XML 37 R27.htm IDEA: XBRL DOCUMENT v3.10.0.1

Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Age Analysis of Past Due Loans Segregated by Class of Loans

The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:

	June 30, 2018
(dollars in thousands)	Current				30-59 Days Past Due				60-89 Days Past Due				Non - performing				Total Past Due Loans				Total Loans
Commercial real estate	$	2,781,239			$	2,473			$	312			$	4,617			$	7,402			$	2,788,641
Commercial and industrial	1,450,174				432				119				4,853				5,404				1,455,578
Commercial construction	297,849				68				—				1,870				1,938				299,787
Residential mortgage	689,751				1,445				1,132				6,112				8,689				698,440
Home equity	465,261				1,906				584				3,871				6,361				471,622
Installment and other consumer	66,371				172				46				49				267				66,638
Consumer construction	5,412				—				—				—				—				5,412
Loans held for sale	3,801				—				—				—				—				3,801
Total	$	5,759,858			$	6,496			$	2,193			$	21,372			$	30,061			$	5,789,919

	December 31, 2017
(dollars in thousands)	Current				30-59 Days Past Due				60-89 Days Past Due				Non - performing				Total Past Due Loans				Total Loans
Commercial real estate	$	2,681,395			$	997			$	134			$	3,468			$	4,599			$	2,685,994
Commercial and industrial	1,426,754				420				446				5,646				6,512				1,433,266
Commercial construction	377,968				2,473				20				3,873				6,366				384,334
Residential mortgage	687,195				2,975				1,439				7,165				11,579				698,774
Home equity	480,956				2,065				590				3,715				6,370				487,326
Installment and other consumer	66,770				193				170				71				434				67,204
Consumer construction	4,551				—				—				—				—				4,551
Loans held for sale	4,485				—				—				—				—				4,485
Total	$	5,730,074			$	9,123			$	2,799			$	23,938			$	35,860			$	5,765,934

Schedule of Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	June 30, 2018
(dollars in thousands)	Commercial Real Estate			% of Total			Commercial and Industrial			% of Total			Commercial Construction			% of Total			Total			% of Total
Pass	$	2,636,581		94.5	%		$	1,337,331		91.9	%		$	272,433		90.9	%		$	4,246,345		93.4	%
Special mention	74,169			2.7	%		50,142			3.4	%		8,566			2.8	%		132,877			3.0	%
Substandard	77,891			2.8	%		68,105			4.7	%		18,788			6.3	%		164,784			3.6	%
Total	$	2,788,641		100.0	%		$	1,455,578		100.0	%		$	299,787		100.0	%		$	4,544,006		100.0	%
	December 31, 2017
(dollars in thousands)	Commercial Real Estate			% of Total			Commercial and Industrial			% of Total			Commercial Construction			% of Total			Total			% of Total
Pass	$	2,588,847		96.4	%		$	1,345,810		93.9	%		$	368,105		95.8	%		$	4,302,762		95.5	%
Special mention	66,436			2.5	%		54,320			3.8	%		9,345			2.4	%		130,101			2.9	%
Substandard	30,711			1.1	%		33,136			2.3	%		6,884			1.8	%		70,731			1.6	%
Total	$	2,685,994		100.0	%		$	1,433,266		100.0	%		$	384,334		100.0	%		$	4,503,594		100.0	%

Schedule of Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	June 30, 2018
(dollars in thousands)	Residential Mortgage			% of Total			Home Equity			% of Total			Installment and Other Consumer			% of Total			Consumer Construction			% of Total			Total			% of Total
Performing	$	692,328		99.1	%		$	467,751		99.2	%		$	66,589		99.9	%		$	5,412		100.0	%		$	1,232,080		99.2	%
Nonperforming	6,112			0.9	%		3,871			0.8	%		49			0.1	%		—			—	%		10,032			0.8	%
Total	$	698,440		100.0	%		$	471,622		100.0	%		$	66,638		100.0	%		$	5,412		100.0	%		$	1,242,112		100.0	%
	December 31, 2017
(dollars in thousands)	Residential Mortgage			% of Total			Home Equity			% of Total			Installment and Other Consumer			% of Total			Consumer Construction			% of Total			Total			% of Total
Performing	$	691,609		99.0	%		$	483,611		99.2	%		$	67,133		99.9	%		$	4,551		100.0	%		$	1,246,904		99.1	%
Nonperforming	7,165			1.0	%		3,715			0.8	%		71			0.1	%		—			—	%		10,951			0.9	%
Total	$	698,774		100.0	%		$	487,326		100.0	%		$	67,204		100.0	%		$	4,551		100.0	%		$	1,257,855		100.0	%

Schedule of Investments in Loans Considered to be Impaired and Related Information on Impaired Loans

	Six Months Ended
	June 30, 2018								June 30, 2017
(dollars in thousands)	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—			$	—			$	—			$	—
Commercial and industrial	—				—				628				11
Commercial construction	—				—				—				—
Consumer real estate	—				—				25				1
Other consumer	40				2				27				1
Total with a Related Allowance Recorded	40				2				680				13
Without a related allowance recorded:
Commercial real estate	3,712				85				7,028				70
Commercial and industrial	7,796				218				16,382				124
Commercial construction	3,445				73				4,267				79
Consumer real estate	10,128				253				11,514				255
Other consumer	11				—				12				—
Total without a Related Allowance Recorded	25,092				629				39,203				528
Total:
Commercial real estate	3,712				85				7,028				70
Commercial and industrial	7,796				218				17,010				135
Commercial construction	3,445				73				4,267				79
Consumer real estate	10,128				253				11,539				256
Other consumer	51				2				39				1
Total	$	25,132			$	631			$	39,883			$	541

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:

	Three Months Ended
	June 30, 2018								June 30, 2017
(dollars in thousands)	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—			$	—			$	—			$	—
Commercial and industrial	—				—				813				6
Commercial construction	—				—				—				—
Consumer real estate	—				—				24				1
Other consumer	38				1				26				—
Total with a Related Allowance Recorded	38				1				863				7
Without a related allowance recorded:
Commercial real estate	3,609				54				6,934				35
Commercial and industrial	8,060				210				17,625				95
Commercial construction	3,443				33				4,262				42
Consumer real estate	9,483				118				11,280				125
Other consumer	10				—				11				1
Total without a Related Allowance Recorded	24,605				415				40,112				298
Total:
Commercial real estate	3,609				54				6,934				35
Commercial and industrial	8,060				210				18,438				101
Commercial construction	3,443				33				4,262				42
Consumer real estate	9,483				118				11,304				126
Other consumer	48				1				37				1
Total	$	24,643			$	416			$	40,975			$	305

	Six Months Ended
	June 30, 2018								June 30, 2017
(dollars in thousands)	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—			$	—			$	—			$	—
Commercial and industrial	—				—				628				11
Commercial construction	—				—				—				—
Consumer real estate	—				—				25				1
Other consumer	40				2				27				1
Total with a Related Allowance Recorded	40				2				680				13
Without a related allowance recorded:
Commercial real estate	3,712				85				7,028				70
Commercial and industrial	7,796				218				16,382				124
Commercial construction	3,445				73				4,267				79
Consumer real estate	10,128				253				11,514				255
Other consumer	11				—				12				—
Total without a Related Allowance Recorded	25,092				629				39,203				528
Total:
Commercial real estate	3,712				85				7,028				70
Commercial and industrial	7,796				218				17,010				135
Commercial construction	3,445				73				4,267				79
Consumer real estate	10,128				253				11,539				256
Other consumer	51				2				39				1
Total	$	25,132			$	631			$	39,883			$	541

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:

	June 30, 2018												December 31, 2017
(dollars in thousands)	Recorded Investment				Unpaid Principal Balance				Related Allowance				Recorded Investment				Unpaid Principal Balance				Related Allowance
With a related allowance recorded:
Commercial real estate	$	—			$	—			$	—			$	—			$	—			$	—
Commercial and industrial	—				—				—				1,735				1,787				29
Commercial construction	—				—				—				—				—				—
Consumer real estate	—				—				—				21				21				21
Other consumer	35				35				35				27				27				27
Total with a Related Allowance Recorded	35				35				35				1,783				1,835				77
Without a related allowance recorded:
Commercial real estate	3,555				3,828				—				3,546				3,811				—
Commercial and industrial	17,539				19,281				—				5,549				7,980				—
Commercial construction	3,441				4,950				—				5,464				8,132				—
Consumer real estate	9,186				10,132				—				10,467				11,357				—
Other consumer	9				13				—				14				22				—
Total without a Related Allowance Recorded	33,730				38,204				—				25,040				31,302				—
Total:
Commercial real estate	3,555				3,828				—				3,546				3,811				—
Commercial and industrial	17,539				19,281				—				7,284				9,767				29
Commercial construction	3,441				4,950				—				5,464				8,132				—
Consumer real estate	9,186				10,132				—				10,488				11,378				21
Other consumer	44				48				35				41				49				27
Total	$	33,765			$	38,239			$	35			$	26,823			$	33,137			$	77

Schedule of Summary of Allowance for Loan Losses

The following tables detail activity in the ALLL for the periods presented:

	Three Months Ended June 30, 2018
(dollars in thousands)	Commercial Real Estate				Commercial and Industrial				Commercial Construction				Consumer Real Estate				Other Consumer				Total Loans
Balance at beginning of period	$	30,963			$	10,472			$	10,721			$	5,418			$	1,472			$	59,046
Charge-offs	(237		)		(7,392		)		(321		)		(268		)		(414		)		(8,632		)
Recoveries	185				362				1				85				125				758
Net (Charge-offs)/ Recoveries	(52		)		(7,030		)		(320		)		(183		)		(289		)		(7,874		)
Provision for loan losses	321				7,432				1,275				6				311				9,345
Balance at End of Period	$	31,232			$	10,874			$	11,676			$	5,241			$	1,494			$	60,517
	Three Months Ended June 30, 2017
(dollars in thousands)	Commercial Real Estate				Commercial and Industrial				Commercial Construction				Consumer Real Estate				Other Consumer				Total Loans
Balance at beginning of period	$	20,570			$	13,244			$	14,102			$	5,956			$	1,944			$	55,816
Charge-offs	(1,673		)		(2,682		)		—				(1,097		)		(370		)		(5,822		)
Recoveries	155				69				113				76				75				488
Net (Charge-offs)/ Recoveries	(1,518		)		(2,613		)		113				(1,021		)		(295		)		(5,334		)
Provision for loan losses	5,306				(1,375		)		(271		)		868				341				4,869
Balance at End of Period	$	24,358			$	9,256			$	13,944			$	5,803			$	1,990			$	55,351
	Six Months Ended June 30, 2018
(dollars in thousands)	Commercial Real Estate				Commercial and Industrial				Commercial Construction				Consumer Real Estate				Other Consumer				Total Loans
Balance at beginning of period	$	27,235			$	8,966			$	13,167			$	5,479			$	1,543			$	56,390
Charge-offs	(232		)		(8,222		)		(321		)		(429		)		(872		)		(10,076		)
Recoveries	228				480				1,130				323				225				2,386
Net (Charge-offs)/Recoveries	(4		)		(7,742		)		809				(106		)		(647		)		(7,690		)
Provision for loan losses	4,001				9,650				(2,300		)		(132		)		598				11,817
Balance at End of Period	$	31,232			$	10,874			$	11,676			$	5,241			$	1,494			$	60,517
	Six Months Ended June 30, 2017
(dollars in thousands)	Commercial Real Estate				Commercial and Industrial				Commercial Construction				Consumer Real Estate				Other Consumer				Total Loans
Balance at beginning of period	$	19,976			$	10,810			$	13,999			$	6,095			$	1,895			$	52,775
Charge-offs	(2,063		)		(3,396		)		(644		)		(1,856		)		(804		)		(8,763		)
Recoveries	233				255				369				179				251				1,287
Net (Charge-offs)/Recoveries	(1,830		)		(3,141		)		(275		)		(1,677		)		(553		)		(7,476		)
Provision for loan losses	6,212				1,587				220				1,385				648				10,052
Balance at End of Period	$	24,358			$	9,256			$	13,944			$	5,803			$	1,990			$	55,351

Schedule of Summary of Allowance for Loan Losses and Recorded Investments

The following tables present the ALLL and recorded investments in loans by category as of the periods presented:

	June 30, 2018
	Allowance for Loan Losses												Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total				Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total
Commercial real estate	$	—			$	31,232			$	31,232			$	3,555			$	2,785,086			$	2,788,641
Commercial and industrial	—				10,874				10,874				17,539				1,438,039				1,455,578
Commercial construction	—				11,676				11,676				3,441				296,346				299,787
Consumer real estate	—				5,241				5,241				9,186				1,166,288				1,175,474
Other consumer	35				1,459				1,494				44				66,594				66,638
Total	$	35			$	60,482			$	60,517			$	33,765			$	5,752,353			$	5,786,118
	December 31, 2017
	Allowance for Loan Losses												Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total				Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total
Commercial real estate	$	—			$	27,235			$	27,235			$	3,546			$	2,682,448			$	2,685,994
Commercial and industrial	29				8,937				8,966				7,284				1,425,982				1,433,266
Commercial construction	—				13,167				13,167				5,464				378,870				384,334
Consumer real estate	21				5,458				5,479				10,488				1,180,163				1,190,651
Other consumer	27				1,516				1,543				41				67,163				67,204
Total	$	77			$	56,313			$	56,390			$	26,823			$	5,734,626			$	5,761,449

X

- Definition

Allowance for loan losses and portfolio loans.

+ References

No definition available.

+ Details

Name:	stba_AllowanceForLoanLossesAndPortfolioLoansTableTableTextBlock
Namespace Prefix:	stba_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of change in fair value of commercial consumer loans.

+ References

No definition available.

+ Details

Name:	stba_ScheduleOfChangeInFairValueOfCommercialConsumerLoansTableTableTextBlock
Namespace Prefix:	stba_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of performing non performing loans by category.

+ References

No definition available.

+ Details

Name:	stba_ScheduleOfPerformingNonPerformingLoansByCategoryTableTableTextBlock
Namespace Prefix:	stba_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953659-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 55
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=82894031&loc=SL6953803-111525

+ Details

Name:	us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of impaired financing receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivablesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_PastDueFinancingReceivablesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration