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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 16,500,000 |  |  |  |  |
Net loss (gain) on cash flow hedges reclassified from other comprehensive income into net income, net of tax | (123,000) | $ 73,000 | $ 1,702,000 | $ (183,000) |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 8,100,000 |  |  |
Notional Amount |  |  |  |  |  | $ 1,300,000,000
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 3,053,030,000 |  | 3,053,030,000 |  | $ 2,592,778,000 |
Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 6,459,000 | 6,944,000 | $ 70,228,000 | 6,421,000 |  |
Hedging derivative | Fair value hedge | Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  | 6 years 6 months 14 days |  |  |
Pay Rate (as percent) | 3.08% |  | 3.08% |  |  |
Derivative, Type of Interest Rate Paid on Swap |  |  | 3 month LIBOR |  |  |
Forecasted Notional Amount | $ 477,905,000 |  | $ 477,905,000 |  | 477,905,000 |
Fair Value Hedge Assets | (82,210,000) |  | (82,210,000) |  | (40,778,000) |
Derivative Instruments and Hedges, Assets | 591,147,000 |  | $ 591,147,000 |  | 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 | 2,559,000 | 15,963,000 | $ 41,432,000 | 26,243,000 |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | (2,559,000) | (15,963,000) | (41,432,000) | (26,243,000) |  |
Fair Value Hedging Adjustment | 82,210,000 |  | 82,210,000 |  | 40,778,000 |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 2,061,000 | 0 | 6,915,000 |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 0 | (2,061,000) | 0 | (6,915,000) |  |
Amortization expense, reduction to interest income on loans | 1,000,000.0 |  | 2,100,000 |  |  |
Pay fixed and receive variable swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 1,526,515,000 |  | 1,526,515,000 |  | 1,296,389,000 |
Pay variable and receive fixed swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 1,526,515,000 |  | 1,526,515,000 |  | 1,296,389,000 |
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 6,318,000 | 7,924,000 | $ 71,667,000 | 7,924,000 |  |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  |  | Other assets |  |  |
Weighted Average Remaining Maturity |  |  | 4 years 5 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 | 142,560,000 |  | 142,560,000 |  | 87,422,000 |
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 141,000 | $ (980,000) | $ (1,439,000) | $ (1,503,000) |  |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  |  | Other liabilities |  |  |
Weighted Average Remaining Maturity |  |  | 1 year 10 months 6 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 | $ (5,261,000) |  | $ (5,261,000) |  | $ (3,312,000) |

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