Repurchase Agreements (Tables)

12 Months Ended

Dec. 31, 2015

Repurchase Agreements [Abstract]

Schedule of Repurchase Agreements [Table Text Block]

The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in short-term borrowings in the Consolidated Balance Sheets as of December 31, 2015 and December 31, 2014 is presented in the following tables.

	December 31, 2015
	Remaining Contractual Maturity of the Agreements
(Dollars in thousands)	Overnight and continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Repurchase agreements:
U.S. Treasury	$	592,182	$	—	$	—	$	25,724	$	617,906
Government agency	—		—		—		4,276		4,276
Total borrowings	$	592,182	$	—	$	—	$	30,000	$	622,182
Gross amount of recognized liabilities for repurchase agreements									$	622,182
	December 31, 2014
	Remaining Contractual Maturity of the Agreements
	Overnight and continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
Repurchase agreements:
U.S. Treasury	$	162,925	$	—	$	—	$	23,086	$	186,011
Government agency	—		—		—		6,914		6,914
Mortgage-backed securities	131,501		—		—		—		131,501
Total borrowings	$	294,426	$	—	$	—	$	30,000	$	324,426
Gross amount of recognized liabilities for repurchase agreements									$	324,426