
Charge-offs     (493) (159)  
Recoveries     555 848  
Provision (benefit)     1,819 (694)  
Balance at end of period 5,972 4,111 5,972 4,111  
Commercial | Acquired non-credit impaired loans | Construction and land development          
Allowance for loan losses:          
Recoveries     3 3  
Provision (benefit)     (3) (3)  
Other loans | Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period (170) 842      
Provision (benefit) (114) (521)      
Balance at end of period (284) 321 (284) 321  
Loans collectively evaluated for impairment (284)   (284)    
Loans collectively evaluated for impairment   321   321  
Loans:          
Loans collectively evaluated for impairment 12,645 11,787 12,645 11,787  
Total loans $ 12,645 $ 11,787 $ 12,645 $ 11,787 $ 13,404