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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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Allowance for loan losses:      
Charge-offs $ (1,503) $ (1,686)  
Recoveries 967 732  
Provision (benefit) 2,454 3,707  
Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 43,448 36,960  
Charge-offs (1,169) (1,297)  
Recoveries 802 669  
Provision (benefit) 2,122 2,117  
Balance at end of period 45,203 38,449  
Loans individually evaluated for impairment 1,712 1,658  
Loans collectively evaluated for impairment 43,491 36,791  
Loans:      
Loans individually evaluated for impairment 66,696 27,323  
Loans collectively evaluated for impairment 6,695,816 5,536,984  
Total loans 6,762,512 5,564,307 $ 6,492,155
Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (334) (389)  
Recoveries 165 63  
Provision (benefit) 169 326  
Loans:      
Loans collectively evaluated for impairment 3,274,938 1,715,642  
Total loans 3,274,938 1,715,642 3,507,907
Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Loans:      
Total loans   238,612  
Commercial non-owner occupied real estate | Non-acquired loans      
Loans:      
Total loans 1,922,065 1,450,542 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 5,921 4,091  
Charge-offs (35) (405)  
Recoveries 442 154  
Provision (benefit) (481) 809  
Balance at end of period 5,847 4,649  
Loans individually evaluated for impairment 767 459  
Loans collectively evaluated for impairment 5,080 4,190  
Loans:      
Loans individually evaluated for impairment 46,198 9,286  
Loans collectively evaluated for impairment 824,943 637,258  
Total loans 871,141 646,544 830,875
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 6,525 4,980  
Recoveries 2 41  
Provision (benefit) 271 443  
Balance at end of period 6,798 5,464  
Loans individually evaluated for impairment 110 158  
Loans collectively evaluated for impairment 6,688 5,306  
Loans:      
Loans individually evaluated for impairment 1,181 775  
Loans collectively evaluated for impairment 1,049,743 803,223  
Total loans 1,050,924 803,998 1,008,893
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Loans:      
Total loans 349,532   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 783,466 217,850  
Total loans 783,466 217,850 817,166
Commercial owner occupied real estate loan | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 8,128 8,022  
Recoveries 8 7  
Provision (benefit) 210 (135)  
Balance at end of period 8,346 7,894  
Loans individually evaluated for impairment 63 60  
Loans collectively evaluated for impairment 8,283 7,834  
Loans:      
Loans individually evaluated for impairment 5,578 6,251  
Loans collectively evaluated for impairment 1,291,160 1,193,753  
Total loans 1,296,738 1,200,004 1,262,776
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans:      
Total loans 498,541   521,818
Consumer real estate | Non-acquired loans      
Loans:      
Total loans 2,061,083 1,649,456 1,967,902
Consumer real estate | Non-acquired loans | Home equity loans      
Allowance for loan losses:      
Balance at beginning of period 3,250 3,211  
Charge-offs (66) (34)  
Recoveries 101 74  
Provision (benefit) (48) 205  
Balance at end of period 3,237 3,456  
Loans individually evaluated for impairment 73 297  
Loans collectively evaluated for impairment 3,164 3,159  
Loans:      
Loans individually evaluated for impairment 3,168 2,432  
Loans collectively evaluated for impairment 445,414 394,374  
Total loans 448,582 396,806 437,642
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Balance at beginning of period 9,668 7,820  
Charge-offs (4) (123)  
Recoveries 23 49  
Provision (benefit) 506 362  
Balance at end of period 10,193 8,108  
Loans individually evaluated for impairment 35 68  
Loans collectively evaluated for impairment 10,158 8,040  
Loans:      
Loans individually evaluated for impairment 5,493 4,712  
Loans collectively evaluated for impairment 1,607,008 1,247,938  
Total loans 1,612,501 1,252,650 1,530,260
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Allowance for loan losses:      
Charge-offs (82)    
Recoveries 51 9  
Provision (benefit) 31 (9)  
Loans:      
Loans collectively evaluated for impairment 295,721 186,411  
Total loans 295,721 186,411 320,591
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Charge-offs   (313)  
Charge-offs (added back) (70)    
Recoveries 57 39  
Provision (benefit) 13 274  
Loans:      
Loans collectively evaluated for impairment 683,614 550,578  
Total loans 683,614 550,578 710,611
Commercial and industrial | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 5,488 4,842  
Charge-offs (85) (22)  
Recoveries 15 90  
Provision (benefit) 915 214  
Balance at end of period 6,333 5,124  
Loans individually evaluated for impairment 489 387  
Loans collectively evaluated for impairment 5,844 4,737  
Loans:      
Loans individually evaluated for impairment 1,677 1,270  
Loans collectively evaluated for impairment 870,686 724,704  
Total loans 872,363 725,974 815,187
Commercial and industrial | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (43) (2)  
Recoveries 53 1  
Provision (benefit) (10) 1  
Loans:      
Loans collectively evaluated for impairment 344,171 136,309  
Total loans 344,171 136,309 398,696
Commercial and industrial | Acquired non-credit impaired loans | Construction and land development      
Loans:      
Total loans   141,897  
Commercial and industrial | Acquired non-credit impaired loans | Home equity loans      
Loans:      
Total loans   136,309  
Other income producing property | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 1,375 1,542  
Recoveries 8 43  
Provision (benefit) 10 (240)  
Balance at end of period 1,393 1,345  
Loans individually evaluated for impairment 166 224  
Loans collectively evaluated for impairment 1,227 1,121  
Loans:      
Loans individually evaluated for impairment 3,086 2,408  
Loans collectively evaluated for impairment 195,598 180,008  
Total loans 198,684 182,416 193,847
Other income producing property | Acquired non-credit impaired loans      
Allowance for loan losses:      
Recoveries   1  
Provision (benefit)   (1)  
Loans:      
Loans collectively evaluated for impairment 186,091 92,044  
Total loans 186,091 92,044 196,669
Consumer | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 2,788 2,350  
Charge-offs (979) (713)  
Recoveries 203 211  
Provision (benefit) 887 595  
Balance at end of period 2,899 2,443  
Loans individually evaluated for impairment 9 5  
Loans collectively evaluated for impairment 2,890 2,438  
Loans:      
Loans individually evaluated for impairment 315 189  
Loans collectively evaluated for impairment 390,469 340,103  
Total loans 390,784 340,292 378,985
Consumer | Non-acquired loans | Consumer      
Loans:      
Total loans 390,784 340,292 378,985
Consumer | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (138) (74)  
Recoveries 3 12  
Provision (benefit) 135 62  
Loans:      
Loans collectively evaluated for impairment 133,802 151,941  
Total loans 133,802 151,941 137,710
Commercial | Non-acquired loans      
Loans:      
Total loans 4,289,850 3,558,936 4,111,578
Commercial | Acquired non-credit impaired loans | Construction and land development      
Allowance for loan losses:      
Charge-offs (1)    
Recoveries 1 1  
Provision (benefit)   (1)  
Loans:      
Loans collectively evaluated for impairment 349,532 141,897  
Total loans 349,532 141,897  
Commercial | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Loans:      
Loans collectively evaluated for impairment 498,541 238,612  
Total loans 498,541 238,612  
Other loans | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 305 102  
Provision (benefit) (148) (136)  
Balance at end of period 157 (34)  
Loans collectively evaluated for impairment 157 (34)  
Loans:      
Loans collectively evaluated for impairment 20,795 15,623  
Total loans $ 20,795 $ 15,623 33,690
Other loans | Acquired non-credit impaired loans      
Loans:      
Total loans     $ 1,289