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Derivative Instruments - Hedge Derivatives (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost |  | $ 2,700,000,000 | $ 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 |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ (13,000) | (20,000) |
Hedging derivative | Cash flow hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) |  | $ (523,000) | 1,720,000 |
Hedging derivative | Fair value hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted Average Remaining Maturity |  | 4 years 3 months 4 days |  |
Pay Rate (as percent) |  | 2.88% |  |
Forecasted Notional Amount |  | $ 1,377,905,000 |  | $ 1,377,905,000
Fair Value Hedge Assets |  | $ (36,967,000) |  | (21,833,000)
Hedging derivative | Fair value hedge | Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted Average Remaining Maturity |  | 2 years 4 months 21 days |  |
Pay Rate (as percent) |  | 2.77% |  |
Receive Rate |  | 3 month LIBOR |  |
Forecasted Notional Amount |  | $ 900,000,000 |  | 900,000,000
Fair Value Hedge Assets |  | (11,891,000) |  | (7,037,000)
Derivative Instruments and Hedges, Assets | [1] | 911,891,000 |  | 907,037,000
Fair Value Hedging Adjustment | [1] | $ 11,891,000 |  | 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 |  | $ 4,854,000 | 0 |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ (4,854,000) | 0 |
Hedging derivative | Fair value hedge | Securities |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted Average Remaining Maturity |  | 7 years 9 months 18 days |  |
Pay Rate (as percent) |  | 3.08% |  |
Receive Rate |  | 3 month LIBOR |  |
Forecasted Notional Amount |  | $ 477,905,000 |  | 477,905,000
Fair Value Hedge Assets |  | (25,076,000) |  | (14,796,000)
Derivative Instruments and Hedges, Assets |  | 528,900,000 |  | 513,116,000
Fair Value Hedging Adjustment |  | $ 25,076,000 |  | 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 |  | $ 10,280,000 | (1,579,000) |
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ (10,280,000) | $ 1,579,000 |
Liability derivatives | Hedging derivative | Cash flow hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet |  | Other liabilities |  |
Weighted Average Remaining Maturity |  | 3 years 1 month 6 days |  |
Pay Rate (as percent) |  | 3.09% |  |
Receive Rate |  | 3 month LIBOR |  |
Forecasted Notional Amount |  | $ 99,000,000 |  | 99,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | $ (2,466,000) |  | $ (1,757,000)
[1] | The carrying amount as shown represents the designated last-of-layer. At March 31, 2019 and 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 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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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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