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Commitments and Contingencies | 3 Months Ended
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Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies | Commitments and Contingencies Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we enter into various transactions, which, in accordance with generally accepted accounting principles are not included in our consolidated balance sheets. We enter into these transactions to meet the financing needs of our customers. As more fully discussed in our 2016 Form 10-K, these transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. We minimize our exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. Financial instruments with off-balance-sheet risk were as follows:
| March 31, 2017 |  | December 31, 2016
Commitments to extend credit | $ | 7,834,523 |  |  | $ | 7,476,420 |
Standby letters of credit | 240,791 |  |  | 239,482 |
Deferred standby letter of credit fees | 1,931 |  |  | 2,054 |
Lease Commitments. We lease certain office facilities and office equipment under operating leases. Rent expense for all operating leases totaled $7.7 million and $7.2 million during the three months ended March 31, 2017 and 2016. There has been no significant change in our expected future minimum lease payments since December 31, 2016. See the 2016 Form 10-K for information regarding these commitments. Litigation. We are subject to various claims and legal actions that have arisen in the course of conducting business. Management does not expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.

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