Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Debt Instruments [Abstract]

Schedule Of Repurchase Agreement Counterparty [Table Text Block]

	December 31,
	2017				2016
			Fair Value of				Fair Value of
	Borrowing		Underlying		Borrowing		Underlying
	Balance		Collateral		Balance		Collateral
	(In thousands)
PR Cash and Money Market Fund	$	-	$	-	$	70,010	$	74,538
JP Morgan Chase Bank NA		82,500		88,974		350,219		376,674
Credit Suisse Securities (USA) LLC		-		-		232,000		249,286
Federal Home Loan Bank		110,000		116,509		-		-
Total	$	192,500	$	205,483	$	652,229	$	700,498

Schedule of Repurchase Agreement by Maturity [Table text Block]

			Weighted-
	Borrowing		Average		Maturity
Year of Maturity	Balance		Coupon	Settlement Date	Date
	(In thousands)
2018		82,500	1.42%	12/30/2015	4/29/2018
2019		50,000	1.72%	3/2/2017	9/3/2019
2020		60,000	1.85%	3/2/2017	3/2/2020
	$	192,500	1.63%

Schedule of Repurchase Agreements [Table]

	December 31, 2017
					Market Value of Underlying Collateral
			Weighted		FNMA and
	Repurchase		Average		FHLMC
	Liability		Rate		Certificates		Total
	(Dollars in thousands)
Over 90 days		192,500		1.63%		205,483		205,483
Total	$	192,500		1.63%	$	205,483	$	205,483

	December 31, 2016
					Market Value of Underlying Collateral
			Weighted		FNMA and					US Treasury
	Repurchase		Average		FHLMC		GNMA			Treasury
	Liability		Rate		Certificates		Certificates			Notes	Total
	(Dollars in thousands)
Less than 90 days	$	349,729	$	3.35%		248,288	$	75,536	$	48,954	$	372,778
Over 90 days		302,500		1.44%		327,627		93		-		327,720
Total	$	652,229		2.47%	$	575,915	$	75,629		48,954		700,498

Repurchased Agreements Other Details[Table Text Block]

	December 31,
	2017		2016
	(In thousands)
Average daily aggregate balance outstanding	$	393,133	$	663,845
Maximum outstanding balance at any month-end	$	606,210	$	902,500
Weighted average interest rate during the year		1.80%		2.83%
Weighted average interest rate at year end		1.63%		2.47%

Federal Home Loan Bank Advances Maturities Summary [Table Text Block]

			Weighted-
		Borrowing	Average		Maturity
Year of Maturity		Balance	Coupon	Settlement Date	Date
		(In thousands)
2018		30,000	2.19%	1/16/2013	1/16/2018
		25,000	2.18%	1/16/2013	1/16/2018
		35,113	1.49%	12/1/2017	1/22/2018
		90,113
2020		9,208	2.59%	7/19/2013	7/20/2020
	$	99,321	1.98%