Derivatives - (Details) $ in Thousands	Dec. 31, 2016 USD ($) derivative
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Estimated amount of unrealized gains or losses expected to be reclassified as interest expense in next fiscal year	$ 9,244
Number of derivative financial instruments | derivative	31
Combined notional amount	$ 2,109,486
Credit risk derivative, fair value of derivatives in a net liability position	2,836
Estimated termination value on settlement	$ 2,836