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Securities Sold Under Agreements to Repurchase (Tables) | 3 Months Ended
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Mar. 31, 2018
Transfers and Servicing [Abstract] |
Carrying Value of Repurchase Agreements | The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral:
| March 31, 2018
| Remaining Contractual Maturity of the Agreements
(Dollars in thousands) | Overnight and Continuous |  | 30 - 90 Days |  | Greater Than 90 Days |  | Total
State and local governments | $ | 18,928 |  |  | 1,285 |  |  | 20,393 |  |  | 40,606 |
Residential mortgage-backed securities | 353,465 |  |  | — |  |  | — |  |  | 353,465 |
Commercial mortgage-backed securities | 1,723 |  |  | — |  |  | — |  |  | 1,723 |
Total | $ | 374,116 |  |  | 1,285 |  |  | 20,393 |  |  | 395,794 |
| December 31, 2017
| Remaining Contractual Maturity of the Agreements
(Dollars in thousands) | Overnight and Continuous |  | 30 - 90 Days |  | Greater Than 90 Days |  | Total
Residential mortgage-backed securities | $ | 360,751 |  |  | — |  |  | — |  |  | 360,751 |
Commercial mortgage-backed securities | 1,822 |  |  | — |  |  | — |  |  | 1,822 |
Total | $ | 362,573 |  |  | — |  |  | — |  |  | 362,573 |

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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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