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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) |  | $ 16,500,000 |  |  |  |
Net loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax | $ 156,000 |  | $ 1,129,000 | $ 1,858,000 | $ 946,000 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | 8,000,000.0 |  |
Notional Amount |  |  |  |  |  | $ 1,300,000,000
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 3,070,594,000 |  |  | 3,070,594,000 |  | 2,592,778,000
Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ (3,026,000) |  | 1,882,000 | $ 67,202,000 | 8,303,000 |
Hedging derivative | Fair value hedge | Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 7 years 1 month 13 days |  |
Pay Rate (as percent) | 2.26% |  |  | 2.26% |  |
Derivative, Type of Interest Rate Paid on Swap |  |  |  | 3 month LIBOR/Fed Funds |  |
Forecasted Notional Amount | $ 708,931,000 |  |  | $ 708,931,000 |  | 477,905,000
Fair Value Hedge Assets | (77,214,000) |  |  | (77,214,000) |  | (40,778,000)
Derivative Instruments and Hedges, Assets | 853,350,000 |  |  | $ 853,350,000 |  | 551,789,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet |  |  |  | Other liabilities |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (4,996,000) |  | 10,888,000 | $ 36,436,000 | 37,131,000 |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 4,996,000 |  | (10,888,000) | (36,436,000) | (37,131,000) |
Fair Value Hedging Adjustment | 77,214,000 |  |  | 77,214,000 |  | 40,778,000
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 | 231,400,000 |  |  | 231,400,000 |  |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 |  | 0 | 0 | 6,915,000 |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 0 |  | 0 | 0 | (6,915,000) |
Amortization expense, reduction to interest income on loans | 1,200,000 |  |  | 3,300,000 |  |
Pay fixed and receive variable swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 1,535,297,000 |  |  | 1,535,297,000 |  | 1,296,389,000
Pay variable and receive fixed swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 1,535,297,000 |  |  | 1,535,297,000 |  | 1,296,389,000
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ (3,506,000) |  | 1,951,000 | $ 68,161,000 | 9,875,000 |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  |  |  | Other assets |  |
Weighted Average Remaining Maturity |  |  |  | 4 years 2 months 8 days |  |
Pay Rate (as percent) | 0.00% |  |  | 0.00% |  |
Receive Rate |  |  |  | 2.25% minus 1 month LIBOR |  |
Forecasted Notional Amount | $ 1,500,000,000 |  |  | $ 1,500,000,000 |  | 2,800,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 134,853,000 |  |  | 134,853,000 |  | 87,422,000
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 480,000 |  | $ (69,000) | $ (959,000) | $ (1,572,000) |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  |  |  | Other liabilities |  |
Weighted Average Remaining Maturity |  |  |  | 1 year 7 months 2 days |  |
Pay Rate (as percent) | 3.09% |  |  | 3.09% |  |
Receive Rate |  |  |  | 3 month LIBOR |  |
Forecasted Notional Amount | $ 99,000,000 |  |  | $ 99,000,000 |  | 99,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net | $ (4,610,000) |  |  | $ (4,610,000) |  | $ (3,312,000)

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