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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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan losses:      
Charge-offs $ (6,779) $ (6,889) $ (8,967)
Recoveries 3,430 3,551 3,188
Provision (benefit) 11,890 6,819 5,864
Loans:      
Loans collectively evaluated for impairment 1,289    
Total loans 1,289    
Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 36,960 34,090 34,539
Charge-offs (5,149) (5,902) (6,180)
Recoveries 2,953 3,233 2,801
Provision (benefit) 8,684 5,539 2,930
Balance at end of period 43,448 36,960 34,090
Loans individually evaluated for impairment 1,624 1,337 1,607
Loans collectively evaluated for impairment 41,824 35,623 32,483
Loans:      
Loans individually evaluated for impairment 63,423 21,211 30,218
Loans collectively evaluated for impairment 6,428,732 5,219,830 4,190,508
Total loans 6,492,155 5,241,041 4,220,726
Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (1,630) (987) (2,787)
Recoveries 477 318 387
Provision (benefit) 1,153 669 2,400
Loans:      
Loans collectively evaluated for impairment 3,507,907 836,699 1,049,538
Total loans 3,507,907 836,699 1,049,538
Commercial non-owner occupied real estate | Non-acquired loans      
Loans:      
Total loans 1,839,768 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 5,666
Charge-offs (546) (159) (219)
Recoveries 968 912 376
Provision (benefit) 1,408 (778) (1,707)
Balance at end of period 5,921 4,091 4,116
Loans individually evaluated for impairment 1,063 348 615
Loans collectively evaluated for impairment 4,858 3,743 3,501
Loans:      
Loans individually evaluated for impairment 43,230 3,033 6,280
Loans collectively evaluated for impairment 787,645 577,431 395,699
Total loans 830,875 580,464 401,979
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 3,154
Charge-offs   (111) (156)
Recoveries 132 512 67
Provision (benefit) 1,413 1,011 503
Balance at end of period 6,525 4,980 3,568
Loans individually evaluated for impairment 125 170 34
Loans collectively evaluated for impairment 6,400 4,810 3,534
Loans:      
Loans individually evaluated for impairment 1,375 806 1,452
Loans collectively evaluated for impairment 1,007,518 713,909 486,325
Total loans 1,008,893 714,715 487,777
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Loans:      
Loans collectively evaluated for impairment 817,166 34,628 40,103
Total loans 817,166 34,628 40,103
Commercial owner occupied real estate loan | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 8,022 8,341 8,415
Charge-offs   (118) (851)
Recoveries 220 54 31
Provision (benefit) (114) (255) 746
Balance at end of period 8,128 8,022 8,341
Loans individually evaluated for impairment 64 67 101
Loans collectively evaluated for impairment 8,064 7,955 8,240
Loans:      
Loans individually evaluated for impairment 5,642 6,245 7,725
Loans collectively evaluated for impairment 1,257,134 1,171,500 1,025,673
Total loans 1,262,776 1,177,745 1,033,398
Consumer real estate | Non-acquired loans      
Loans:      
Total loans 1,967,902 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 2,829
Charge-offs (330) (808) (547)
Recoveries 210 299 244
Provision (benefit) 159 791 403
Balance at end of period 3,250 3,211 2,929
Loans individually evaluated for impairment 135 40 3
Loans collectively evaluated for impairment 3,115 3,171 2,926
Loans:      
Loans individually evaluated for impairment 3,011 1,674 309
Loans collectively evaluated for impairment 434,631 381,544 318,946
Total loans 437,642 383,218 319,255
Consumer real estate | Non-acquired loans | Other Consumer      
Loans:      
Total loans 33,690 13,404  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Balance at beginning of period 7,820 7,212 6,866
Charge-offs (185) (226) (374)
Recoveries 306 134 143
Provision (benefit) 1,727 700 577
Balance at end of period 9,668 7,820 7,212
Loans individually evaluated for impairment 37 80 138
Loans collectively evaluated for impairment 9,631 7,740 7,074
Loans:      
Loans individually evaluated for impairment 5,632 5,673 7,549
Loans collectively evaluated for impairment 1,524,628 1,191,948 1,011,435
Total loans 1,530,260 1,197,621 1,018,984
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Allowance for loan losses:      
Charge-offs (859) (428) (1,662)
Recoveries 393 199 237
Provision (benefit) 466 229 1,425
Loans:      
Loans collectively evaluated for impairment 320,591 160,879 190,968
Total loans 320,591 160,879 190,968
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Charge-offs (150)   (360)
Recoveries 41 12 102
Provision (benefit) 109 (12) 258
Loans:      
Loans collectively evaluated for impairment 710,611 408,270 518,107
Total loans 710,611 408,270 518,107
Commercial and industrial | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 4,842 3,974 3,561
Charge-offs (776) (876) (357)
Recoveries 343 292 844
Provision (benefit) 1,079 1,452 (74)
Balance at end of period 5,488 4,842 3,974
Loans individually evaluated for impairment 15 386 279
Loans collectively evaluated for impairment 5,473 4,456 3,695
Loans:      
Loans individually evaluated for impairment 1,156 1,263 1,487
Loans collectively evaluated for impairment 814,031 670,135 502,321
Total loans 815,187 671,398 503,808
Commercial and industrial | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (71) (66) (118)
Recoveries 6 9 19
Provision (benefit) 65 57 99
Loans:      
Loans collectively evaluated for impairment 398,696 13,641 25,475
Total loans 398,696 13,641 25,475
Other income producing property | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 1,542 1,963 2,232
Charge-offs (51) (7) (102)
Recoveries 85 87 85
Provision (benefit) (201) (501) (252)
Balance at end of period 1,375 1,542 1,963
Loans individually evaluated for impairment 178 242 422
Loans collectively evaluated for impairment 1,197 1,300 1,541
Loans:      
Loans individually evaluated for impairment 3,138 2,372 4,891
Loans collectively evaluated for impairment 190,709 175,866 170,957
Total loans 193,847 178,238 175,848
Other income producing property | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs     (4)
Recoveries 8 43 4
Provision (benefit) (8) (43)  
Loans:      
Loans collectively evaluated for impairment 196,669 39,342 51,169
Total loans 196,669 39,342 51,169
Consumer | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 2,350 1,694 1,367
Charge-offs (3,261) (3,597) (3,574)
Recoveries 689 943 1,011
Provision (benefit) 3,010 3,310 2,890
Balance at end of period 2,788 2,350 1,694
Loans individually evaluated for impairment 7 4 3
Loans collectively evaluated for impairment 2,781 2,346 1,691
Loans:      
Loans individually evaluated for impairment 239 145 102
Loans collectively evaluated for impairment 378,746 324,093 233,002
Total loans 378,985 324,238 233,104
Consumer | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (468) (532) (643)
Recoveries 23 51 21
Provision (benefit) 445 481 622
Loans:      
Loans collectively evaluated for impairment 137,710 142,654 170,647
Total loans 137,710 142,654 170,647
Commercial | Non-acquired loans      
Loans:      
Total loans 4,111,578 3,322,560  
Commercial | Acquired non-credit impaired loans | Construction and land development      
Allowance for loan losses:      
Charge-offs (82)    
Recoveries 4 4 4
Provision (benefit) 78 (4) (4)
Loans:      
Loans collectively evaluated for impairment 403,357 10,090 13,849
Total loans 403,357 10,090 13,849
Commercial | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Allowance for loan losses:      
Charge-offs (added back)   39  
Recoveries 2    
Provision (benefit) (2) (39)  
Loans:      
Loans collectively evaluated for impairment 521,818 27,195 39,220
Total loans 521,818 27,195 39,220
Other loans | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 102 293 449
Provision (benefit) 203 (191) (156)
Balance at end of period 305 102 293
Loans individually evaluated for impairment     12
Loans collectively evaluated for impairment 305 102 281
Loans:      
Loans individually evaluated for impairment     423
Loans collectively evaluated for impairment 33,690 13,404 46,150
Total loans $ 33,690 $ 13,404 $ 46,573