XML 94 R81.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Total Loan Balance |  |
Current fiscal year | $ 1,117,436 | $ 1,271,764
Year two | 1,320,936 | 1,214,107
Year three | 1,094,225 | 586,544
Year four | 503,703 | 725,517
Year five | 645,502 | 449,759
More than five years | 1,650,211 | 1,528,088
Revolving | 1,292,135 | 1,381,517
Revolving-Term | 29,193 | 26,673
Total | 7,653,341 | 7,183,969
Current Year-to-date Gross Charge-offs |  |
2023 | 830 |
2022 | 214 |
2021 | 218 |
2020 | 25 |
2019 | 3,989 |
2018 and Prior | 18,669 |
Revolving | 109 |
Revolving-Term | 584 |
Total | 24,638 | 11,617
Pass |  |
Total Loan Balance |  |
Current fiscal year | 1,117,247 | 1,271,177
Year two | 1,318,412 | 1,177,280
Year three | 1,060,514 | 581,879
Year four | 499,034 | 677,616
Year five | 595,848 | 406,053
More than five years | 1,473,853 | 1,313,942
Revolving | 1,253,528 | 1,348,200
Revolving-Term | 25,838 | 23,596
Total | 7,344,274 | 6,799,743
Special mention |  |
Total Loan Balance |  |
Current fiscal year | 189 | 0
Year two | 1,681 | 36,547
Year three | 16,493 | 146
Year four | 224 | 26,394
Year five | 24,920 | 24,765
More than five years | 87,973 | 113,071
Revolving | 4,163 | 20,073
Revolving-Term | 172 | 95
Total | 135,815 | 221,091
Substandard |  |
Total Loan Balance |  |
Current fiscal year | 0 | 587
Year two | 843 | 280
Year three | 17,218 | 4,519
Year four | 4,445 | 21,507
Year five | 24,734 | 18,941
More than five years | 88,385 | 101,043
Revolving | 34,444 | 13,244
Revolving-Term | 3,183 | 2,982
Total | 173,252 | 163,103
Doubtful |  |
Total Loan Balance |  |
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 | 32
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 32
Commercial Loans | Commercial real estate |  |
Total Loan Balance |  |
Current fiscal year | 276,677 | 292,732
Year two | 324,469 | 360,423
Year three | 439,308 | 269,049
Year four | 240,256 | 449,493
Year five | 419,371 | 261,941
More than five years | 926,636 | 883,535
Revolving | 32,418 | 21,666
Revolving-Term | 0 | 0
Total | 2,659,135 | 2,538,839
Current Year-to-date Gross Charge-offs |  |
2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 and Prior | 1,706 |
Revolving | 0 |
Revolving-Term | 0 |
Total | 1,706 | 827
Commercial Loans | Commercial and industrial |  |
Total Loan Balance |  |
Current fiscal year | 171,861 | 253,696
Year two | 231,978 | 289,448
Year three | 210,636 | 88,544
Year four | 54,696 | 73,998
Year five | 52,858 | 65,911
More than five years | 193,905 | 147,273
Revolving | 520,249 | 591,522
Revolving-Term | 0 | 0
Total | 1,436,183 | 1,510,392
Current Year-to-date Gross Charge-offs |  |
2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 3,412 |
2018 and Prior | 15,842 |
Revolving | 0 |
Revolving-Term | 0 |
Total | 19,254 | 5,797
Commercial Loans | Commercial construction |  |
Total Loan Balance |  |
Current fiscal year | 75,596 | 120,655
Year two | 154,456 | 170,691
Year three | 82,313 | 40,762
Year four | 14,845 | 14,442
Year five | 4,727 | 3,953
More than five years | 4,438 | 4,176
Revolving | 14,208 | 27,284
Revolving-Term | 0 | 0
Total | 350,583 | 381,963
Current Year-to-date Gross Charge-offs |  |
2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 451 |
2018 and Prior | 0 |
Revolving | 0 |
Revolving-Term | 0 |
Total | 451 | 0
Commercial Loans | Business banking |  |
Total Loan Balance |  |
Current fiscal year | 270,129 | 287,679
Year two | 262,606 | 233,723
Year three | 207,611 | 91,149
Year four | 88,018 | 109,731
Year five | 99,574 | 84,889
More than five years | 334,766 | 292,211
Revolving | 96,754 | 105,271
Revolving-Term | 1,307 | 1,291
Total | 1,360,765 | 1,205,944
Current Year-to-date Gross Charge-offs |  |
2023 | 0 |
2022 | 67 |
2021 | 43 |
2020 | 1 |
2019 | 88 |
2018 and Prior | 1,073 |
Revolving | 34 |
Revolving-Term | 0 |
Total | 1,306 | 3,314
Commercial Loans | Pass | Commercial real estate |  |
Total Loan Balance |  |
Current fiscal year | 276,677 | 292,732
Year two | 323,463 | 360,423
Year three | 433,308 | 267,743
Year four | 237,901 | 422,872
Year five | 383,799 | 227,006
More than five years | 781,465 | 704,600
Revolving | 32,418 | 21,666
Revolving-Term | 0 | 0
Total | 2,469,031 | 2,297,042
Commercial Loans | Pass | Commercial and industrial |  |
Total Loan Balance |  |
Current fiscal year | 171,672 | 253,324
Year two | 231,114 | 264,012
Year three | 185,884 | 88,544
Year four | 53,101 | 63,190
Year five | 47,063 | 62,874
More than five years | 183,165 | 138,250
Revolving | 482,490 | 559,777
Revolving-Term | 0 | 0
Total | 1,354,489 | 1,429,971
Commercial Loans | Pass | Commercial construction |  |
Total Loan Balance |  |
Current fiscal year | 75,596 | 120,655
Year two | 154,456 | 159,737
Year three | 82,313 | 40,762
Year four | 14,845 | 6,338
Year five | 151 | 3,953
More than five years | 4,054 | 2,297
Revolving | 14,208 | 27,284
Revolving-Term | 0 | 0
Total | 345,623 | 361,026
Commercial Loans | Pass | Business banking |  |
Total Loan Balance |  |
Current fiscal year | 270,129 | 287,520
Year two | 262,535 | 233,499
Year three | 204,874 | 87,926
Year four | 87,346 | 107,819
Year five | 96,371 | 80,549
More than five years | 321,360 | 276,843
Revolving | 96,618 | 104,354
Revolving-Term | 523 | 645
Total | 1,339,756 | 1,179,155
Commercial Loans | Special mention | Commercial real estate |  |
Total Loan Balance |  |
Current fiscal year | 0 | 0
Year two | 1,006 | 0
Year three | 6,000 | 0
Year four | 0 | 13,187
Year five | 24,887 | 20,090
More than five years | 75,428 | 101,112
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 107,321 | 134,389
Commercial Loans | Special mention | Commercial and industrial |  |
Total Loan Balance |  |
Current fiscal year | 189 | 0
Year two | 620 | 25,436
Year three | 10,242 | 0
Year four | 0 | 5,103
Year five | 0 | 1,885
More than five years | 8,848 | 7,132
Revolving | 4,126 | 19,280
Revolving-Term | 0 | 0
Total | 24,025 | 58,836
Commercial Loans | Special mention | Commercial construction |  |
Total Loan Balance |  |
Current fiscal year | 0 | 0
Year two | 0 | 10,954
Year three | 0 | 0
Year four | 0 | 8,104
Year five | 0 | 0
More than five years | 0 | 0
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 19,058
Commercial Loans | Special mention | Business banking |  |
Total Loan Balance |  |
Current fiscal year | 0 | 0
Year two | 55 | 157
Year three | 251 | 146
Year four | 224 | 0
Year five | 33 | 2,790
More than five years | 3,508 | 3,945
Revolving | 37 | 793
Revolving-Term | 172 | 95
Total | 4,280 | 7,926
Commercial Loans | Substandard | Commercial real estate |  |
Total Loan Balance |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 1,306
Year four | 2,355 | 13,434
Year five | 10,685 | 14,845
More than five years | 69,743 | 77,823
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 82,783 | 107,408
Commercial Loans | Substandard | Commercial and industrial |  |
Total Loan Balance |  |
Current fiscal year | 0 | 372
Year two | 244 | 0
Year three | 14,510 | 0
Year four | 1,595 | 5,705
Year five | 5,795 | 1,152
More than five years | 1,892 | 1,891
Revolving | 33,633 | 12,465
Revolving-Term | 0 | 0
Total | 57,669 | 21,585
Commercial Loans | Substandard | Commercial construction |  |
Total Loan Balance |  |
Current fiscal year | 0 | 0
Year two | 0 | 0
Year three | 0 | 0
Year four | 0 | 0
Year five | 4,576 | 0
More than five years | 384 | 1,879
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 4,960 | 1,879
Commercial Loans | Substandard | Business banking |  |
Total Loan Balance |  |
Current fiscal year | 0 | 159
Year two | 16 | 67
Year three | 2,486 | 3,077
Year four | 448 | 1,912
Year five | 3,170 | 1,550
More than five years | 9,898 | 11,391
Revolving | 99 | 124
Revolving-Term | 612 | 551
Total | 16,729 | 18,831
Commercial Loans | Doubtful | Commercial real estate |  |
Total Loan Balance |  |
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 | Commercial and industrial |  |
Total Loan Balance |  |
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 | Commercial construction |  |
Total Loan Balance |  |
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 |  |
Total Loan Balance |  |
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 | 32
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 0 | 32
Consumer Loans | Consumer real estate |  |
Total Loan Balance |  |
Current fiscal year | 311,887 | 296,948
Year two | 335,462 | 149,003
Year three | 147,850 | 91,613
Year four | 102,041 | 74,583
Year five | 67,890 | 32,031
More than five years | 189,794 | 200,169
Revolving | 552,080 | 553,649
Revolving-Term | 24,774 | 23,957
Total | 1,731,778 | 1,421,953
Current Year-to-date Gross Charge-offs |  |
2023 | 0 |
2022 | 1 |
2021 | 0 |
2020 | 5 |
2019 | 1 |
2018 and Prior | 43 |
Revolving | 75 |
Revolving-Term | 296 |
Total | 421 | 304
Consumer Loans | Other consumer |  |
Total Loan Balance |  |
Current fiscal year | 11,286 | 20,054
Year two | 11,965 | 10,819
Year three | 6,507 | 5,427
Year four | 3,847 | 3,270
Year five | 1,082 | 1,034
More than five years | 672 | 724
Revolving | 76,426 | 82,125
Revolving-Term | 3,112 | 1,425
Total | 114,897 | 124,878
Current Year-to-date Gross Charge-offs |  |
2023 | 830 |
2022 | 146 |
2021 | 175 |
2020 | 19 |
2019 | 37 |
2018 and Prior | 5 |
Revolving | 0 |
Revolving-Term | 288 |
Total | 1,500 | 1,375
Consumer Loans | Pass | Consumer real estate |  |
Total Loan Balance |  |
Current fiscal year | 311,887 | 296,900
Year two | 334,879 | 148,790
Year three | 147,652 | 91,477
Year four | 101,999 | 74,155
Year five | 67,402 | 30,658
More than five years | 183,283 | 191,228
Revolving | 551,368 | 552,994
Revolving-Term | 22,206 | 21,547
Total | 1,720,676 | 1,407,749
Consumer Loans | Pass | Other consumer |  |
Total Loan Balance |  |
Current fiscal year | 11,286 | 20,046
Year two | 11,965 | 10,819
Year three | 6,483 | 5,427
Year four | 3,842 | 3,242
Year five | 1,062 | 1,013
More than five years | 526 | 724
Revolving | 76,426 | 82,125
Revolving-Term | 3,109 | 1,404
Total | 114,699 | 124,800
Consumer Loans | Special mention | Consumer real estate |  |
Total Loan Balance |  |
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 | 189 | 882
Revolving | 0 | 0
Revolving-Term | 0 | 0
Total | 189 | 882
Consumer Loans | Special mention | Other consumer |  |
Total Loan Balance |  |
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 |  |
Total Loan Balance |  |
Current fiscal year | 0 | 48
Year two | 583 | 213
Year three | 198 | 136
Year four | 42 | 428
Year five | 488 | 1,373
More than five years | 6,322 | 8,059
Revolving | 712 | 655
Revolving-Term | 2,568 | 2,410
Total | 10,913 | 13,322
Consumer Loans | Substandard | Other consumer |  |
Total Loan Balance |  |
Current fiscal year | 0 | 8
Year two | 0 | 0
Year three | 24 | 0
Year four | 5 | 28
Year five | 20 | 21
More than five years | 146 | 0
Revolving | 0 | 0
Revolving-Term | 3 | 21
Total | 198 | 78
Consumer Loans | Doubtful | Consumer real estate |  |
Total Loan Balance |  |
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 |  |
Total Loan Balance |  |
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 Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + 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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6A + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: |