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Derivatives and Balance Sheet Offsetting (Tables) | 9 Months Ended
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Sep. 30, 2020
Derivative [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the fair value of derivatives, as well as their classification on the Consolidated Balance Sheet at September 30, 2020 and December 31, 2019:
| Asset Derivatives |  | Liability Derivatives
| September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
| (in thousands)
Derivatives designated as hedging instruments:
Interest rate collar | Other assets |  | $ | 35,668 |  |  | Other assets |  | $ | 14,727 |  |  | Other liabilities |  | $ | — |  |  | Other liabilities |  | $ | — |
Derivatives not designated as hedging instruments:
Interest rate swap contracts | Other assets |  | $ | 53,202 |  |  | Other assets |  | $ | 19,144 |  |  | Other liabilities |  | $ | 53,677 |  |  | Other liabilities |  | $ | 19,145 |
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The table below presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss) at September 30, 2020 and 2019:
| Amount of Gain or (Loss) Recognized in Accumulated Other Comprehensive Income on Derivative |  | Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income |  | Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
| Three Months Ended September 30, |  |  |  | Three Months Ended September 30,
| 2020 |  | 2019 |  |  |  | 2020 |  | 2019
| (in thousands)
Interest rate collar | $ | (81) |  |  | $ | 4,088 |  |  | Interest income |  | $ | 2,673 |  |  | $ | 76 |
| Nine Months Ended September 30, |  |  |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  |  |  | 2020 |  | 2019
Interest rate collar | $ | 26,744 |  |  | $ | 19,779 |  |  | Interest income |  | $ | 5,803 |  |  | $ | 76 |
Balance Sheet Offsetting [Table Text Block] | The following tables show the gross interest rate swap contracts, collar agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or other financial instruments. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of over-collateralization are not shown.
| Gross Amounts of Recognized Assets/Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets |  | Gross Amounts Not Offset in the Consolidated Balance Sheets
|  |  |  | Collateral Pledged/Received |  | Net Amount
September 30, 2020 | (in thousands)
Assets |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 53,202 |  |  | $ | — |  |  | $ | 53,202 |  |  | $ | — |  |  | $ | 53,202 |
Interest rate collar | $ | 35,668 |  |  | $ | — |  |  | $ | 35,668 |  |  | $ | (35,668) |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 53,677 |  |  | $ | — |  |  | $ | 53,677 |  |  | $ | (53,677) |  |  | $ | — |
Repurchase agreements | $ | 26,966 |  |  | $ | — |  |  | $ | 26,966 |  |  | $ | (26,966) |  |  | $ | — |
December 31, 2019 |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 19,144 |  |  | $ | — |  |  | $ | 19,144 |  |  | $ | — |  |  | $ | 19,144 |
Interest rate collar | $ | 14,727 |  |  | $ | — |  |  | $ | 14,727 |  |  | $ | (14,727) |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 19,145 |  |  | $ | — |  |  | $ | 19,145 |  |  | $ | (19,145) |  |  | $ | — |
Repurchase agreements | $ | 64,437 |  |  | $ | — |  |  | $ | 64,437 |  |  | $ | (64,437) |  |  | $ | — |
Carrying Value of Securities Pledged As Collateral | The following table summarizes the carrying value of securities pledged as collateral to secure public funds, borrowings and other purposes as permitted or required by law:
|  | September 30, 2020
|  | (in thousands)
To secure public funds |  | $ | 441,379 |
To secure borrowings |  | 111,978 |
Other securities pledged |  | 168,870 |
Total securities pledged as collateral |  | $ | 722,227 |
Available-for-sale Securities [Member] |
Derivative [Line Items] |
Carrying Value of Securities Pledged As Collateral | The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:
|  | Remaining contractual maturity of the agreements
|  | Overnight and continuous |  | Up to 30 days |  | 30 - 90 days |  | Greater than 90 days |  | Total
September 30, 2020 |  | (in thousands)
Class of collateral pledged for repurchase agreements |  |  |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 26,966 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 26,966 |
Gross amount of recognized liabilities for repurchase agreements |  |  |  |  |  |  |  |  |  | 26,966 |
Amounts related to agreements not included in offsetting disclosure |  |  |  |  |  |  |  |  |  | $ | — |

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