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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 24, 2018
Derivative [Line Items] |  |  |  |  |
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost |  | $ 2,700,000,000 |  |  |
Weighted Average Remaining Maturity Derivative |  | 4 years 6 months 4 days |  |  |
Pay Rate (as percent) |  | 2.88% |  |  |
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  | Other noninterest income |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ (33,000) | $ 39,000 | $ 65,000 |
Notional amount |  | 1,377,905,000 | 0 |  |
Fair Value Hedges, Net |  | (21,833,000) | 0 |  |
Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income |  | 1,000,000 |  |  |
Notional amount |  |  |  |  | $ 101,000,000
Hedging derivative | Fair value hedge | Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments and Hedges, Assets | [1] | 907,037,000 | 0 |  |
Fair Value Hedging Adjustment | [1] | 7,037,000 | 0 |  |
Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments and Hedges, Assets |  | 513,116,000 | 0 |  |
Fair Value Hedging Adjustment |  | 14,796,000 | 0 |  |
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income |  | $ 2,660,000 | 2,487,000 | (749,000) |
Description of Location of Interest Rate Derivatives on Balance Sheet |  | Other liabilities |  |  |
Weighted Average Remaining Maturity Derivative |  | 3 years 4 months 2 days |  |  |
Pay Rate (as percent) |  | 3.09% |  |  |
Receive Rate |  | 3 month LIBOR |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | $ (1,757,000) | (4,583,000) |  |
Notional amount |  | $ 99,000,000 | 200,000,000 |  |
Liability derivatives | Hedging derivative | Fair value hedge | Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  | Other liabilities |  |  |
Weighted Average Remaining Maturity Derivative |  | 2 years 7 months 17 days |  |  |
Pay Rate (as percent) |  | 2.77% |  |  |
Receive Rate |  | 3 month LIBOR |  |  |
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  | Interest income on loans |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ (7,037,000) | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  | 7,037,000 | 0 | 0 |
Notional amount |  | 900,000,000 | 0 |  |
Fair Value Hedges, Net |  | $ (7,037,000) | 0 |  |
Liability derivatives | Hedging derivative | Fair value hedge | Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  | Other liabilities |  |  |
Weighted Average Remaining Maturity Derivative |  | 8 years 15 days |  |  |
Pay Rate (as percent) |  | 3.08% |  |  |
Receive Rate |  | 3 month LIBOR |  |  |
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  | Interest income on securities |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ (14,796,000) | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  | 14,796,000 | 0 | $ 0 |
Notional amount |  | 477,905,000 | 0 |  |
Fair Value Hedges, Net |  | $ (14,796,000) | $ 0 |  |
[1] | (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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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
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