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Loans and Allowance for Loan Losses - Aggregated analysis of the changes in allowance for loan losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in allowance for loan losses        
Balance at beginning of period $ 56,522 $ 49,287 $ 55,798 $ 48,075
Loans charged-off (2,862) (2,423) (4,481) (3,926)
Recoveries of loans previously charged off 991 1,138 1,949 2,105
Net charge-offs (1,871) (1,285) (2,532) (1,821)
Provision for loan losses charged to operations 3,704 4,478 5,192 6,932
Reduction due to loan removals (142) (180) (245) (886)
Balance at end of period 58,213 52,300 58,213 52,300
Non-acquired loans        
Changes in allowance for loan losses        
Balance at beginning of period 52,008 45,203 51,194 43,448
Loans charged-off (1,327) (1,240) (2,572) (2,409)
Recoveries of loans previously charged off 875 1,051 1,627 1,853
Net charge-offs (452) (189) (945) (556)
Provision for loan losses charged to operations 2,034 2,860 3,341 4,982
Balance at end of period 53,590 47,874 53,590 47,874
Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (1,535) (1,183) (1,909) (1,517)
Recoveries of loans previously charged off 116 87 322 252
Net charge-offs (1,419) (1,096) (1,587) (1,265)
Provision for loan losses charged to operations 1,419 1,096 1,587 1,265
Acquired credit impaired loans        
Changes in allowance for loan losses        
Balance at beginning of period 4,514 4,084 4,604 4,627
Provision for loan losses charged to operations 251 522 264 685
Reduction due to loan removals (142) (180) (245) (886)
Balance at end of period 4,623 4,426 4,623 4,426
Residential real estate | Acquired credit impaired loans        
Changes in allowance for loan losses        
Reduction due to loan removals (97) (132) (195) (232)
Commercial owner occupied real estate loan | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off   (81) (12) (81)
Recoveries of loans previously charged off 41 25 66 33
Provision for loan losses charged to operations (144) 317 103 527
Commercial owner occupied real estate loan | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (786) (28) (786) (28)
Provision for loan losses charged to operations 786 28 786 28
Consumer loans | Acquired credit impaired loans        
Changes in allowance for loan losses        
Reduction due to loan removals   (3)   (3)
Commercial and industrial | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (90) (59) (109) (144)
Recoveries of loans previously charged off 138 199 209 214
Provision for loan losses charged to operations 198 238 (59) 1,153
Commercial and industrial | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (506) (764) (640) (807)
Recoveries of loans previously charged off 6 2 171 55
Provision for loan losses charged to operations 500 762 469 752
Commercial and industrial | Acquired credit impaired loans        
Changes in allowance for loan losses        
Reduction due to loan removals (45) (16) (45) (556)
Other income producing property | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (31)   (31)  
Recoveries of loans previously charged off 13 3 58 11
Provision for loan losses charged to operations (10) 17 (114) 27
Other income producing property | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off     (26)  
Recoveries of loans previously charged off 71   71  
Provision for loan losses charged to operations (71)   (45)  
Consumer | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (1,146) (1,095) (2,308) (2,074)
Recoveries of loans previously charged off 206 207 458 410
Provision for loan losses charged to operations 1,317 1,060 2,321 1,947
Consumer | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (69) (127) (205) (265)
Recoveries of loans previously charged off 11 46 27 49
Provision for loan losses charged to operations 58 81 178 216
Other loans | Non-acquired loans        
Changes in allowance for loan losses        
Provision for loan losses charged to operations (106) 206 (41) 58
Construction and land development | Commercial non-owner occupied real estate | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (9)   (9) (35)
Recoveries of loans previously charged off 326 547 625 989
Provision for loan losses charged to operations 30 (207) (580) (688)
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off   (106) (6) (107)
Recoveries of loans previously charged off 1 6 2 7
Provision for loan losses charged to operations (1) 100 4 100
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans        
Changes in allowance for loan losses        
Reduction due to loan removals   (29)   (82)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (3)   (3)  
Recoveries of loans previously charged off 23 2 45 4
Provision for loan losses charged to operations 551 409 1,515 680
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans        
Changes in allowance for loan losses        
Reduction due to loan removals     (5) (13)
Home equity loans | Consumer loans | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off   (5) (15) (71)
Recoveries of loans previously charged off 98 27 134 128
Provision for loan losses charged to operations (194) 109 (376) 61
Home equity loans | Consumer loans | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (168) (158)    
Recoveries of loans previously charged off 24 28    
Provision for loan losses charged to operations 144 130    
Home equity loans | Commercial loans | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off     (240) (240)
Recoveries of loans previously charged off     46 79
Provision for loan losses charged to operations     194 161
Consumer Owner Occupied Loans | Consumer loans | Non-acquired loans        
Changes in allowance for loan losses        
Loans charged-off (48)   (85) (4)
Recoveries of loans previously charged off 30 41 32 64
Provision for loan losses charged to operations 392 711 572 1,217
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans        
Changes in allowance for loan losses        
Loans charged-off (6)   (6) (70)
Recoveries of loans previously charged off 3 5 5 62
Provision for loan losses charged to operations $ 3 $ (5) $ 1 $ 8