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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for loan losses: |  |  |
Charge-offs | $ (9,775) | $ (8,226) | $ (6,779)
Recoveries | 3,914 | 3,300 | 3,430
Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 51,194 | 43,448 | 36,960
Charge-offs | (6,917) | (6,012) | (5,149)
Recoveries | 3,367 | 2,995 | 2,953
Provision (benefit) | 9,283 | 10,763 | 8,684
Balance at end of period | 56,927 | 51,194 | 43,448
Loans individually evaluated for impairment | 1,346 | 1,628 | 1,624
Loans collectively evaluated for impairment | 55,581 | 49,566 | 41,824
Loans: |  |  |
Loans individually evaluated for impairment | 58,532 | 57,018 | 63,423
Loans collectively evaluated for impairment | 9,194,299 | 7,876,268 | 6,428,732
Total loans | 9,252,831 | 7,933,286 | 6,492,155
Acquired non-credit impaired loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (2,858) | (2,214) | (1,630)
Recoveries | 547 | 305 | 477
Provision (benefit) | 2,311 | 1,909 | 1,153
Loans: |  |  |
Loans collectively evaluated for impairment | 1,760,427 | 2,594,826 | 3,507,907
Total loans | 1,760,427 | 2,594,826 | 3,507,907
Commercial non-owner occupied real estate | Non-acquired loans |  |  |
Loans: |  |  |
Total loans | 2,779,498 | 2,256,996 |
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 5,682 | 5,921 | 4,091
Charge-offs | (78) | (76) | (546)
Recoveries | 1,016 | 1,340 | 968
Provision (benefit) | (516) | (1,503) | 1,408
Balance at end of period | 6,104 | 5,682 | 5,921
Loans individually evaluated for impairment | 617 | 788 | 1,063
Loans collectively evaluated for impairment | 5,487 | 4,894 | 4,858
Loans: |  |  |
Loans individually evaluated for impairment | 35,201 | 37,913 | 43,230
Loans collectively evaluated for impairment | 933,159 | 803,532 | 787,645
Total loans | 968,360 | 841,445 | 830,875
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 | 8,754 | 6,525 | 4,980
Charge-offs | (3) |  |
Recoveries | 76 | 11 | 132
Provision (benefit) | 1,872 | 2,218 | 1,413
Balance at end of period | 10,699 | 8,754 | 6,525
Loans individually evaluated for impairment |  | 70 | 125
Loans collectively evaluated for impairment | 10,699 | 8,684 | 6,400
Loans: |  |  |
Loans individually evaluated for impairment | 379 | 1,025 | 1,375
Loans collectively evaluated for impairment | 1,810,759 | 1,414,526 | 1,007,518
Total loans | 1,811,138 | 1,415,551 | 1,008,893
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate |  |  |
Loans: |  |  |
Loans collectively evaluated for impairment | 447,441 | 679,253 | 817,166
Total loans | 447,441 | 679,253 | 817,166
Commercial owner occupied real estate loan | Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 9,369 | 8,128 | 8,022
Charge-offs | (87) | (659) |
Recoveries | 174 | 145 | 220
Provision (benefit) | 1,125 | 1,755 | (114)
Balance at end of period | 10,581 | 9,369 | 8,128
Loans individually evaluated for impairment | 24 | 27 | 64
Loans collectively evaluated for impairment | 10,557 | 9,342 | 8,064
Loans: |  |  |
Loans individually evaluated for impairment | 6,575 | 4,142 | 5,642
Loans collectively evaluated for impairment | 1,777,442 | 1,513,409 | 1,257,134
Total loans | 1,784,017 | 1,517,551 | 1,262,776
Consumer loans | Non-acquired loans |  |  |
Loans: |  |  |
Total loans | 2,637,467 | 2,431,413 |
Consumer loans | Non-acquired loans | Home equity loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 3,434 | 3,250 | 3,211
Charge-offs | (203) | (215) | (330)
Recoveries | 265 | 279 | 210
Provision (benefit) | (308) | 120 | 159
Balance at end of period | 3,188 | 3,434 | 3,250
Loans individually evaluated for impairment | 132 | 142 | 135
Loans collectively evaluated for impairment | 3,056 | 3,292 | 3,115
Loans: |  |  |
Loans individually evaluated for impairment | 2,461 | 2,826 | 3,011
Loans collectively evaluated for impairment | 516,167 | 492,322 | 434,631
Total loans | 518,628 | 495,148 | 437,642
Consumer loans | Non-acquired loans | Other Consumer |  |  |
Loans: |  |  |
Total loans | 13,892 | 9,357 |
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 11,913 | 9,668 | 7,820
Charge-offs | (50) | (80) | (185)
Recoveries | 213 | 132 | 306
Provision (benefit) | 520 | 2,193 | 1,727
Balance at end of period | 12,596 | 11,913 | 9,668
Loans individually evaluated for impairment | 102 | 41 | 37
Loans collectively evaluated for impairment | 12,494 | 11,872 | 9,631
Loans: |  |  |
Loans individually evaluated for impairment | 5,141 | 6,761 | 5,632
Loans collectively evaluated for impairment | 2,113,698 | 1,929,504 | 1,524,628
Total loans | 2,118,839 | 1,936,265 | 1,530,260
Consumer loans | Acquired non-credit impaired loans | Home equity loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (263) | (436) | (859)
Recoveries | 206 | 102 | 393
Provision (benefit) | 57 | 334 | 466
Loans: |  |  |
Loans collectively evaluated for impairment | 188,732 | 242,425 | 320,591
Total loans | 188,732 | 242,425 | 320,591
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (6) | (70) | (150)
Recoveries | 26 | 64 | 41
Provision (benefit) | (20) | 6 | 109
Loans: |  |  |
Loans collectively evaluated for impairment | 496,431 | 628,813 | 710,611
Total loans | 496,431 | 628,813 | 710,611
Commercial and industrial | Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 7,454 | 5,488 | 4,842
Charge-offs | (622) | (500) | (776)
Recoveries | 351 | 256 | 343
Provision (benefit) | 1,156 | 2,210 | 1,079
Balance at end of period | 8,339 | 7,454 | 5,488
Loans individually evaluated for impairment | 366 | 416 | 15
Loans collectively evaluated for impairment | 7,973 | 7,038 | 5,473
Loans: |  |  |
Loans individually evaluated for impairment | 6,578 | 1,291 | 1,156
Loans collectively evaluated for impairment | 1,274,281 | 1,053,661 | 814,031
Total loans | 1,280,859 | 1,054,952 | 815,187
Commercial and industrial | Acquired non-credit impaired loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (1,289) | (1,108) | (71)
Recoveries | 190 | 63 | 6
Provision (benefit) | 1,099 | 1,045 | 65
Loans: |  |  |
Loans collectively evaluated for impairment | 101,880 | 212,537 | 398,696
Total loans | 101,880 | 212,537 | 398,696
Other income producing property | Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 1,446 | 1,375 | 1,542
Charge-offs | (31) | (2) | (51)
Recoveries | 94 | 21 | 85
Provision (benefit) | (173) | 52 | (201)
Balance at end of period | 1,336 | 1,446 | 1,375
Loans individually evaluated for impairment | 50 | 142 | 178
Loans collectively evaluated for impairment | 1,286 | 1,304 | 1,197
Loans: |  |  |
Loans individually evaluated for impairment | 2,024 | 2,872 | 3,138
Loans collectively evaluated for impairment | 216,593 | 211,481 | 190,709
Total loans | 218,617 | 214,353 | 193,847
Other income producing property | Acquired non-credit impaired loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (26) |  |
Recoveries | 71 |  | 8
Provision (benefit) | (45) |  | (8)
Loans: |  |  |
Loans collectively evaluated for impairment | 95,697 | 133,110 | 196,669
Total loans | 95,697 | 133,110 | 196,669
Consumer | Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 3,101 | 2,788 | 2,350
Charge-offs | (5,843) | (4,480) | (3,261)
Recoveries | 1,178 | 811 | 689
Provision (benefit) | 5,511 | 3,982 | 3,010
Balance at end of period | 3,947 | 3,101 | 2,788
Loans individually evaluated for impairment | 55 | 2 | 7
Loans collectively evaluated for impairment | 3,892 | 3,099 | 2,781
Loans: |  |  |
Loans individually evaluated for impairment | 173 | 188 | 239
Loans collectively evaluated for impairment | 538,308 | 448,476 | 378,746
Total loans | 538,481 | 448,664 | 378,985
Consumer | Acquired non-credit impaired loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (444) | (465) | (468)
Recoveries | 51 | 68 | 23
Provision (benefit) | 393 | 397 | 445
Loans: |  |  |
Loans collectively evaluated for impairment | 89,484 | 111,777 | 137,710
Total loans | 89,484 | 111,777 | 137,710
Commercial loans | Non-acquired loans |  |  |
Loans: |  |  |
Total loans | 6,062,991 | 5,043,852 |
Commercial loans | Acquired non-credit impaired loans | Construction and land development |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (44) | (107) | (82)
Recoveries | 3 | 8 | 4
Provision (benefit) | 41 | 99 | 78
Loans: |  |  |
Loans collectively evaluated for impairment | 33,569 | 165,070 | 403,357
Total loans | 33,569 | 165,070 | 403,357
Commercial loans | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (786) | (28) |
Recoveries |  |  | 2
Provision (benefit) | 786 | 28 | (2)
Loans: |  |  |
Loans collectively evaluated for impairment | 307,193 | 421,841 | 521,818
Total loans | 307,193 | 421,841 | 521,818
Other loans |  |  |
Loans: |  |  |
Loans collectively evaluated for impairment |  |  | 1,289
Total loans |  |  | 1,289
Other loans | Non-acquired loans |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of period | 41 | 305 | 102
Provision (benefit) | 96 | (264) | 203
Balance at end of period | 137 | 41 | 305
Loans collectively evaluated for impairment | 137 | 41 | 305
Loans: |  |  |
Loans collectively evaluated for impairment | 13,892 | 9,357 | 33,690
Total loans | $ 13,892 | $ 9,357 | $ 33,690

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