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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 16, 2020 | Mar. 31, 2020
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ (1,109,000) | $ (80,000) | $ (33,000) |  |
Gain (loss) on cash flow hedges reclassified from other comprehensive income into net income, net of tax | 5,542,000 | 1,588,000 | (657,000) |  |
Amortization | 2,300,000 | 2,700,000 | 3,000,000.0 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 6,600,000 |  |  |  |
Swap Termination Payment | 14,000,000.0 |  |  |  |
Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income | 16,500,000 |  |  |  |
Notional |  |  |  | $ 99,000,000.0 | $ 1,300,000,000
Gain (loss) on cash flow hedges reclassified from other comprehensive income into net income, net of tax | 4,700,000 |  |  |  |
Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income | 65,426,000 | (2,581,000) | 2,660,000 |  |
Hedging derivative | Fair value hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amortization | 4,300,000 | 2,700,000 |  |  |
Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments and Hedges, Assets | 841,543,000 | 551,789,000 |  |  |
Fair Value Hedging Adjustment | 67,314,000 | 40,778,000 |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | (26,536,000) | (25,982,000) | (14,796,000) |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 26,536,000 | 25,982,000 | 14,796,000 |  |
Notional | 708,931,000 | 477,905,000 |  |  |
Fair Value Hedges, Net | (67,314,000) | (40,778,000) |  |  |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 0 | (6,915,000) | (7,037,000) |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 6,915,000 | 7,037,000 |  |
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income | $ 62,979,000 | (1,432,000) | 0 |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other assets |  |  |  |
Pay Rate (as percent) | 0.00% |  |  |  |
Receive Rate | 2.25% minus 1 month LIBOR |  |  |  |
Notional | $ 1,500,000,000 | 2,800,000,000 |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | $ 124,585,000 | 87,422,000 |  |  |
Weighted Average Remaining Maturity Derivative | 3 years 11 months 4 days |  |  |  |
Asset derivatives | Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other assets |  |  |  |
Pay Rate (as percent) | 0.58% |  |  |  |
Notional | $ 231,421,000 | 0 |  |  |
Weighted Average Remaining Maturity Derivative | 8 years 7 months 2 days |  |  |  |
Derivative, Underlying Basis | Federal funds |  |  |  |
Fair Value Hedge Assets | $ 4,696,000 | 0 |  |  |
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income | $ 2,447,000 | (1,149,000) | $ 2,660,000 |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other liabilities |  |  |  |
Pay Rate (as percent) | 0.00% |  |  |  |
Notional | $ 0 | 99,000,000 |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | $ 0 | (3,312,000) |  |  |
Liability derivatives | Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other liabilities |  |  |  |
Pay Rate (as percent) | 3.08% |  |  |  |
Notional | $ 477,510,000 | 477,905,000 |  |  |
Weighted Average Remaining Maturity Derivative | 6 years 14 days |  |  |  |
Derivative, Underlying Basis | 3 month LIBOR |  |  |  |
Fair Value Hedge Liabilities | $ (72,010,000) | $ (40,778,000) |  |  |

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