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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 34,300,000 |  |  |  |
Notional Amount | 1,500,000,000 |  | $ 1,500,000,000 |  |
Net (gain) loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax | (2,692,000) | $ (123,000) | (2,188,000) | $ 1,702,000 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 12,500,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 3,155,470,000 |  | 3,155,470,000 |  | $ 3,131,832,000
Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | 240,000 | 6,459,000 | (15,034,000) | 70,228,000 |
Hedging derivative | Fair value hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 1,031,490,000 |  | 1,031,490,000 |  | 708,931,000
Fair Value Hedge Assets | (40,640,000) |  | (40,640,000) |  | (67,314,000)
Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | (8,092,000) | (2,559,000) | 26,674,000 | (41,432,000) |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 8,092,000 | 2,559,000 | (26,674,000) | 41,432,000 |
Derivative Instruments and Hedges, Assets | 1,206,722,000 |  | 1,206,722,000 |  | 841,543,000
Fair Value Hedging Adjustment | 40,640,000 |  | 40,640,000 |  | 67,314,000
Hedging derivative | Fair value hedge | Securities | LIBOR |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 477,500,000 |  | 477,500,000 |  |
Hedging derivative | Fair value hedge | Securities | Federal Funds Rate |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forecasted Notional Amount | 554,000,000.0 |  | 554,000,000.0 |  |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amortization expense, reduction to interest income on loans | 927,000 | 1,000,000.0 | 1,900,000 | 2,100,000 |
Pay fixed and receive variable swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 1,577,735,000 |  | 1,577,735,000 |  | 1,565,916,000
Pay variable and receive fixed swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 1,577,735,000 |  | $ 1,577,735,000 |  | $ 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 |  | 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) | $ 240,000 | 6,318,000 | $ (15,034,000) | 71,667,000 |
Asset derivatives | Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted Average Remaining Maturity |  |  | 5 years 11 months 1 day |  |
Pay Rate (as percent) | 0.53% |  | 0.53% |  |
Derivative, Type of Interest Rate Paid on Swap |  |  | Federal Funds |  |
Forecasted Notional Amount | $ 457,284,000 |  | $ 457,284,000 |  | $ 231,421,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet |  |  | Other assets |  | Other assets
Fair Value Hedge Assets | 11,818,000 |  | $ 11,818,000 |  | $ 4,696,000
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 0 | $ 141,000 | $ 0 | $ (1,439,000) |
Liability derivatives | Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted Average Remaining Maturity |  |  | 5 years 4 months 24 days |  |
Pay Rate (as percent) | 2.68% |  | 2.68% |  |
Derivative, Type of Interest Rate Paid on Swap |  |  | 3 month LIBOR/Federal Funds |  |
Forecasted Notional Amount | $ 574,206,000 |  | $ 574,206,000 |  | $ 477,510,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet |  |  | Other liabilities |  | Other liabilities
Fair Value Hedge Assets | $ (52,458,000) |  | $ (52,458,000) |  | $ (72,010,000)

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