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Loans and Allowance for Loan Losses - Summary of acquired non credit impaired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | $ 361,846 | $ 489,723 | $ 623,430 | $ 78,967 |
Less allowance for loan losses | (5,064) | (4,604) | (4,627) |  | $ (3,395)
Acquired loans, net | 356,782 | 485,119 | 618,803 |  |
Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 1,760,427 | 2,594,826 |  |  |
Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 361,846 | 489,723 |  |  |
Less allowance for loan losses | (5,064) | (4,604) |  |  |
Acquired loans, net | 356,782 | 485,119 |  |  |
Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 1,760,427 | 2,594,826 |  |  |
Residential real estate |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 163,359 | 207,482 |  |  |
Residential real estate | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 163,359 | 207,482 | 260,787 |  |
Less allowance for loan losses | (2,555) | (2,246) | (3,553) |  | (2,419)
Residential real estate | Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 163,359 | 207,482 |  |  |
Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 481,010 | 844,323 |  |  |
Commercial owner occupied real estate loan | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 307,193 | 421,841 |  |  |
Commercial owner occupied real estate loan | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 307,193 | 421,841 |  |  |
Consumer loans | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 35,488 | 42,492 | 51,453 |  |
Less allowance for loan losses | (539) | (761) | (461) |  | (558)
Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 685,163 | 871,238 |  |  |
Consumer loans | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 774,647 | 983,015 |  |  |
Commercial and industrial |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 7,029 | 10,043 |  |  |
Commercial and industrial | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 7,029 | 10,043 | 26,946 |  |
Less allowance for loan losses | (24) | (79) | (145) |  | (238)
Commercial and industrial | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 101,880 | 212,537 |  |  |
Commercial and industrial | Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 7,029 | 10,043 |  |  |
Commercial and industrial | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 101,880 | 212,537 |  |  |
Other income producing property | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 95,697 | 133,110 |  |  |
Other income producing property | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 95,697 | 133,110 |  |  |
Consumer |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 35,488 | 42,492 |  |  |
Consumer | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 35,488 | 42,492 |  |  |
Consumer | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 89,484 | 111,777 |  |  |
Consumer | Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 35,488 | 42,492 |  |  |
Consumer | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 89,484 | 111,777 |  |  |
Commercial loans | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 985,780 | 1,611,811 |  |  |
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 25,032 | 32,942 | 49,649 |  |
Less allowance for loan losses | (569) | (717) | (180) |  | (139)
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 33,569 | 165,070 |  |  |
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 25,032 | 32,942 |  |  |
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 33,569 | 165,070 |  |  |
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 130,938 | 196,764 | 234,595 |  |
Less allowance for loan losses | (1,377) | (801) | $ (288) |  | $ (41)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 447,441 | 679,253 |  |  |
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans accounted under FASB 310 30 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 130,938 | 196,764 |  |  |
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 447,441 | 679,253 |  |  |
Home equity loans | Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 188,732 | 242,425 |  |  |
Home equity loans | Consumer loans | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 188,732 | 242,425 |  |  |
Other Consumer | Consumer loans | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 89,484 | 111,777 |  |  |
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20 |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | 496,431 | 628,813 |  |  |
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |
Carrying value | $ 496,431 | $ 628,813 |  |  |

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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