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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Allowance for loan losses:      
Charge-offs $ (1,686) $ (2,016)  
Recoveries 732 855  
Provision (benefit) 3,707 2,557  
Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 36,960 34,090  
Charge-offs (1,297) (1,719)  
Recoveries 669 764  
Provision (benefit) 2,117 1,980  
Balance at end of period 38,449 35,115  
Loans individually evaluated for impairment 1,658 1,699  
Loans collectively evaluated for impairment 36,791 33,416  
Loans:      
Loans individually evaluated for impairment 27,323 33,191  
Loans collectively evaluated for impairment 5,536,984 4,439,477  
Total loans 5,564,307 4,472,668 $ 5,241,041
Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (389) (297)  
Recoveries 63 91  
Provision (benefit) 326 206  
Loans:      
Loans collectively evaluated for impairment 1,715,642 999,238  
Total loans 1,715,642 999,238  
Commercial non-owner occupied real estate | Non-acquired loans      
Loans:      
Total loans 1,450,542 972,834 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 4,091 4,116  
Charge-offs (405)    
Recoveries 154 165  
Provision (benefit) 809 201  
Balance at end of period 4,649 4,482  
Loans individually evaluated for impairment 459 843  
Loans collectively evaluated for impairment 4,190 3,639  
Loans:      
Loans individually evaluated for impairment 9,286 6,271  
Loans collectively evaluated for impairment 637,258 440,926  
Total loans 646,544 447,197 580,464
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 4,980 3,568  
Recoveries 41 16  
Provision (benefit) 443 339  
Balance at end of period 5,464 3,923  
Loans individually evaluated for impairment 158 22  
Loans collectively evaluated for impairment 5,306 3,901  
Loans:      
Loans individually evaluated for impairment 775 1,135  
Loans collectively evaluated for impairment 803,223 524,502  
Total loans 803,998 525,637 714,715
Commercial non-owner occupied real estate | Acquired non-credit impaired loans      
Loans:      
Loans collectively evaluated for impairment 217,850 36,530  
Total loans 217,850 36,530  
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 141,897 13,024  
Total loans 141,897 13,024  
Commercial owner occupied real estate loan | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 8,022 8,341  
Charge-offs   (42)  
Recoveries 7 7  
Provision (benefit) (135) (127)  
Balance at end of period 7,894 8,179  
Loans individually evaluated for impairment 60 148  
Loans collectively evaluated for impairment 7,834 8,031  
Loans:      
Loans individually evaluated for impairment 6,251 7,701  
Loans collectively evaluated for impairment 1,193,753 1,052,812  
Total loans 1,200,004 1,060,513 1,177,745
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Loans:      
Loans collectively evaluated for impairment 238,612 37,356  
Total loans 238,612 37,356  
Consumer real estate | Non-acquired loans      
Loans:      
Total loans 1,649,456 1,386,516 1,580,839
Consumer real estate | Non-acquired loans | Home equity loans      
Allowance for loan losses:      
Balance at beginning of period 3,211 2,929  
Charge-offs (34) (443)  
Recoveries 74 88  
Provision (benefit) 205 523  
Balance at end of period 3,456 3,097  
Loans individually evaluated for impairment 297 79  
Loans collectively evaluated for impairment 3,159 3,018  
Loans:      
Loans individually evaluated for impairment 2,432 3,182  
Loans collectively evaluated for impairment 394,374 322,780  
Total loans 396,806 325,962 383,218
Consumer real estate | Non-acquired loans | Consumer      
Loans:      
Total loans 2,005,371 1,710,577 1,918,481
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Balance at beginning of period 7,820 7,212  
Charge-offs (123)    
Recoveries 49 81  
Provision (benefit) 362 52  
Balance at end of period 8,108 7,345  
Loans individually evaluated for impairment 68 148  
Loans collectively evaluated for impairment 8,040 7,197  
Loans:      
Loans individually evaluated for impairment 4,712 7,643  
Loans collectively evaluated for impairment 1,247,938 1,052,911  
Total loans 1,252,650 1,060,554 1,197,621
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Allowance for loan losses:      
Charge-offs   (144)  
Recoveries 9 85  
Provision (benefit) (9) 59  
Loans:      
Loans collectively evaluated for impairment 186,411 184,388  
Total loans 186,411 184,388  
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Charge-offs (313)    
Recoveries 39 3  
Provision (benefit) 274 (3)  
Loans:      
Loans collectively evaluated for impairment 550,578 494,472  
Total loans 550,578 494,472  
Commercial and industrial | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 4,842 3,974  
Charge-offs (22) (307)  
Recoveries 90 48  
Provision (benefit) 214 236  
Balance at end of period 5,124 3,951  
Loans individually evaluated for impairment 387 17  
Loans collectively evaluated for impairment 4,737 3,934  
Loans:      
Loans individually evaluated for impairment 1,270 877  
Loans collectively evaluated for impairment 724,704 552,650  
Total loans 725,974 553,527 671,398
Commercial and industrial | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (2) (3)  
Recoveries 1 1  
Provision (benefit) 1 2  
Loans:      
Loans collectively evaluated for impairment 136,309 21,109  
Total loans 136,309 21,109  
Other income producing property | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 1,542 1,963  
Recoveries 43 4  
Provision (benefit) (240) (165)  
Balance at end of period 1,345 1,802  
Loans individually evaluated for impairment 224 414  
Loans collectively evaluated for impairment 1,121 1,388  
Loans:      
Loans individually evaluated for impairment 2,408 5,394  
Loans collectively evaluated for impairment 180,008 169,823  
Total loans 182,416 175,217 178,238
Other income producing property | Acquired non-credit impaired loans      
Allowance for loan losses:      
Recoveries 1    
Provision (benefit) (1)    
Loans:      
Loans collectively evaluated for impairment 92,044 49,123  
Total loans 92,044 49,123  
Consumer | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 2,350 1,694  
Charge-offs (713) (927)  
Recoveries 211 355  
Provision (benefit) 595 663  
Balance at end of period 2,443 1,785  
Loans individually evaluated for impairment 5 4  
Loans collectively evaluated for impairment 2,438 1,781  
Loans:      
Loans individually evaluated for impairment 189 142  
Loans collectively evaluated for impairment 340,103 247,360  
Total loans 340,292 247,502 324,238
Consumer | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (74) (150)  
Recoveries 12 1  
Provision (benefit) 62 149  
Loans:      
Loans collectively evaluated for impairment 151,941 163,236  
Total loans 151,941 163,236  
Commercial | Non-acquired loans      
Loans:      
Total loans 3,558,936 2,762,091 3,322,560
Other loans | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 102 293  
Provision (benefit) (136) 258  
Balance at end of period (34) 551  
Loans individually evaluated for impairment   24  
Loans collectively evaluated for impairment (34)    
Loans collectively evaluated for impairment   527  
Loans:      
Loans individually evaluated for impairment   846  
Loans collectively evaluated for impairment 15,623 75,713  
Total loans $ 15,623 $ 76,559 $ 13,404