Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

Debt Instrument [Domain]

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

(In thousands)	December 31, 2018		December 31, 2017
Assets sold under agreements to repurchase	$	281,529	$	390,921
Total assets sold under agreements to repurchase	$	281,529	$	390,921

Schedule of Repurchase Agreements [Table Text Block]

		December 31, 2018				December 31, 2017
				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	$	138,689	2.56	%	$	148,516	1.70	%
	After 30 to 90 days		79,374	2.47			87,357	1.70
	After 90 days		19,558	2.72			43,500	2.00
Total U.S. Treasury securities			237,621	2.54			279,373	1.75
Obligations of U.S. government
	sponsored entities
	Within 30 days		-	-			30,656	1.77
	After 30 to 90 days		6,055	2.45			19,463	1.48
	After 90 days		-	-			15,937	1.60
Total obligations of U.S. government sponsored entities			6,055	2.45			66,056	1.64
Mortgage-backed securities
	Within 30 days		6,859	1.15			31,383	1.51
	After 90 days		20,465	2.75			-	-
Total mortgage-backed securities			27,324	2.35			31,383	1.51
Collateralized mortgage obligations
	Within 30 days		10,529	0.25			14,109	0.28
Total collateralized mortgage
	obligations		10,529	0.25			14,109	0.28
Total		$	281,529	2.43	%	$	390,921	1.66	%

Schedule of Notes Payable [Table Text Block]

(In thousands)		December 31, 2018		December 31, 2017
Advances with the FHLB with maturities ranging from 2019 through 2029 paying interest at
	monthly fixed rates ranging from 0.95% to 4.19 % (2017 - 0.84% to 4.19%)	$	524,052	$	572,307
Advances with the FHLB maturing on 2019 paying interest monthly
	at a floating rate of 0.34% over the 1 month LIBOR (2017 - 0.22% to 0.34%)		13,000		34,164
Advances with the FHLB maturing on 2019 paying interest quarterly
	at floating rates ranging from 0.12% to 0.24% over the 3 month LIBOR (2017 - 0.09% to 0.24%)		19,724		25,019
Unsecured senior debt securities maturing on 2023 paying interest semiannually at a
	fixed rate of 6.125% (2017 - 7.00%), net of debt issuance costs of $5,961 (2017 - $3,127)		294,039		446,873
Junior subordinated deferrable interest debentures (related to trust preferred securities)
	with maturities ranging from 2033 to 2034 with fixed interest rates ranging from
	6.125% to 6.7%, net of debt issuance costs of $423 (2017 - $449)		384,875		439,351
Capital lease obligations			20,412		18,642
Total notes payable		$	1,256,102	$	1,536,356

Maturity Distribution Of Debt Securities [Text Block]

	Assets sold under			Short-term
(In thousands)	agreements to repurchase			borrowings	Notes payable		Total
2019	$	281,529	$	-	$	211,763	$	493,292
2020		-		-		142,105		142,105
2021		-		-		22,126		22,126
2022		-		-		105,455		105,455
2023		-		-		299,844		299,844
Later years		-		-		474,809		474,809
No stated maturity		-		42		-		42
Total borrowings	$	281,529	$	42	$	1,256,102	$	1,537,673

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]

Assets sold under agreements to repurchase:
(Dollars in thousands)			2018			2017
Maximum aggregate balance outstanding at any month-end		$	401,606		$	471,083
Average monthly aggregate balance outstanding		$	330,585		$	399,422
Weighted average interest rate:
	For the year		2.01	%		1.22	%
	At December 31		2.44	%		1.50	%

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)			2018			2017
Advances with the FHLB (2017 - 1.43% to 1.66%)		$	-		$	95,000
Others			42			1,208
Balance outstanding at the end of the period		$	42		$	96,208
Maximum aggregate balance outstanding at any month-end		$	186,200		$	240,598
Average monthly aggregate balance outstanding		$	27,833		$	52,784
Weighted average interest rate:
	For the year		2.04	%		1.61	%
	At December 31		2.53	%		1.55	%