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Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Value |  |  | $ 260,000 |  |  | $ 260,000 |  | $ 405,700
Fair Value |  |  | (18,710) |  |  | (18,710) |  | (30,390)
Interest expense |  |  | 12,115 | $ 16,518 |  | 36,640 | $ 57,540 |
Payments for swap termination payments |  | $ 46,100 |  |  |  |  |  |
Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Value |  |  | 50,000 |  |  | $ 50,000 |  | $ 88,200
Weighted Average Remaining Maturity (years) |  |  |  |  |  | 3 years 1 month 6 days |  | 3 years 1 month 6 days
Fair Value |  |  | $ (2,608) |  |  | $ (2,608) |  | $ (6,072)
Weighted-Average Rate |  |  | 2.33% |  |  | 2.33% |  | 2.54%
Cash collateral received |  |  |  |  |  |  |  | $ 19,300
Cash collateral pledged |  |  |  |  |  |  |  | 30,600
Loans | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Weighted Average Remaining Maturity (years) |  |  |  |  |  | 12 years 4 months 9 days |  |
Securities available-for-sale | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Fair value hedging adjustment |  |  |  |  | $ 6,064 | $ 2,606 |  |
Securities available-for-sale | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Value |  |  | $ 50,000 |  |  | $ 50,000 |  | $ 88,200
Weighted Average Remaining Maturity (years) |  |  |  |  |  | 3 years 1 month 6 days |  | 3 years 1 month 6 days
Fair Value |  |  | $ (2,608) |  |  | $ (2,608) |  | $ (6,072)
Weighted-Average Rate |  |  | 2.33% |  |  | 2.33% |  | 2.54%
Payments for swap termination payments | $ 1,900 |  |  |  |  |  |  |
Derivative Instrument, Notional Amount, Terminated | $ 38,200 |  |  |  |  |  |  |
3-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Value |  |  | $ 110,000 |  |  | $ 110,000 |  | $ 110,000
Weighted Average Remaining Maturity (years) |  |  |  |  |  | 5 years 3 months 18 days |  | 6 years 1 month 6 days
Fair Value |  |  | $ (10,563) |  |  | $ (10,563) |  | $ (15,727)
Derivative, variable interest rate |  |  | 2.88% |  |  | 2.88% |  | 2.88%
1-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Value |  |  | $ 100,000 |  |  | $ 100,000 |  | $ 100,000
Weighted Average Remaining Maturity (years) |  |  |  |  |  | 2 years 2 months 12 days |  | 3 years
Fair Value |  |  | $ (5,449) |  |  | $ (5,449) |  | $ (7,951)
Derivative, variable interest rate |  |  | 2.88% |  |  | 2.88% |  | 2.88%

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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