Derivative Instruments - Credit Risk and Credit-Risk-Related Contingent Feature (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) institution	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Derivative asset	$ 41,341	$ 48,186
Fair value of derivative assets	41,341	48,186
Derivative liability	$ 14,895	13,848
Moody's, Aa3 Rating
Derivative [Line Items]
Number of financial institutions company does transactions with \| institution	1
Moody's, A1 Rating
Derivative [Line Items]
Number of financial institutions company does transactions with \| institution	4
Moody's, A3 Rating
Derivative [Line Items]
Number of financial institutions company does transactions with \| institution	1
Derivatives designated as hedging instruments: \| Interest rate swaps
Derivative [Line Items]
Fair value of derivative assets	$ 12,733	$ 6,046

Number Of Financial Institutions With Which The Company Has Transactions

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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+ References

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+ References

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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

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