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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) |  | $ 16,500,000 |
Notional Amount |  | 1,300,000,000 |
Loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax | $ 504,000 | 1,825,000 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 4,700,000 |  |
Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 3,236,566,000 |  | $ 3,131,832,000
Hedging derivative | Cash flow hedge |  |  |
Derivative [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | (15,274,000) | 63,769,000 |
Hedging derivative | Fair value hedge |  |  |
Derivative [Line Items] |  |  |
Forecasted Notional Amount | 708,931,000 |  | 708,931,000
Fair Value Hedge Assets | (32,548,000) |  | (67,314,000)
Hedging derivative | Fair value hedge | Securities |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 34,766,000 | (38,873,000) |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (34,766,000) | 38,873,000 |
Derivative Instruments and Hedges, Assets | 804,207,000 |  | 841,543,000
Fair Value Hedging Adjustment | 32,548,000 |  | 67,314,000
Hedging derivative | Fair value hedge | Securities | LIBOR |  |  |
Derivative [Line Items] |  |  |
Forecasted Notional Amount | 477,500,000 |  |
Hedging derivative | Fair value hedge | Securities | Federal Funds Rate |  |  |
Derivative [Line Items] |  |  |
Forecasted Notional Amount | 231,400,000 |  |
Hedging derivative | Fair value hedge | Loans |  |  |
Derivative [Line Items] |  |  |
Amortization expense, reduction to interest income on loans | 924,000 | 1,100,000 |
Pay fixed and receive variable swaps | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 1,618,283,000 |  | 1,565,916,000
Pay variable and receive fixed swaps | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 1,618,283,000 |  | 1,565,916,000
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |
Derivative [Line Items] |  |  |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet | Other assets |  |
Weighted Average Remaining Maturity | 3 years 8 months 8 days |  |
Pay Rate (as percent) | 0.00% |  |
Receive Rate | 2.25% minus one-month LIBOR |  |
Forecasted Notional Amount | $ 1,500,000,000 |  | 1,500,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 100,564,000 |  | 124,585,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ (15,274,000) | 65,349,000 |
Asset derivatives | Hedging derivative | Fair value hedge | Securities |  |  |
Derivative [Line Items] |  |  |
Weighted Average Remaining Maturity | 8 years 4 months 2 days |  |
Pay Rate (as percent) | 0.58% |  |
Forecasted Notional Amount | $ 231,421,000 |  | 231,421,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet | Other assets |  |
Derivative, Type of Interest Rate Paid on Swap | Federal Funds |  |
Fair Value Hedge Assets | $ 17,181,000 |  | 4,696,000
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |
Derivative [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 0 | $ (1,580,000) |
Liability derivatives | Hedging derivative | Fair value hedge | Securities |  |  |
Derivative [Line Items] |  |  |
Weighted Average Remaining Maturity | 5 years 9 months 14 days |  |
Pay Rate (as percent) | 3.08% |  |
Forecasted Notional Amount | $ 477,510,000 |  | 477,510,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet | Other liabilities |  |
Derivative, Type of Interest Rate Paid on Swap | 3 month LIBOR |  |
Fair Value Hedge Assets | $ (49,729,000) |  | $ (72,010,000)

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