XML 70 R43.htm IDEA: XBRL DOCUMENT
v3.22.2

Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | $ 637,499 | $ 1,380,130
Year two | 1,267,784 | 772,783
Year three | 668,401 | 961,071
Year four | 843,038 | 606,970
Year five | 520,135 | 431,724
More than five years | 1,714,822 | 1,591,979
Revolving | 1,361,657 | 1,226,925
Revolving-Term | 27,558 | 28,408
Total | 7,040,894 | 6,999,990
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 637,460 | 1,379,856
Year two | 1,264,318 | 768,961
Year three | 661,700 | 879,574
Year four | 777,803 | 576,166
Year five | 485,850 | 370,013
More than five years | 1,473,625 | 1,361,826
Revolving | 1,334,907 | 1,209,363
Revolving-Term | 23,901 | 24,964
Total | 6,659,564 | 6,570,723
Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 150
Year two | 134 | 151
Year three | 250 | 42,832
Year four | 34,448 | 10,312
Year five | 12,548 | 41,574
More than five years | 127,631 | 88,094
Revolving | 7,900 | 9,047
Revolving-Term | 110 | 111
Total | 183,021 | 192,271
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 39 | 124
Year two | 3,332 | 3,671
Year three | 6,451 | 36,888
Year four | 30,787 | 20,492
Year five | 21,737 | 20,137
More than five years | 113,556 | 142,059
Revolving | 18,850 | 8,515
Revolving-Term | 3,547 | 3,333
Total | 198,299 | 235,219
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 1,777
Year four | 0 | 0
Year five | 0 | 0
More than five years | 10 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 10 | 1,777
Commercial Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 5,297,126 | 5,406,584
Commercial Loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 179,496 | 385,347
Year two | 362,454 | 317,359
Year three | 297,630 | 468,720
Year four | 454,398 | 334,743
Year five | 307,989 | 266,019
More than five years | 1,001,528 | 881,391
Revolving | 22,509 | 36,948
Revolving-Term | 0 | 0
Total | 2,626,004 | 2,690,528
Commercial Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 100,561 | 437,529
Year two | 340,495 | 126,371
Year three | 101,459 | 134,417
Year four | 99,768 | 86,912
Year five | 74,144 | 41,422
More than five years | 147,689 | 136,470
Revolving | 615,470 | 550,402
Revolving-Term | 0 | 0
Total | 1,479,586 | 1,513,523
Commercial Loans | Commercial construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 56,592 | 142,321
Year two | 153,742 | 110,562
Year three | 65,974 | 113,532
Year four | 78,247 | 16,838
Year five | 4,660 | 989
More than five years | 9,529 | 10,477
Revolving | 26,591 | 30,036
Revolving-Term | 0 | 0
Total | 395,335 | 424,755
Commercial Loans | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 142,538 | 257,409
Year two | 249,086 | 108,048
Year three | 99,139 | 144,976
Year four | 127,057 | 115,228
Year five | 97,886 | 81,889
More than five years | 335,210 | 318,735
Revolving | 108,632 | 108,230
Revolving-Term | 1,242 | 1,179
Total | 1,160,790 | 1,135,693
Commercial Loans | Pass | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 179,496 | 385,347
Year two | 359,214 | 316,003
Year three | 296,299 | 412,191
Year four | 432,058 | 314,303
Year five | 284,614 | 213,019
More than five years | 804,236 | 698,992
Revolving | 22,509 | 35,448
Revolving-Term | 0 | 0
Total | 2,378,426 | 2,375,303
Commercial Loans | Pass | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 100,561 | 437,483
Year two | 340,453 | 126,371
Year three | 101,459 | 115,359
Year four | 81,813 | 83,030
Year five | 70,673 | 37,176
More than five years | 145,354 | 132,182
Revolving | 589,993 | 536,554
Revolving-Term | 0 | 0
Total | 1,430,306 | 1,468,155
Commercial Loans | Pass | Commercial construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 56,592 | 142,321
Year two | 153,742 | 108,405
Year three | 63,832 | 111,512
Year four | 58,690 | 16,838
Year five | 4,656 | 989
More than five years | 3,222 | 3,539
Revolving | 26,591 | 30,036
Revolving-Term | 0 | 0
Total | 367,325 | 413,640
Commercial Loans | Pass | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 142,538 | 257,264
Year two | 248,994 | 107,791
Year three | 96,053 | 141,411
Year four | 121,959 | 110,586
Year five | 91,817 | 79,187
More than five years | 311,935 | 293,215
Revolving | 108,301 | 107,093
Revolving-Term | 538 | 443
Total | 1,122,135 | 1,096,990
Commercial Loans | Special mention | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 37,786
Year four | 8,569 | 6,401
Year five | 7,391 | 40,445
More than five years | 116,973 | 75,938
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 132,933 | 160,570
Commercial Loans | Special mention | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 46
Year two | 42 | 0
Year three | 0 | 3,060
Year four | 3,898 | 2,546
Year five | 2,185 | 72
More than five years | 215 | 832
Revolving | 7,721 | 8,887
Revolving-Term | 0 | 0
Total | 14,061 | 15,443
Commercial Loans | Special mention | Commercial construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 19,077 | 0
Year five | 0 | 0
More than five years | 4,389 | 4,458
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 23,466 | 4,458
Commercial Loans | Special mention | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 104
Year two | 92 | 151
Year three | 250 | 1,986
Year four | 2,904 | 1,365
Year five | 2,972 | 1,057
More than five years | 5,144 | 5,929
Revolving | 179 | 160
Revolving-Term | 110 | 111
Total | 11,651 | 10,863
Commercial Loans | Substandard | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 3,240 | 1,356
Year three | 1,331 | 18,743
Year four | 13,771 | 14,039
Year five | 15,984 | 12,555
More than five years | 80,309 | 106,461
Revolving | 0 | 1,500
Revolving-Term | 0 | 0
Total | 114,635 | 154,654
Commercial Loans | Substandard | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 14,221
Year four | 14,057 | 1,336
Year five | 1,286 | 4,174
More than five years | 2,120 | 3,456
Revolving | 17,756 | 4,961
Revolving-Term | 0 | 0
Total | 35,219 | 28,148
Commercial Loans | Substandard | Commercial construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 2,157
Year three | 2,142 | 2,020
Year four | 480 | 0
Year five | 4 | 0
More than five years | 1,918 | 2,480
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 4,544 | 6,657
Commercial Loans | Substandard | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 41
Year two | 0 | 106
Year three | 2,836 | 1,579
Year four | 2,194 | 3,277
Year five | 3,097 | 1,645
More than five years | 18,131 | 19,591
Revolving | 152 | 977
Revolving-Term | 594 | 625
Total | 27,004 | 27,841
Commercial Loans | Doubtful | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 10 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 10 | 0
Commercial Loans | Doubtful | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 1,777
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 1,777
Commercial Loans | Doubtful | Commercial construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 0
Commercial Loans | Doubtful | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 0
Consumer Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,743,768 | 1,593,406
Consumer Loans | Business banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 357,900
Consumer Loans | Consumer real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 146,070 | 137,465
Year two | 148,208 | 100,995
Year three | 96,994 | 92,165
Year four | 78,620 | 50,156
Year five | 33,556 | 40,384
More than five years | 219,814 | 238,462
Revolving | 511,173 | 443,406
Revolving-Term | 24,817 | 24,552
Total | 1,259,252 | 1,127,585
Consumer Loans | Other Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 12,242 | 20,059
Year two | 13,799 | 9,448
Year three | 7,205 | 7,261
Year four | 4,948 | 3,093
Year five | 1,900 | 1,021
More than five years | 1,052 | 6,444
Revolving | 77,282 | 57,903
Revolving-Term | 1,499 | 2,677
Total | 119,927 | 107,906
Consumer Loans | Pass | Consumer real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 146,031 | 137,465
Year two | 148,128 | 100,995
Year three | 96,856 | 91,981
Year four | 78,335 | 48,531
Year five | 32,192 | 39,029
More than five years | 207,827 | 231,861
Revolving | 510,231 | 442,530
Revolving-Term | 21,874 | 23,391
Total | 1,241,474 | 1,115,783
Consumer Loans | Pass | Other Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 12,242 | 19,976
Year two | 13,787 | 9,396
Year three | 7,201 | 7,120
Year four | 4,948 | 2,878
Year five | 1,898 | 613
More than five years | 1,051 | 2,037
Revolving | 77,282 | 57,702
Revolving-Term | 1,489 | 1,130
Total | 119,898 | 100,852
Consumer Loans | Special mention | Consumer real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 910 | 937
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 910 | 937
Consumer Loans | Special mention | Other Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 0
Consumer Loans | Substandard | Consumer real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 39 | 0
Year two | 80 | 0
Year three | 138 | 184
Year four | 285 | 1,625
Year five | 1,364 | 1,355
More than five years | 11,077 | 5,664
Revolving | 942 | 876
Revolving-Term | 2,943 | 1,161
Total | 16,868 | 10,865
Consumer Loans | Substandard | Other Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 83
Year two | 12 | 52
Year three | 4 | 141
Year four | 0 | 215
Year five | 2 | 408
More than five years | 1 | 4,407
Revolving | 0 | 201
Revolving-Term | 10 | 1,547
Total | 29 | 7,054
Consumer Loans | Doubtful | Consumer real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 0
Consumer Loans | Doubtful | Other Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | $ 0 | $ 0

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6A -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120270059-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_BusinessBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_ConsumerRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_OtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |