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Derivative Instruments - Non-hedge Derivatives (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
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) | $ (20) |
Notional Amount | 2,193,298 |  | $ 2,119,448
Estimated Fair Value | $ (141) |  | (128)
Assets |  |  |
Derivative [Line Items] |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other assets |  |
Notional Amount | $ 1,096,649 |  | 1,059,724
Estimated Fair Value | $ 24,555 |  | 22,273
Liabilities |  |  |
Derivative [Line Items] |  |  |
Description of Location of Interest Rate Derivatives on Balance Sheet | Other liabilities |  |
Notional Amount | $ 1,096,649 |  | 1,059,724
Estimated Fair Value | $ (24,696) |  | $ (22,401)

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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 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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- Definition Description of where the net gain (loss) on interest rate derivatives are reported in the statement of income or other statement of financial performance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(1),(b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(7)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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