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Derivative Instruments - Non-hedge Derivatives (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
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 | $ (44) | $ (8) | $ (146) | $ (42) |
Notional Amount | 2,539,760 |  | 2,539,760 |  | $ 2,119,448
Estimated Fair Value | $ (274) |  | $ (274) |  | $ (128)
Assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other assets |  | Other assets |  | Other assets
Notional Amount | $ 1,269,880 |  | $ 1,269,880 |  | $ 1,059,724
Estimated Fair Value | $ 56,846 |  | $ 56,846 |  | $ 22,273
Liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other liabilities |  | Other liabilities |  | Other liabilities
Notional Amount | $ 1,269,880 |  | $ 1,269,880 |  | $ 1,059,724
Estimated Fair Value | $ (57,120) |  | $ (57,120) |  | $ (22,401)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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