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Balance Sheet Offsetting (Tables) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Financial Instruments Eligible for Offset Consolidated Balance Sheet | Information about financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2014 is presented in the following tables.
| Gross Amount Recognized |  | Gross Amount Offset |  | Net Amount Recognized
December 31, 2014 |  |  |  |  |
Financial assets: |  |  |  |  |
Derivatives: |  |  |  |  |
Loan/lease interest rate swaps and caps | $ | 2,191 |  |  | $ | — |  |  | $ | 2,191 |
Commodity swaps and options | 27,064 |  |  | — |  |  | 27,064 |
Foreign currency forward contracts | 666 |  |  | — |  |  | 666 |
Total derivatives | 29,921 |  |  | — |  |  | 29,921 |
Resell agreements | 9,642 |  |  | — |  |  | 9,642 |
Total | $ | 39,563 |  |  | $ | — |  |  | $ | 39,563 |
Financial liabilities: |  |  |  |  |
Derivatives: |  |  |  |  |
Loan/lease interest rate swaps | $ | 42,131 |  |  | $ | — |  |  | $ | 42,131 |
Commodity swaps and options | 5,765 |  |  | — |  |  | 5,765 |
Foreign currency forward contracts | 2 |  |  | — |  |  | 2 |
Total derivatives | 47,898 |  |  | — |  |  | 47,898 |
Repurchase agreements | 791,119 |  |  | — |  |  | 791,119 |
Total | $ | 839,017 |  |  | $ | — |  |  | $ | 839,017 |
| Information about financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2013 is presented in the following tables.
| Gross Amount Recognized |  | Gross Amount Offset |  | Net Amount Recognized
December 31, 2013 |  |  |  |  |
Financial assets: |  |  |  |  |
Derivatives: |  |  |  |  |
Loan/lease interest rate swaps and caps | $ | 12,268 |  |  | $ | — |  |  | $ | 12,268 |
Commodity swaps and options | 3,907 |  |  | — |  |  | 3,907 |
Foreign currency forward contracts | 90 |  |  | — |  |  | 90 |
Total derivatives | 16,265 |  |  | — |  |  | 16,265 |
Resell agreements | 7,898 |  |  | — |  |  | 7,898 |
Total | $ | 24,163 |  |  | $ | — |  |  | $ | 24,163 |
Financial liabilities: |  |  |  |  |
Derivatives: |  |  |  |  |
Loan/lease interest rate swaps | $ | 36,660 |  |  | $ | — |  |  | $ | 36,660 |
Commodity swaps and options | 5,916 |  |  | — |  |  | 5,916 |
Foreign currency forward contracts | 27 |  |  | — |  |  | 27 |
Total derivatives | 42,603 |  |  | — |  |  | 42,603 |
Repurchase agreements | 668,053 |  |  | — |  |  | 668,053 |
Total | $ | 710,656 |  |  | $ | — |  |  | $ | 710,656 |
Financial Instruments Derivative Assets Liabilities And Resell Agreements Net Of Amount Not Offset |
|  |  | Gross Amounts Not Offset |  |
| Net Amount Recognized |  | Financial Instruments |  | Collateral |  | Net Amount
December 31, 2014 |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Counterparty A | $ | 627 |  |  | $ | (627 | ) |  | $ | — |  |  | $ | — |
Counterparty B | 17,308 |  |  | (9,506 | ) |  | (4,925 | ) |  | 2,877 |
Counterparty C | 7,991 |  |  | (7,539 | ) |  | — |  |  | 452 |
Other counterparties | 3,995 |  |  | (2,764 | ) |  | (1,110 | ) |  | 121 |
Total derivatives | 29,921 |  |  | (20,436 | ) |  | (6,035 | ) |  | 3,450 |
Resell agreements | 9,642 |  |  | — |  |  | (9,642 | ) |  | — |
Total | $ | 39,563 |  |  | $ | (20,436 | ) |  | $ | (15,677 | ) |  | $ | 3,450 |
Financial liabilities: |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Counterparty A | $ | 18,653 |  |  | $ | (627 | ) |  | $ | (17,626 | ) |  | $ | 400 |
Counterparty B | 9,506 |  |  | (9,506 | ) |  | — |  |  | — |
Counterparty C | 7,539 |  |  | (7,539 | ) |  | — |  |  | — |
Other counterparties | 12,200 |  |  | (2,764 | ) |  | (8,681 | ) |  | 755 |
Total derivatives | 47,898 |  |  | (20,436 | ) |  | (26,307 | ) |  | 1,155 |
Repurchase agreements | 791,119 |  |  | — |  |  | (791,119 | ) |  | — |
Total | $ | 839,017 |  |  | $ | (20,436 | ) |  | $ | (817,426 | ) |  | $ | 1,155 |
|  |  | Gross Amounts Not Offset |  |
| Net Amount Recognized |  | Financial Instruments |  | Collateral |  | Net Amount
December 31, 2013 |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Counterparty A | $ | 3,342 |  |  | $ | (3,342 | ) |  | $ | — |  |  | $ | — |
Counterparty B | 8,196 |  |  | (8,196 | ) |  | — |  |  | — |
Counterparty C | 1,187 |  |  | (1,187 | ) |  | — |  |  | — |
Other counterparties | 3,540 |  |  | (2,099 | ) |  | (1,360 | ) |  | 81 |
Total derivatives | 16,265 |  |  | (14,824 | ) |  | (1,360 | ) |  | 81 |
Resell agreements | 7,898 |  |  | — |  |  | (7,898 | ) |  | — |
Total | $ | 24,163 |  |  | $ | (14,824 | ) |  | $ | (9,258 | ) |  | $ | 81 |
Financial liabilities: |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Counterparty A | $ | 18,615 |  |  | $ | (3,342 | ) |  | $ | (15,167 | ) |  | $ | 106 |
Counterparty B | 9,054 |  |  | (8,196 | ) |  | (613 | ) |  | 245 |
Counterparty C | 10,870 |  |  | (1,187 | ) |  | (9,683 | ) |  | — |
Other counterparties | 4,064 |  |  | (2,099 | ) |  | (1,549 | ) |  | 416 |
Total derivatives | 42,603 |  |  | (14,824 | ) |  | (27,012 | ) |  | 767 |
Repurchase agreements | 668,053 |  |  | — |  |  | (668,053 | ) |  | — |
Total | $ | 710,656 |  |  | $ | (14,824 | ) |  | $ | (695,065 | ) |  | $ | 767 |

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