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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses:      
Charge-offs $ (6,889) $ (8,967) $ (9,047)
Recoveries 3,551 3,188 3,178
Provision (benefit) 6,819 5,864 6,590
Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 34,090 34,539 34,331
Charge-offs (5,902) (6,180) (7,516)
Recoveries 3,233 2,801 2,574
Provision (benefit) 5,539 2,930 5,150
Balance at end of period 36,960 34,090 34,539
Loans individually evaluated for impairment 1,337 1,607 1,558
Loans collectively evaluated for impairment 35,623 32,483 32,981
Loans:      
Loans individually evaluated for impairment 21,211 30,218 27,085
Loans collectively evaluated for impairment 5,219,830 4,190,508 3,440,741
Total loans 5,241,041 4,220,726 3,467,826
Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (987) (2,787) (1,531)
Recoveries 318 387 604
Provision (benefit) 669 2,400 927
Loans:      
Loans collectively evaluated for impairment 836,699 1,049,538 1,327,999
Total loans 836,699 1,049,538 1,327,999
Commercial non-owner occupied real estate | Non-acquired loans      
Loans:      
Total loans 1,295,179 889,756  
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development      
Allowance for loan losses:      
Balance at beginning of period 4,116 5,666 6,789
Charge-offs (159) (219) (237)
Recoveries 912 376 421
Provision (benefit) (778) (1,707) (1,307)
Balance at end of period 4,091 4,116 5,666
Loans individually evaluated for impairment 348 615 475
Loans collectively evaluated for impairment 3,743 3,501 5,191
Loans:      
Loans individually evaluated for impairment 3,033 6,280 4,852
Loans collectively evaluated for impairment 577,431 395,699 359,369
Total loans 580,464 401,979 364,221
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 3,568 3,154 3,677
Charge-offs (111) (156) (442)
Recoveries 512 67 390
Provision (benefit) 1,011 503 (471)
Balance at end of period 4,980 3,568 3,154
Loans individually evaluated for impairment 170 34 77
Loans collectively evaluated for impairment 4,810 3,534 3,077
Loans:      
Loans individually evaluated for impairment 806 1,452 3,610
Loans collectively evaluated for impairment 713,909 486,325 329,980
Total loans 714,715 487,777 333,590
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development      
Allowance for loan losses:      
Charge-offs     (78)
Recoveries 4 4 1
Provision (benefit) (4) (4) 77
Loans:      
Loans collectively evaluated for impairment 10,090 13,849 24,099
Total loans 10,090 13,849 24,099
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate      
Allowance for loan losses:      
Charge-offs     (72)
Provision (benefit)     72
Loans:      
Loans collectively evaluated for impairment 34,628 40,103 49,476
Total loans 34,628 40,103 49,476
Commercial owner occupied real estate loan | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 8,341 8,415 7,767
Charge-offs (118) (851) (531)
Recoveries 54 31 95
Provision (benefit) (255) 746 1,084
Balance at end of period 8,022 8,341 8,415
Loans individually evaluated for impairment 67 101 172
Loans collectively evaluated for impairment 7,955 8,240 8,243
Loans:      
Loans individually evaluated for impairment 6,245 7,725 9,160
Loans collectively evaluated for impairment 1,171,500 1,025,673 898,753
Total loans 1,177,745 1,033,398 907,913
Commercial owner occupied real estate loan | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (added back) 39    
Provision (benefit) (39)    
Loans:      
Loans collectively evaluated for impairment 27,195 39,220 62,065
Total loans 27,195 39,220 62,065
Consumer real estate | Non-acquired loans      
Loans:      
Total loans 1,580,839 1,338,239  
Consumer real estate | Non-acquired loans | Home equity loans      
Allowance for loan losses:      
Balance at beginning of period 2,929 2,829 2,782
Charge-offs (808) (547) (1,000)
Recoveries 299 244 69
Provision (benefit) 791 403 978
Balance at end of period 3,211 2,929 2,829
Loans individually evaluated for impairment 40 3 1
Loans collectively evaluated for impairment 3,171 2,926 2,828
Loans:      
Loans individually evaluated for impairment 1,674 309 31
Loans collectively evaluated for impairment 381,544 318,946 283,903
Total loans 383,218 319,255 283,934
Consumer real estate | Non-acquired loans | Other Consumer      
Loans:      
Total loans 13,404 46,573  
Consumer real estate | Non-acquired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Balance at beginning of period 7,212 6,866 6,069
Charge-offs (226) (374) (382)
Recoveries 134 143 271
Provision (benefit) 700 577 908
Balance at end of period 7,820 7,212 6,866
Loans individually evaluated for impairment 80 138 144
Loans collectively evaluated for impairment 7,740 7,074 6,722
Loans:      
Loans individually evaluated for impairment 5,673 7,549 2,966
Loans collectively evaluated for impairment 1,191,948 1,011,435 783,812
Total loans 1,197,621 1,018,984 786,778
Consumer real estate | Acquired non-credit impaired loans | Home equity loans      
Allowance for loan losses:      
Charge-offs (428) (1,662) (530)
Recoveries 199 237 262
Provision (benefit) 229 1,425 268
Loans:      
Loans collectively evaluated for impairment 160,879 190,968 234,949
Total loans 160,879 190,968 234,949
Consumer real estate | Acquired non-credit impaired loans | Consumer Owner Occupied Loans      
Allowance for loan losses:      
Charge-offs   (360) (150)
Recoveries 12 102 20
Provision (benefit) (12) 258 130
Loans:      
Loans collectively evaluated for impairment 408,270 518,107 646,375
Total loans 408,270 518,107 646,375
Commercial and industrial | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 3,974 3,561 3,592
Charge-offs (876) (357) (1,114)
Recoveries 292 844 264
Provision (benefit) 1,452 (74) 819
Balance at end of period 4,842 3,974 3,561
Loans individually evaluated for impairment 386 279 41
Loans collectively evaluated for impairment 4,456 3,695 3,520
Loans:      
Loans individually evaluated for impairment 1,263 1,487 908
Loans collectively evaluated for impairment 670,135 502,321 405,015
Total loans 671,398 503,808 405,923
Commercial and industrial | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (66) (118) (456)
Recoveries 9 19 312
Provision (benefit) 57 99 144
Loans:      
Loans collectively evaluated for impairment 13,641 25,475 41,130
Total loans 13,641 25,475 41,130
Other income producing property | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 1,963 2,232 2,509
Charge-offs (7) (102) (309)
Recoveries 87 85 191
Provision (benefit) (501) (252) (159)
Balance at end of period 1,542 1,963 2,232
Loans individually evaluated for impairment 242 422 646
Loans collectively evaluated for impairment 1,300 1,541 1,586
Loans:      
Loans individually evaluated for impairment 2,372 4,891 5,498
Loans collectively evaluated for impairment 175,866 170,957 145,430
Total loans 178,238 175,848 150,928
Other income producing property | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs   (4) (14)
Recoveries 43 4  
Provision (benefit) (43)   14
Loans:      
Loans collectively evaluated for impairment 39,342 51,169 65,139
Total loans 39,342 51,169 65,139
Consumer | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 1,694 1,367 937
Charge-offs (3,597) (3,574) (3,501)
Recoveries 943 1,011 873
Provision (benefit) 3,310 2,890 3,058
Balance at end of period 2,350 1,694 1,367
Loans individually evaluated for impairment 4 3 2
Loans collectively evaluated for impairment 2,346 1,691 1,365
Loans:      
Loans individually evaluated for impairment 145 102 60
Loans collectively evaluated for impairment 324,093 233,002 189,257
Total loans 324,238 233,104 189,317
Consumer | Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs (532) (643) (231)
Recoveries 51 21 9
Provision (benefit) 481 622 222
Loans:      
Loans collectively evaluated for impairment 142,654 170,647 204,766
Total loans 142,654 170,647 204,766
Commercial | Non-acquired loans      
Loans:      
Total loans 3,322,560 2,602,810  
Other loans | Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period 293 449 209
Provision (benefit) (191) (156) 240
Balance at end of period 102 293 449
Loans individually evaluated for impairment   12  
Loans collectively evaluated for impairment 102 281 449
Loans:      
Loans individually evaluated for impairment   423  
Loans collectively evaluated for impairment 13,404 46,150 45,222
Total loans $ 13,404 $ 46,573 $ 45,222