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Derivative Instruments and Hedging Activities (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Financial Instruments | The following tables present the fair value of Customers' derivative financial instruments as well as their presentation on the balance sheet as of September 30, 2018 and December 31, 2017.
|  | September 30, 2018
|  | Derivative Assets |  | Derivative Liabilities
|  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |  |
Derivatives designated as cash flow hedges: |  |  |  |  |  |  |  |
Interest rate swaps |  | Other assets |  | $ | 3,859 |  |  | Other liabilities |  | $ | — |
Total |  |  |  | $ | 3,859 |  |  |  |  | $ | — |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |
Interest rate swaps |  | Other assets |  | $ | 18,596 |  |  | Other liabilities |  | $ | 15,653 |
Credit contracts |  | Other assets |  | 36 |  |  | Other liabilities |  | 31 |
Residential mortgage loan commitments |  | Other assets |  | 122 |  |  | Other liabilities |  | — |
Total |  |  |  | $ | 18,754 |  |  |  |  | $ | 15,684 |
|  | December 31, 2017
|  | Derivative Assets |  | Derivative Liabilities
|  | Balance Sheet |  |  |  | Balance Sheet |  |
|  | Location |  | Fair Value |  | Location |  | Fair Value
(amounts in thousands) |  |  |  |  |  |  |  |
Derivatives designated as cash flow hedges: |  |  |  |  |  |  |  |
Interest rate swaps |  | Other assets |  | $ | 816 |  |  | Other liabilities |  | $ | 1,140 |
Total |  |  |  | $ | 816 |  |  |  |  | $ | 1,140 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |
Interest rate swaps |  | Other assets |  | $ | 8,776 |  |  | Other liabilities |  | $ | 8,897 |
Credit contracts |  | Other assets |  | 100 |  |  | Other liabilities |  | 37 |
Residential mortgage loan commitments |  | Other assets |  | 60 |  |  | Other liabilities |  | — |
Total |  |  |  | $ | 8,936 |  |  |  |  | $ | 8,934 |
Effect of Derivative Financial Instruments on Comprehensive Income | The following tables present the effect of Customers' derivative financial instruments on comprehensive income for the three and nine months ended September 30, 2018 and 2017.
| Three Months Ended September 30, 2018
| Income Statement Location |  | Amount of Income (Loss) Recognized in Earnings
(amounts in thousands) |  |  |
Derivatives not designated as hedging instruments: |  |  |
Interest rate swaps | Other non-interest income |  | $ | 1,139 |
Credit contracts | Other non-interest income |  | 156 |
Residential mortgage loan commitments | Mortgage banking income |  | (11 | )
Total |  |  | $ | 1,284 |
| Three Months Ended September 30, 2017
| Income Statement Location |  | Amount of Income (Loss) Recognized in Earnings
(amounts in thousands) |  |  |
Derivatives not designated as hedging instruments: |  |  |
Interest rate swaps | Other non-interest income |  | $ | 91 |
Credit contracts | Other non-interest income |  | (6 | )
Residential mortgage loan commitments | Mortgage banking income |  | 1 |
Total |  |  | $ | 86 |
| Nine Months Ended September 30, 2018
| Income Statement Location |  | Amount of Income Recognized in Earnings
(amounts in thousands) |  |  |
Derivatives not designated as hedging instruments: |  |  |
Interest rate swaps | Other non-interest income |  | $ | 1,472 |
Credit contracts | Other non-interest income |  | 119 |
Residential mortgage loan commitments | Mortgage banking income |  | 62 |
Total |  |  | $ | 1,653 |
| Nine Months Ended September 30, 2017
| Income Statement Location |  | Amount of Income (Loss) Recognized in Earnings
(amounts in thousands) |  |  |
Derivatives not designated as hedging instruments: |  |  |
Interest rate swaps | Other non-interest income |  | $ | 429 |
Credit contracts | Other non-interest income |  | (5 | )
Residential mortgage loan commitments | Mortgage banking income |  | 58 |
Total |  |  | $ | 482 |
| Three Months Ended September 30, 2018
| Amount of Gain (Loss) Recognized in OCI on Derivatives (1) |  | Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  | Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
(amounts in thousands) |  |  |  |  |
Derivatives in cash flow hedging relationships: |  |  |  |  |
Interest rate swaps | $ | 3,006 |  |  | Interest expense |  | $ | (303 | )
|  |  |  | Other non-interest income (2) |  | 2,822 |
Total |  |  |  |  |  | $ | 2,519 |
| Three Months Ended September 30, 2017
| Amount of Gain (Loss) Recognized in OCI on Derivatives (1) |  | Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  | Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
(amounts in thousands) |  |  |  |  |
Derivatives in cash flow hedging relationships: |  |  |  |  |
Interest rate swaps | $ | 104 |  |  | Interest expense |  | $ | (572 | )
| Nine Months Ended September 30, 2018
| Amount of Gain (Loss) Recognized in OCI on Derivatives (1) |  | Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  | Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
(amounts in thousands) |  |  |  |  |
Derivative in cash flow hedging relationships: |  |  |  |  |
Interest rate swaps | $ | 5,055 |  |  | Interest expense |  | $ | (175 | )
|  |  |  | Other non-interest income (2) |  | 2,822 |
Total |  |  |  |  |  | $ | 2,647 |
| Nine Months Ended September 30, 2017
| Amount of Gain (Loss) Recognized in OCI on Derivatives (1) |  | Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  | Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
(amounts in thousands) |  |  |  |  |
Derivative in cash flow hedging relationships: |  |  |  |  |
Interest rate swaps | $ | (115 | ) |  | Interest expense |  | $ | (2,166 | )
(1) Amounts presented are net of taxes. See NOTE 4 - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) for total effect on other comprehensive income (loss) from derivatives designated as cash flow hedges for the periods presented.
Summary of Offsetting of Financial Assets and Derivative Assets | Offsetting of Financial Assets and Derivative Assets At December 31, 2017
| Gross Amount of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | Gross Amounts Not Offset in the Consolidated Balance Sheet |  | Net Amount
| Financial Instruments |  | Cash Collateral Received |
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 5,930 |  |  | $ | — |  |  | $ | 5,930 |  |  | $ | — |  |  | $ | 5,070 |  |  | $ | 860 |
Offsetting of Financial Assets and Derivative Assets At September 30, 2018
| Gross Amount of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | Gross Amounts Not Offset in the Consolidated Balance Sheet |  | Net Amount
| Financial Instruments |  | Cash Collateral Received |
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 20,688 |  |  | $ | — |  |  | $ | 20,688 |  |  | $ | — |  |  | $ | 19,330 |  |  | $ | 1,358 |
Summary of Offsetting of Financial Liabilities and Derivative Liabilities | Offsetting of Financial Liabilities and Derivative Liabilities At December 31, 2017
| Gross Amount of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheet |  | Gross Amounts Not Offset in the Consolidated Balance Sheet |  | Net Amount
| Financial Instruments |  | Cash Collateral Pledged |
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 5,058 |  |  | $ | — |  |  | $ | 5,058 |  |  | $ | — |  |  | $ | 4,872 |  |  | $ | 186 |
Offsetting of Financial Liabilities and Derivative Liabilities At September 30, 2018
| Gross Amount of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheet |  | Gross Amounts Not Offset in the Consolidated Balance Sheet |  |
| Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 1,924 |  |  | $ | — |  |  | $ | 1,924 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1,922 |

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