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Loans - Changes in the carrying amount and the accretable yield for the acquired loans - Parenthetical (Details) - ASC Subtopic 310-30 - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |
Carrying amount | $ 1,789,237 | $ 1,831,257 | $ 1,883,556 | $ 2,033,457 | $ 2,085,191 | $ 2,108,993
Accretable yield | 1,042,407 | $ 1,068,167 | $ 1,092,504 | 1,178,042 | $ 1,204,726 | $ 1,214,488
Non-credit Impaired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |
Carrying amount | 1,500,000 |  |  | 1,300,000 |  |
Accretable yield | $ 900,000 |  |  | $ 700,000 |  |

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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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=82894507&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)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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