Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Debt Instrument [Domain]

Schedule Of Fed Funds Purchased And Assets Sold Under Agreements To Repurchase Table [Text Block]

(In thousands)	December 31, 2016		December 31, 2015
Federal funds purchased	$	-	$	50,000
Assets sold under agreements to repurchase		479,425		712,145
Total federal funds purchased and assets sold under agreements to repurchase	$	479,425	$	762,145

Schedule of Repurchase Agreements [Table Text Block]

		December 31, 2016				December 31, 2015
				Repurchase liability				Repurchase liability
			Repurchase	weighted average			Repurchase	weighted average
(Dollars in thousands)			liability	interest rate			liability	interest rate
U.S. Treasury Securities
	Within 30 days	$	32,700	0.85	%	$	-	-	%
	After 90 days		19,819	1.61			-	-
Total U.S. Treasury Securities			52,519	1.14			-	-
Obligations of U.S. government
	sponsored entities
	Within 30 days		95,720	1.00			243,708	0.07
	After 30 to 90 days		142,299	0.91			-	-
	After 90 days		25,380	1.08			23,366	0.60
Total obligations of U.S. government sponsored entities			263,399	0.96			267,074	0.12
Mortgage-backed securities
	Within 30 days		39,108	1.05			124,878	0.72
	After 30 to 90 days		58,552	0.94			154,582	0.75
	After 90 days		54,560	1.09			142,441	1.84
Total mortgage-backed securities			152,220	1.02			421,901	1.11
Collateralized mortgage obligations
	Within 30 days		11,287	0.28			10,298	0.28
	After 30 to 90 days		-	-			12,872	0.75
Total collateralized mortgage
	obligations		11,287	0.28			23,170	0.54
Total		$	479,425	0.98	%	$	712,145	0.72	%

Schedule of Notes Payable [Table Text Block]

(In thousands)		December 31, 2016		December 31, 2015
Advances with the FHLB with maturities ranging from 2017 through 2029 paying interest at
	monthly fixed rates ranging from 0.81% to 4.19 % (2015 - 0.41% to 4.19%)	$	608,193	$	747,072
Advances with the FHLB with maturities ranging from 2018 through 2019 paying interest monthly
	at a floating rates ranging from 0.22% to 0.34% over the 1 month LIBOR		34,164		-
Advances with the FHLB with maturities ranging from 2017 through 2019 paying interest quarterly
	at a floating rate from (0.01)% to 0.24% over the 3 month LIBOR
	(2015 - 0.24% over the 3 month LIBOR)		30,313		14,429
Unsecured senior debt securities maturing on 2019 paying interest semiannually at a
	fixed rate of 7.00%, net of debt issuance costs of $5,212 (2015 - $7,296)		444,788		442,704
Junior subordinated deferrable interest debentures (related to trust preferred securities)
	with maturities ranging from 2027 to 2034 with fixed interest rates ranging from
	6.125% to 8.327%, net of debt issuance costs of $476 (2015 - $505)		439,323		439,295
Others			18,071		19,008
Total notes payable		$	1,574,852	$	1,662,508

Maturity Distribution Of Debt Securities [Text Block]

	Assets sold under			Short-term
(In thousands)	agreements to repurchase			borrowings	Notes payable		Total
Year
2017	$	479,425	$	1,200	$	155,122	$	635,747
2018		-		-		183,920		183,920
2019		-		-		564,699		564,699
2020		-		-		112,309		112,309
2021		-		-		21,694		21,694
Later years		-		-		537,108		537,108
Total borrowings	$	479,425	$	1,200	$	1,574,852	$	2,055,477

Federal Funds Purchased And Securities Sold Under Agreements To Repurchase [Member]

Schedule Of Maximum Aggregate Balance Average Aggregate Balance And Weighted Average Interest Rate [Text Block]

Federal funds purchased and assets sold under agreements to repurchase:
(Dollars in thousands)			2016			2015
Maximum aggregate balance outstanding at any month-end		$	954,253		$	1,224,064
Average monthly aggregate balance outstanding		$	757,230		$	1,023,905
Weighted average interest rate:
	For the year		1.01	%		0.73	%
	At December 31		1.12	%		0.88	%

Short-term Debt [Member]

Schedule Of Maximum Aggregate Balance Average Aggregate Balance And Weighted Average Interest Rate [Text Block]

Other short-term borrowings:
(Dollars in thousands)			2016			2015
Balance outstanding at the end of the period		$	1,200		$	1,200
Maximum aggregate balance outstanding at any month-end		$	31,200		$	128,200
Average monthly aggregate balance outstanding		$	6,266		$	4,501
Weighted average interest rate:
	For the year		2.15	%		2.69	%
	At December 31		9.00	%		9.00	%