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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

X

- 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

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X

- 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

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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.

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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

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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

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