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Basis of presentation (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit loss | $ 77,084 |  | $ 53,355 | $ 54,297 | $ 52,119
Allowance for loan commitments | 3,800 |  | 1,741 |  |
Retained earnings | 604,071 | $ 622,042 | 622,042 |  |
Total shareholders’ equity | 2,276,505 | 2,280,260 | 2,280,260 | $ 2,183,515 | $ 2,162,280
Loans held for investment, net | 5,103,848 | 5,067,821 | 5,067,821 |  |
Total assets | 13,849,018 | 13,745,251 | 13,745,251 |  |
Deferred income taxes | 382,872 | 379,324 | 379,324 |  |
Other | 521,978 | 583,545 | 583,545 |  |
Total liabilities | 11,538,220 | 11,430,698 | 11,430,698 |  |
Total liabilities and shareholders' equity | $ 13,849,018 | 13,745,251 | 13,745,251 |  |
As reported under ASU No. 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | 606,670 |  |  |
Total shareholders’ equity |  | 2,264,888 |  |  |
Loans held for investment, net |  | 5,048,380 |  |  |
Total assets |  | 13,725,810 |  |  |
Deferred income taxes |  | 373,696 |  |  |
Other |  | 585,104 |  |  |
Total liabilities |  | 11,426,629 |  |  |
Total liabilities and shareholders' equity |  | 13,725,810 |  |  |
Impact of ASU No. 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit loss |  | 21,000 | 19,441 |  |
Allowance for loan commitments |  | 2,000 | $ 1,559 |  |
Retained earnings |  | (15,372) |  |  |
Total shareholders’ equity |  | (15,372) |  |  |
Loans held for investment, net |  | (19,441) |  |  |
Total assets |  | (19,441) |  |  |
Deferred income taxes |  | (5,628) |  |  |
Other |  | 1,559 |  |  |
Total liabilities |  | (4,069) |  |  |
Total liabilities and shareholders' equity |  | $ (19,441) |  |  |

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