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Loans and Allowance for Loan Losses - Aggregated analysis of the changes in allowance for loan losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in allowance for loan losses      
Balance at beginning of period $ 55,798 $ 48,075 $ 40,355
Loans charged-off (9,775) (8,226) (6,779)
Recoveries of loans previously charged off 3,914 3,300 3,430
Net charge-offs (5,861) (4,926) (3,349)
Reduction due to loan removals (723) (1,134) (821)
Balance at end of period 61,991 55,798 48,075
Non-acquired loans      
Changes in allowance for loan losses      
Balance at beginning of period 51,194 43,448 36,960
Loans charged-off (6,917) (6,012) (5,149)
Recoveries of loans previously charged off 3,367 2,995 2,953
Net charge-offs (3,550) (3,017) (2,196)
Provision for loan losses charged to operations 9,283 10,763 8,684
Balance at end of period 56,927 51,194 43,448
Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (2,858) (2,214) (1,630)
Recoveries of loans previously charged off 547 305 477
Net charge-offs (2,311) (1,909) (1,153)
Provision for loan losses charged to operations 2,311 1,909 1,153
Acquired credit impaired loans      
Changes in allowance for loan losses      
Balance at beginning of period 4,604 4,627 3,395
Reduction due to loan removals (723) (1,134) (821)
Balance at end of period 5,064 4,604 4,627
Residential real estate | Acquired credit impaired loans      
Changes in allowance for loan losses      
Reduction due to loan removals (407) (415) (528)
Commercial owner occupied real estate loan | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (87) (659)  
Recoveries of loans previously charged off 174 145 220
Provision for loan losses charged to operations 1,125 1,755 (114)
Consumer loans | Acquired credit impaired loans      
Changes in allowance for loan losses      
Reduction due to loan removals   (3) (14)
Commercial and industrial | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (622) (500) (776)
Recoveries of loans previously charged off 351 256 343
Provision for loan losses charged to operations 1,156 2,210 1,079
Commercial and industrial | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (1,289) (1,108) (71)
Recoveries of loans previously charged off 190 63 6
Provision for loan losses charged to operations 1,099 1,045 65
Commercial and industrial | Acquired credit impaired loans      
Changes in allowance for loan losses      
Reduction due to loan removals (315) (577) (157)
Other income producing property | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (31) (2) (51)
Recoveries of loans previously charged off 94 21 85
Provision for loan losses charged to operations (173) 52 (201)
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   8
Provision for loan losses charged to operations (45)   (8)
Consumer | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (5,843) (4,480) (3,261)
Recoveries of loans previously charged off 1,178 811 689
Provision for loan losses charged to operations 5,511 3,982 3,010
Consumer | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (444) (465) (468)
Recoveries of loans previously charged off 51 68 23
Provision for loan losses charged to operations 393 397 445
Other loans | Non-acquired loans      
Changes in allowance for loan losses      
Provision for loan losses charged to operations 96 (264) 203
Construction and land development | Commercial non-owner occupied real estate | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (78) (76) (546)
Recoveries of loans previously charged off 1,016 1,340 968
Provision for loan losses charged to operations (516) (1,503) 1,408
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   (120) (122)
Construction and land development | Commercial loans | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (44) (107) (82)
Recoveries of loans previously charged off 3 8 4
Provision for loan losses charged to operations 41 99 78
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)    
Recoveries of loans previously charged off 76 11 132
Provision for loan losses charged to operations 1,872 2,218 1,413
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 (1) (19)  
Other commercial non-owner occupied real estate | Commercial loans | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (786) (28)  
Recoveries of loans previously charged off     2
Provision for loan losses charged to operations 786 28 (2)
Home equity loans | Consumer loans | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (203) (215) (330)
Recoveries of loans previously charged off 265 279 210
Provision for loan losses charged to operations (308) 120 159
Home equity loans | Consumer loans | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (263) (436) (859)
Recoveries of loans previously charged off 206 102 393
Provision for loan losses charged to operations 57 334 466
Consumer Owner Occupied Loans | Consumer loans | Non-acquired loans      
Changes in allowance for loan losses      
Loans charged-off (50) (80) (185)
Recoveries of loans previously charged off 213 132 306
Provision for loan losses charged to operations 520 2,193 1,727
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans      
Changes in allowance for loan losses      
Loans charged-off (6) (70) (150)
Recoveries of loans previously charged off 26 64 41
Provision for loan losses charged to operations $ (20) $ 6 $ 109