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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jul. 25, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |  |  |
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost |  | $ 1.7 |  | $ 1.7 |  |  |
Notional Amount |  |  |  |  |  | $ 375,000,000 |
Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  |  |  | Other noninterest income |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (14,000) | $ 1,000 | $ (34,000) | $ 13,000 |  |
Notional Amount |  | 1,637,594,000 |  | 1,637,594,000 |  |  | $ 1,497,250,000
Hedging derivative | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) |  | $ 950,000 | 1,161,000 | $ 2,670,000 | 1,068,000 |  |
Hedging derivative | Fair value hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 3 years 9 months 22 days |  |  |
Pay Rate (as percent) |  | 2.82% |  | 2.82% |  |  |
Forecasted Notional Amount |  | $ 679,145,000 |  | $ 679,145,000 |  |  | 0
Fair Value Hedge Assets |  | $ 1,358,000 |  | $ 1,358,000 |  |  | 0
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement |  |  |  | Interest income on securities |  |  |
Hedging derivative | Fair value hedge | Loans |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 2 years 9 months 4 days |  |  |
Pay Rate (as percent) |  | 2.79% |  | 2.79% |  |  |
Receive Rate |  |  |  | 3 month LIBOR |  |  |
Forecasted Notional Amount |  | $ 525,000,000 |  | $ 525,000,000 |  |  | 0
Fair Value Hedge Assets |  | 1,122,000 |  | 1,122,000 |  |  | 0
Derivative Instruments and Hedges, Assets | [1] | 523,878,000 |  | 523,878,000 |  |  | 0
Fair Value Hedging Adjustment | [1] | (1,122,000) |  | $ (1,122,000) |  |  | 0
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 assets |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  | (1,122,000) | 0 | $ (1,122,000) | 0 |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ 1,122,000 | 0 | $ 1,122,000 | 0 |  |
Hedging derivative | Fair value hedge | Securities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Weighted Average Remaining Maturity |  |  |  | 7 years 4 months 21 days |  |  |
Pay Rate (as percent) |  | 2.89% |  | 2.89% |  |  |
Receive Rate |  |  |  | 3 month LIBOR |  |  |
Forecasted Notional Amount |  | $ 154,145,000 |  | $ 154,145,000 |  |  | 0
Fair Value Hedge Assets |  | 236,000 |  | 236,000 |  |  | 0
Derivative Instruments and Hedges, Assets |  | 153,543,000 |  | 153,543,000 |  |  | 0
Fair Value Hedging Adjustment |  | (236,000) |  | $ (236,000) |  |  | 0
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 assets |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  | 1,343,000 | 0 | $ (236,000) | 0 |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ (1,343,000) | $ 0 | $ 236,000 | $ 0 |  |
Asset derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other assets |  |  |
Weighted Average Remaining Maturity |  |  |  | 2 years 7 months 6 days |  |  |
Pay Rate (as percent) |  | 2.48% |  | 2.48% |  |  |
Receive Rate |  |  |  | 3 month LIBOR |  |  |
Forecasted Notional Amount |  | $ 101,000,000 |  | $ 101,000,000 |  |  | 0
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | $ 618,000 |  | $ 618,000 |  |  | 0
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  |  |  | Other assets |  |  |
Weighted Average Remaining Maturity |  |  |  | 3 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 |  |  | 200,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | $ (1,005,000) |  | $ (1,005,000) |  |  | $ (4,583,000)
[1] | The carrying amount as shown represents the designated last-of-layer. At June 30, 2018, the total amortized cost basis of the closed portfolio of loans designated in this hedging relationship was $1.7 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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