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Loans and Allowance for Loan Losses - Disaggregated analysis of activity in the allowance for acquired credit impaired loans (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017
Allowance for loan losses: |  |  |  |
Provision (benefit) for loan losses | $ 12,777 | $ 13,783 | $ 11,890 |
Reduction due to loan removals | (723) | (1,134) | (821) |
Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Provision (benefit) for loan losses | 9,283 | 10,763 | 8,684 |
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 |
Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 4,604 | 4,627 | 3,395 |
Provision (benefit) for loan losses | 1,183 | 1,111 | 2,053 |
Reduction due to loan removals | (723) | (1,134) | (821) |
Balance at the end of the period | 5,064 | 4,604 | 4,627 |
Loans collectively evaluated for impairment | 5,064 | 4,604 | 4,627 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 361,846 | 489,723 | 623,430 |
Carrying value | 361,846 | 489,723 | 623,430 | $ 78,967
Acquired non-credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Provision (benefit) for loan losses | 2,311 | 1,909 | 1,153 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 1,760,427 | 2,594,826 | 3,507,907 |
Carrying value | 1,760,427 | 2,594,826 |  |
Residential real estate |  |  |  |
Loans: |  |  |  |
Carrying value | 163,359 | 207,482 |  |
Residential real estate | Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 2,246 | 3,553 | 2,419 |
Provision (benefit) for loan losses | 716 | (892) | 1,662 |
Reduction due to loan removals | (407) | (415) | (528) |
Balance at the end of the period | 2,555 | 2,246 | 3,553 |
Loans collectively evaluated for impairment | 2,555 | 2,246 | 3,553 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 163,359 | 207,482 | 260,787 |
Carrying value | 163,359 | 207,482 | 260,787 |
Commercial non-owner occupied real estate | Construction and land development | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Commercial non-owner occupied real estate | Construction and land development | Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 717 | 180 | 139 |
Provision (benefit) for loan losses | (148) | 657 | 163 |
Reduction due to loan removals |  | (120) | (122) |
Balance at the end of the period | 569 | 717 | 180 |
Loans collectively evaluated for impairment | 569 | 717 | 180 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 25,032 | 32,942 | 49,649 |
Carrying value | 25,032 | 32,942 | 49,649 |
Commercial non-owner occupied real estate | Construction and land development | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Carrying value | 33,569 | 165,070 |  |
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 801 | 288 | 41 |
Provision (benefit) for loan losses | 577 | 532 | 247 |
Reduction due to loan removals | (1) | (19) |  |
Balance at the end of the period | 1,377 | 801 | 288 |
Loans collectively evaluated for impairment | 1,377 | 801 | 288 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 130,938 | 196,764 | 234,595 |
Carrying value | 130,938 | 196,764 | 234,595 |
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 447,441 | 679,253 | 817,166 |
Carrying value | 447,441 | 679,253 |  |
Consumer loans | Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 761 | 461 | 558 |
Provision (benefit) for loan losses | (222) | 303 | (83) |
Reduction due to loan removals |  | (3) | (14) |
Balance at the end of the period | 539 | 761 | 461 |
Loans collectively evaluated for impairment | 539 | 761 | 461 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 35,488 | 42,492 | 51,453 |
Carrying value | 35,488 | 42,492 | 51,453 |
Consumer loans | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Carrying value | 774,647 | 983,015 |  |
Consumer loans | Home equity loans | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Consumer loans | Home equity loans | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 188,732 | 242,425 | 320,591 |
Carrying value | 188,732 | 242,425 |  |
Commercial and industrial |  |  |  |
Loans: |  |  |  |
Carrying value | 7,029 | 10,043 |  |
Commercial and industrial | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Commercial and industrial | Acquired credit impaired loans |  |  |  |
Allowance for loan losses: |  |  |  |
Balance at the beginning of the period | 79 | 145 | 238 |
Provision (benefit) for loan losses | 260 | 511 | 64 |
Reduction due to loan removals | (315) | (577) | (157) |
Balance at the end of the period | 24 | 79 | 145 |
Loans collectively evaluated for impairment | 24 | 79 | 145 |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 7,029 | 10,043 | 26,946 |
Carrying value | 7,029 | 10,043 | 26,946 |
Commercial and industrial | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 101,880 | 212,537 | 398,696 |
Carrying value | 101,880 | 212,537 |  |
Other income producing property | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Other income producing property | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 95,697 | 133,110 | 196,669 |
Carrying value | 95,697 | 133,110 |  |
Consumer |  |  |  |
Loans: |  |  |  |
Carrying value | 35,488 | 42,492 |  |
Consumer | Non-acquired loans |  |  |  |
Allowance for loan losses: |  |  |  |
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 |
Consumer | Acquired credit impaired loans |  |  |  |
Loans: |  |  |  |
Carrying value | 35,488 | 42,492 |  |
Consumer | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 89,484 | 111,777 | 137,710 |
Carrying value | 89,484 | 111,777 |  |
Commercial loans | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Carrying value | 985,780 | 1,611,811 |  |
Commercial loans | Construction and land development | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | 33,569 | 165,070 | 403,357 |
Commercial loans | Other commercial non-owner occupied real estate | Acquired non-credit impaired loans |  |  |  |
Loans: |  |  |  |
Loans collectively evaluated for impairment | $ 307,193 | $ 421,841 | $ 521,818 |

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- Definition The sum of the periodic provision charged to earnings before adjustment for amounts covered under loss sharing agreement. + References No definition available. + Details
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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 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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