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Derivative Instruments - Non-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] |  |  |  |  |  |
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
Estimated Fair Value | (129,000) |  | (129,000) |  |  | (95,000)
Not Designated as Hedging Instrument | Pay fixed / receive variable swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 818,797,000 |  | 818,797,000 |  |  | 748,625,000
Estimated Fair Value | 21,300,000 |  | 21,300,000 |  |  | 13,771,000
Not Designated as Hedging Instrument | Pay variable / receive fixed swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 818,797,000 |  | 818,797,000 |  |  | 748,625,000
Estimated Fair Value | (23,349,000) |  | (23,349,000) |  |  | (13,866,000)
Not Designated as Hedging Instrument | Cash Settlements [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 0 |  | 0 |  |  | 0
Estimated Fair Value | $ 1,920,000 |  | $ 1,920,000 |  |  | $ 0

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Definition Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References No definition available. + Details
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