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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 34,300,000 |  |  |  |
Net (gain) loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax | (4,338,000) | $ 156,000 | $ (6,526,000) | $ 1,858,000 |
Notional Amount | 1,500,000,000 |  | 1,500,000,000 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 10,600,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 3,269,178,000 |  | 3,269,178,000 |  | $ 3,131,832,000
Cash flow hedge | Hedging derivative |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | 0 | (3,026,000) | $ (15,034,000) | 67,202,000 |
Cash flow hedge | Hedging derivative | Asset derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  |  | Other assets |  | Other assets
Forecasted Notional Amount | 0 |  | $ 0 |  | $ 1,500,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 0 |  | 124,585,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | 0 | (3,506,000) | (15,034,000) | 68,161,000 |
Cash flow hedge | Hedging derivative | Liability derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | 0 | 480,000 | 0 | (959,000) |
Fair value hedge | Hedging derivative |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 1,031,490,000 |  | 1,031,490,000 |  | 708,931,000
Fair Value Hedge Assets | (36,790,000) |  | (36,790,000) |  | (67,314,000)
Fair value hedge | Hedging derivative | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 3,850,000 | 4,996,000 | 30,524,000 | (36,436,000) |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (3,850,000) | (4,996,000) | (30,524,000) | 36,436,000 |
Derivative Instruments and Hedges, Assets | 1,198,990,000 |  | 1,198,990,000 |  | 841,543,000
Fair Value Hedging Adjustment | 36,790,000 |  | 36,790,000 |  | 67,314,000
Fair value hedge | Hedging derivative | Securities | Asset derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | $ 464,762,000 |  | $ 464,762,000 |  | $ 231,421,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet |  |  | Other assets |  | Other assets
Weighted Average Remaining Maturity |  |  | 5 years 7 months 28 days |  |
Pay Rate (as percent) | 0.54% |  | 0.54% |  |
Derivative, Type of Interest Rate Paid on Swap |  |  | Federal Funds |  |
Fair Value Hedge Assets | $ 11,989,000 |  | $ 11,989,000 |  | $ 4,696,000
Fair value hedge | Hedging derivative | Securities | Liability derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | $ 566,728,000 |  | $ 566,728,000 |  | $ 477,510,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet |  |  | Other liabilities |  | Other liabilities
Weighted Average Remaining Maturity |  |  | 5 years 1 month 24 days |  |
Pay Rate (as percent) | 2.71% |  | 2.71% |  |
Derivative, Type of Interest Rate Paid on Swap |  |  | 3 month LIBOR/Federal Funds |  |
Fair Value Hedge Assets | $ (48,779,000) |  | $ (48,779,000) |  | $ (72,010,000)
Fair value hedge | Hedging derivative | Securities | LIBOR |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 477,500,000 |  | 477,500,000 |  |
Fair value hedge | Hedging derivative | Securities | Federal Funds Rate |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 554,000,000 |  | 554,000,000 |  |
Fair value hedge | Hedging derivative | Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amortization expense, reduction to interest income on loans | $ 726,000 | $ 1,200,000 | $ 2,600,000 | $ 3,300,000 |

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