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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Financial Instruments | The following table presents the fair value of Customers’ derivative financial instruments as well as their presentation on the consolidated balance sheets at December 31, 2017 and 2016.
|  | 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 |
|  | December 31, 2016
|  | 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 |  | $ | — |  |  | Other liabilities |  | $ | 3,624 |
Total |  |  |  | $ | — |  |  |  |  | $ | 3,624 |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |
Interest rate swaps |  | Other assets |  | $ | 10,683 |  |  | Other liabilities |  | $ | 10,537 |
Credit contracts |  | Other assets |  | 136 |  |  | Other liabilities |  | 11 |
Residential mortgage loan commitments |  | Other assets |  | 45 |  |  | Other liabilities |  | — |
Total |  |  |  | $ | 10,864 |  |  |  |  | $ | 10,548 |
Effect of Derivative Instruments on Comprehensive Income | The following table presents the effect of Customers' derivative financial instruments on comprehensive income for the years ended December 31, 2017, 2016 and 2015.
| For the Year Ended December 31, 2017
| 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 | $ | 604 |
Credit contracts | Other non-interest income | 171 |
Residential mortgage loan commitments | Mortgage banking income | 15 |
Total |  | $ | 790 |
| For the Year Ended December 31, 2016
| 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 | $ | 2,955 |
Credit contracts | Other non-interest income | 163 |
Residential mortgage loan commitments | Mortgage banking income | — |
Total |  | $ | 3,118 |
| For the Year Ended December 31, 2015
| 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 | $ | 1,889 |
Credit contracts | Other non-interest income | (15 | )
Residential mortgage loan commitments | Mortgage banking income | 2 |
Total |  | $ | 1,876 |
|  | For the Year Ended December 31, 2017
|  |  |  | Location of Gain |  | Amount of Loss
|  | Amount of Income |  | (Loss) Reclassified |  | Reclassified from
|  | Recognized in OCI on |  | from Accumulated |  | Accumulated OCI into
|  | Derivatives (Effective |  | OCI into Income |  | Income (Effective
|  | Portion) (1) |  | (Effective Portion) |  | Portion)
(amounts in thousands) |  |  |  |  |  |
Derivatives in cash flow hedging relationships: |  |  |  |  |  |
Interest rate swaps |  | $ | 406 |  |  | Interest expense |  | $ | (2,634 | )
|  | For the Year Ended December 31, 2016
|  |  |  | Location of Gain |  | Amount of Loss
|  | Amount of Loss |  | (Loss) Reclassified |  | Reclassified from
|  | Recognized in OCI on |  | from Accumulated |  | Accumulated OCI into
|  | Derivatives (Effective |  | OCI into Income |  | Income (Effective
|  | Portion) (1) |  | (Effective Portion) |  | Portion)
(amounts in thousands) |  |  |  |  |  |
Derivative in cash flow hedging relationship: |  |  |  |  |  |
Interest rate swaps |  | $ | (629 | ) |  | Interest expense |  | $ | (1,946 | )
|  | For the Year Ended December 31, 2015
|  |  |  | Location of Gain |  | Amount of Gain (Loss)
|  | Amount of Loss |  | (Loss) Reclassified |  | Reclassified from
|  | Recognized in OCI on |  | from Accumulated |  | Accumulated OCI into
|  | Derivatives (Effective |  | OCI into Income |  | Income (Effective
|  | Portion) (1) |  | (Effective Portion) |  | Portion)
(amounts in thousands) |  |  |  |  |  |
Derivative in cash flow hedging relationship: |  |  |  |  |  |
Interest rate swaps |  | $ | (1,534 | ) |  | Interest expense |  | $ | — |
(1) Amounts presented are net of taxes
Summary of Offsetting of Financial Assets and Derivative Assets | The following tables present derivative instruments that are subject to enforceable master netting arrangements. Customers' interest rate swaps with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps with commercial banking customers and residential mortgage loan commitments are not subject to master netting arrangements and are excluded from the table below. Customers has not made a policy election to offset its derivative positions.
| Offsetting of Financial Assets and Derivative Assets at
| December 31, 2017
|  |  | Gross Amounts Not Offset in the Consolidated Balance Sheet
| Gross Amount of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | Financial Instruments |  | Cash Collateral Received |  | Net Amount
(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
| December 31, 2016
|  |  | Gross Amounts Not Offset in the Consolidated Balance Sheet
| Gross Amount of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | Financial Instruments |  | Cash Collateral Received |  | Net Amount
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 4,723 |  |  | $ | — |  |  | $ | 4,723 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,723 |
Summary of Offsetting of Financial Liabilities and Derivative Liabilities |
| Offsetting of Financial Liabilities and Derivative Liabilities at
| December 31, 2017
|  |  |  |  |  |  | Gross Amounts Not Offset in the Consolidated Balance Sheet
| Gross Amount of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheet |  | Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
(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
| December 31, 2016
| Gross Amount of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheet |  | Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
(amounts in thousands) |  |  |  |  |  |  |  |  |  |  |
Description |  |  |  |  |  |  |  |  |  |  |
Interest rate swap derivatives with institutional counterparties | $ | 9,825 |  |  | $ | — |  |  | $ | 9,825 |  |  | $ | — |  |  | $ | 4,472 |  |  | $ | 5,353 |

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