Repurchase Agreement Borrowings Repurchase Agreement Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Transfers of Certain Financial Assets Accounted for as Secured Borrowings [Abstract]

Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block]

The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity and collateral pledged at December 31, 2017 and December 31, 2016:

	December 31, 2017
(In thousands)	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
U.S. government and agency securities	$	182,185	$	—	$	—	$	1,104	$	183,289
	December 31, 2016
(In thousands)	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
U.S. government and agency securities	$	208,691	$	—	$	—	$	301,104	$	509,795