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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Activity for Goodwill and Other Intangible Assets | The following table presents activity for goodwill and other intangible assets (in thousands):
| Goodwill |  | Core deposit and other intangible assets |  | Total
Balance at December 31, 2018 | $ | 1,807,121 |  |  | $ | 46,161 |  |  | $ | 1,853,282 |
Acquisitions | 12,690 |  |  | 14,877 |  |  | 27,567 |
Amortization | — |  |  | (9,908) |  |  | (9,908) |
Balance at December 31, 2019 | $ | 1,819,811 |  |  | $ | 51,130 |  |  | $ | 1,870,941 |
Gross Carrying Amount and Accumulated Amortization for the Core Deposit and Other Intangible Assets | The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets, which are subject to amortization (in thousands):
| December 31, 2019 |  | December 31, 2018
Gross carrying amount | $ | 107,665 |  |  | $ | 92,787 |
Accumulated amortization | (56,535) |  |  | (46,626) |
Net book value | $ | 51,130 |  |  | $ | 46,161 |
Supplemental Cash Flow Information | Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents. The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2019 as follows (in thousands):
| For the years ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Cash Payments: |  |  |  |  |
Interest | $ | 287,272 |  |  | $ | 199,464 |  |  | $ | 91,628 |
Income taxes paid | 86,960 |  |  | 55,626 |  |  | 81,539 |
Noncash Transactions: |  |  |  |  |
Loans charged-off to the allowance for loan losses | 28,467 |  |  | 30,400 |  |  | 22,046 |
Loans foreclosed upon with repossessions transferred to other real estate | 17,937 |  |  | 3,524 |  |  | 6,228 |
Loans foreclosed upon with repossessions transferred to other repossessed assets | 93 |  |  | 1,899 |  |  | 646 |
Other real estate sales financed | 871 |  |  | 891 |  |  | 908 |
Fixed assets transferred to other real estate | 8,182 |  |  | — |  |  | — |
Available-for-sale securities transferred to held-to-maturity portfolio | — |  |  | 179,763 |  |  | — |
Held-for-sale loans transferred to held-for-investment loan portfolio | — |  |  | 44,980 |  |  | — |
Common stock issued in connection with acquisitions | — |  |  | — |  |  | 1,850,968 |
Right-of-use assets recognized in the period in exchange for lease obligations(1) | 90,927 |  |  | — |  |  | — |
(1) Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.
Basic and Diluted Earnings Per Share Calculations | The following is a summary of the basic and diluted earnings per share calculation for each of the years in the three-year period ended December 31, 2019 (dollars in thousands except earnings per share):
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Basic earnings per share calculation: |  |  |  |  |
Numerator - Net income | $ | 400,881 |  |  | $ | 359,440 |  |  | $ | 173,979 |
Denominator – Weighted average common shares outstanding | 76,364,303 |  |  | 77,111,372 |  |  | 63,760,578 |
Basic net income per common share | $ | 5.25 |  |  | $ | 4.66 |  |  | $ | 2.73 |
Diluted earnings per share calculation: |  |  |  |  |
Numerator - Net income | $ | 400,881 |  |  | $ | 359,440 |  |  | $ | 173,979 |
Denominator – Weighted average common shares outstanding | 76,364,303 |  |  | 77,111,372 |  |  | 63,760,578 |
Dilutive shares contingently issuable | 399,600 |  |  | 338,545 |  |  | 567,611 |
Weighted average diluted common shares outstanding | 76,763,903 |  |  | 77,449,917 |  |  | 64,328,189 |
Diluted net income per common share | $ | 5.22 |  |  | $ | 4.64 |  |  | $ | 2.70 |

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