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Derivative Instruments - Non-hedge Derivatives (Details) - Non-hedge derivatives - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
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	$ (20,000)	$ 13,000
Notional Amount	1,673,302,000		$ 1,497,250,000
Estimated Fair Value	(115,000)		(95,000)
Pay fixed / receive variable swaps
Derivative [Line Items]
Notional Amount	836,651,000		748,625,000
Estimated Fair Value	18,269,000		13,771,000
Pay variable / receive fixed swaps
Derivative [Line Items]
Notional Amount	836,651,000		748,625,000
Estimated Fair Value	$ (18,384,000)		$ (13,866,000)

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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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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://www.xbrl.org/2003/role/presentationRef
-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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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 815
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-Paragraph 4D
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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-Name Accounting Standards Codification
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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