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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost |  |  |  |  |  | $ 2,700,000,000
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  | Other noninterest income | Other noninterest income | Other noninterest income | Other noninterest income |
Derivative, Gain (Loss) on Derivative, Net |  | $ (89,000) | $ (14,000) | $ (102,000) | $ (34,000) |
Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) |  | $ 6,944,000 | 950,000 | $ 6,421,000 | 2,670,000 |
Hedging derivative | Fair value hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 7 years 6 months 18 days |  |
Pay Rate (as percent) |  | 3.08% |  | 3.08% |  |
Forecasted Notional Amount |  | $ 477,905,000 |  | $ 477,905,000 |  | 1,377,905,000
Fair Value Hedge Assets |  | $ (41,039,000) |  | $ (41,039,000) |  | (21,833,000)
Hedging derivative | Fair value hedge | Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 7 years 6 months 18 days |  |
Pay Rate (as percent) |  | 3.08% |  | 3.08% |  |
Receive Rate |  |  |  | 3 month LIBOR |  |
Forecasted Notional Amount |  | $ 477,905,000 |  | $ 477,905,000 |  | 477,905,000
Fair Value Hedge Assets |  | (41,039,000) |  | (41,039,000) |  | (14,796,000)
Derivative Instruments and Hedges, Assets |  | 513,052,000 |  | 513,052,000 |  | 515,063,000
Fair Value Hedging Adjustment |  | 41,039,000 |  | $ 41,039,000 |  | 14,796,000
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  |  |  | Interest income on securities |  |
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 |  | 15,963,000 | 1,343,000 | $ 26,243,000 | (236,000) |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | (15,963,000) | (1,343,000) | (26,243,000) | 236,000 |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Forecasted Notional Amount |  | 0 |  | 0 |  | 900,000,000
Fair Value Hedge Assets |  | 0 |  | 0 |  | (7,037,000)
Derivative Instruments and Hedges, Assets | [1] | 0 |  | 0 |  | 907,037,000
Fair Value Hedging Adjustment | [1] | 0 |  | $ 0 |  | $ 7,037,000
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  |  |  | Interest income on loans |  |
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 |  | 2,061,000 | (1,122,000) | $ 6,915,000 | (1,122,000) |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | (2,061,000) | 1,122,000 | (6,915,000) | 1,122,000 |
Swap termination payment |  | 14,000,000 |  |  |  |
Fair value hedging adjustment |  | 14,000,000 |  | 14,000,000 |  |
Amortization expense, reduction to interest income on loans |  | 445,000 |  | $ 445,000 |  |
Pay fixed and receive variable swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other assets |  | Other assets
Pay variable and receive fixed swaps | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other liabilities |  | Other liabilities
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) |  | $ 7,924,000 | 0 | $ 7,924,000 | 0 |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other assets |  |
Weighted Average Remaining Maturity |  |  |  | 2 years 4 months 2 days |  |
Pay Rate (as percent) |  | 0.00% |  | 0.00% |  |
Receive Rate |  |  |  | 2.75% minus 1 month LIBOR |  |
Forecasted Notional Amount |  | $ 1,300,000,000 |  | $ 1,300,000,000 |  | $ 0
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | 34,428,000 |  | 34,428,000 |  | 0
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) |  | $ (980,000) | $ 950,000 | $ (1,503,000) | $ 2,670,000 |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other liabilities |  |
Weighted Average Remaining Maturity |  |  |  | 2 years 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 |  | $ (3,793,000) |  | $ (3,793,000) |  | $ (1,757,000)
[1] | The carrying amount as shown represents the designated last-of-layer. At December 31, 2018, the total amortized cost basis of the closed portfolio of loans designated in these hedging relationships was $2.7 billion.

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