Allowance for credit losses (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Changes in Allowance for Credit Losses

Changes in the allowance for credit losses for the years ended December 31, 2018, 2017 and 2016 were as follows:

	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated			Total
	(In thousands)
2018
Beginning balance	$	328,599			374,085			65,405			170,809			78,300		$	1,017,198
Provision for credit losses		33,967			(41,181	)		12,401			127,068			(255	)		132,000
Net charge-offs
Charge-offs		(60,414	)		(12,286	)		(15,345	)		(143,196	)		—			(231,241	)
Recoveries		27,903			21,037			6,664			45,883			—			101,487
Net (charge-offs) recoveries		(32,511	)		8,751			(8,681	)		(97,313	)		—			(129,754	)
Ending balance	$	330,055			341,655			69,125			200,564			78,045		$	1,019,444
2017
Beginning balance	$	330,833			362,719			61,127			156,288			78,030		$	988,997
Provision for credit losses		41,511			6,715			16,094			103,410			270			168,000
Net charge-offs
Charge-offs		(64,941	)		(7,931	)		(20,799	)		(130,927	)		—			(224,598	)
Recoveries		21,196			12,582			8,983			42,038			—			84,799
Net (charge-offs) recoveries		(43,745	)		4,651			(11,816	)		(88,889	)		—			(139,799	)
Ending balance	$	328,599			374,085			65,405			170,809			78,300		$	1,017,198
2016
Beginning balance	$	300,404			326,831			72,238			178,320			78,199		$	955,992
Provision for credit losses		59,506			33,627			6,902			90,134			(169	)		190,000
Net charge-offs
Charge-offs		(59,244	)		(4,805	)		(26,133	)		(141,073	)		—			(231,255	)
Recoveries		30,167			7,066			8,120			28,907			—			74,260
Net (charge-offs) recoveries		(29,077	)		2,261			(18,013	)		(112,166	)		—			(156,995	)
Ending balance	$	330,833			362,719			61,127			156,288			78,030		$	988,997

Impaired Loans and Leases

The following tables provide information with respect to loans and leases that were considered impaired as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016.

	December 31, 2018						December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
	(In thousands)
With an allowance recorded:
Commercial, financial, leasing, etc.	$	153,478		175,549		46,034		177,250		194,257		45,488
Real estate:
Commercial		110,253		125,117		11,937		67,199		75,084		9,140
Residential builder and developer		5,981		6,557		462		5,320		5,641		308
Other commercial construction		10,563		11,113		640		4,817		20,357		647
Residential		124,974		147,817		5,402		101,724		122,602		4,000
Residential — limited documentation		74,156		90,066		3,000		77,277		92,439		3,900
Consumer:
Home equity lines and loans		47,982		53,248		9,135		48,847		53,914		8,812
Recreational finance		6,138		9,163		1,261		1,496		3,680		299
Automobile		3,527		3,599		729		13,498		15,737		2,811
Other		5,203		8,380		1,046		1,724		2,192		357
		542,255		630,609		79,646		499,152		585,903		75,762
With no related allowance recorded:
Commercial, financial, leasing, etc.		105,507		136,128		—		89,126		115,327		—
Real estate:
Commercial		113,376		124,657		—		138,356		149,716		—
Residential builder and developer		2,593		2,602		—		5,057		5,296		—
Other commercial construction		11,710		11,880		—		5,456		9,130		—
Residential		15,379		20,496		—		13,574		18,980		—
Residential — limited documentation		5,631		9,796		—		9,588		16,138		—
		254,196		305,559		—		261,157		314,587		—
Total:
Commercial, financial, leasing, etc.		258,985		311,677		46,034		266,376		309,584		45,488
Real estate:
Commercial		223,629		249,774		11,937		205,555		224,800		9,140
Residential builder and developer		8,574		9,159		462		10,377		10,937		308
Other commercial construction		22,273		22,993		640		10,273		29,487		647
Residential		140,353		168,313		5,402		115,298		141,582		4,000
Residential — limited documentation		79,787		99,862		3,000		86,865		108,577		3,900
Consumer:
Home equity lines and loans		47,982		53,248		9,135		48,847		53,914		8,812
Recreational finance		6,138		9,163		1,261		1,496		3,680		299
Automobile		3,527		3,599		729		13,498		15,737		2,811
Other		5,203		8,380		1,046		1,724		2,192		357
Total	$	796,451		936,168		79,646		760,309		900,490		75,762

Interest Income Recognized on Impaired Loans

	Year Ended December 31, 2018						Year Ended December 31, 2017
			Interest Income Recognized						Interest Income Recognized
	Average Recorded Investment		Total		Cash Basis		Average Recorded Investment		Total		Cash Basis
	(In thousands)
Commercial, financial, leasing, etc.	$	263,018		7,873		7,873		240,157		3,894		3,894
Real estate:
Commercial		194,451		10,880		10,880		207,616		4,497		4,497
Residential builder and developer		8,699		1,779		1,779		16,209		6,419		6,419
Other commercial construction		11,467		3,474		3,474		15,142		1,001		1,001
Residential		129,593		8,386		3,456		110,646		7,177		3,406
Residential — limited documentation		82,854		6,118		1,723		93,097		5,981		1,607
Consumer:
Home equity lines and loans		48,591		1,698		289		47,323		1,681		400
Recreational finance		1,849		333		9		1,041		212		9
Automobile		9,262		690		69		15,045		1,025		81
Other		4,413		230		13		2,322		96		2
Total	$	754,197		41,461		29,565		748,598		31,983		21,316

	Year Ended December 31, 2016
			Interest Income Recognized
	Average Recorded Investment		Total		Cash Basis
	(In thousands)
Commercial, financial, leasing, etc.	$	277,647		8,342		8,342
Real estate:
Commercial		175,877		4,878		4,878
Residential builder and developer		29,237		2,300		2,300
Other commercial construction		19,697		644		644
Residential		98,394		6,227		3,154
Residential — limited documentation		103,060		5,999		1,975
Consumer:
Home equity lines and loans		36,493		1,325		410
Recreational finance		2,549		147		49
Automobile		19,636		1,242		99
Other		6,669		293		34
Total	$	769,259		31,397		21,885

Summary of Loan Grades

The following table summarizes the loan grades applied to the various classes of the Company’s commercial loans and commercial real estate loans.

			Real Estate
	Commercial,				Residential		Other
	Financial,				Builder and		Commercial
	Leasing, etc.		Commercial		Developer		Construction
	(In thousands)
December 31, 2018
Pass	$	21,693,705		24,539,706		1,546,002		6,890,562
Criticized accrual		1,049,848		866,987		139,509		150,115
Criticized nonaccrual		234,423		203,672		4,798		22,205
Total	$	22,977,976		25,610,365		1,690,309		7,062,882
December 31, 2017
Pass	$	20,490,486		24,380,184		1,485,148		6,270,812
Criticized accrual		1,011,174		723,777		140,119		164,812
Criticized nonaccrual		240,991		184,982		6,451		10,088
Total	$	21,742,651		25,288,943		1,631,718		6,445,712

Allocation of Allowance for Credit Losses on Basis of Company's Impairment Methodology

The allocation of the allowance for credit losses summarized on the basis of the Company’s impairment methodology was as follows:

	Commercial, Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)
December 31, 2018
Individually evaluated for impairment	$	46,034		13,039		8,402		12,171	$	79,646
Collectively evaluated for impairment		284,021		328,616		48,326		188,393		849,356
Purchased impaired		—		—		12,397		—		12,397
Allocated	$	330,055		341,655		69,125		200,564	$	941,399
Unallocated										78,045
Total									$	1,019,444
December 31, 2017
Individually evaluated for impairment	$	45,488		10,095		7,900		12,279	$	75,762
Collectively evaluated for impairment		283,111		363,990		47,645		158,530		853,276
Purchased impaired		—		—		9,860		—		9,860
Allocated	$	328,599		374,085		65,405		170,809		938,898
Unallocated										78,300
Total									$	1,017,198

Recorded Investment in Loans and Leases on Basis of Company's Impairment Methodology

The recorded investment in loans and leases summarized on the basis of the Company’s impairment methodology was as follows:

	Commercial, Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)
December 31, 2018
Individually evaluated for impairment	$	258,985		254,476		220,140		62,850	$	796,451
Collectively evaluated  for impairment		22,718,991		34,098,670		16,641,411		13,907,649		87,366,721
Purchased impaired		—		10,410		292,895		—		303,305
Total	$	22,977,976		34,363,556		17,154,446		13,970,499	$	88,466,477
December 31, 2017
Individually evaluated for impairment	$	266,376		226,205		202,163		65,565	$	760,309
Collectively evaluated for impairment		21,476,254		33,117,512		19,023,843		13,201,050		86,818,659
Purchased impaired		21		22,656		387,338		—		410,015
Total	$	21,742,651		33,366,373		19,613,344		13,266,615	$	87,988,983