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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Relationship | Dec. 31, 2019 USD ($) Relationship
Allowance for Credit Losses and Credit Quality of Loans [Abstract] |  |
Individually evaluated loans, number of relationships | Relationship | 5 | 0
Individually evaluated loans, amortized cost | $ 15,200 |
Individually evaluated loans, allowance for credit losses | 3,200 |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 27,806 | $ 34,803
Nonaccrual | 44,647 | 25,174
Current | 7,426,432 | 7,076,121
Recorded total loans | 7,498,885 | 7,136,098
Loans in non-accrual without an allowance for credit losses | $ 0 |
Minimum number of days past due for loans to be considered nonperforming | 90 days |
31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | $ 18,472 | 25,610
61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 6,185 | 5,476
Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,149 | 3,717
Indirect Auto [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Recorded total loans | 931,286 | 1,193,635
Specialty Lending [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Recorded total loans | 579,644 | 542,063
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 5,804 |
Nonaccrual | 24,249 |
Current | 3,938,658 |
Recorded total loans | 3,968,711 |
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,917 |
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,394 |
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 493 |
Commercial Loans [Member] | C&I [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 4,652 |
Nonaccrual | 4,278 |
Current | 1,116,686 |
Recorded total loans | 1,125,616 |
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,235 |
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,394 |
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 23 |
Commercial Loans [Member] | CRE [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,152 |
Nonaccrual | 19,971 |
Current | 2,391,162 |
Recorded total loans | 2,412,285 |
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 682 |
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 |
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 470 |
Commercial Loans [Member] | PPP [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 |
Nonaccrual | 0 |
Current | 430,810 |
Recorded total loans | 430,810 |
Commercial Loans [Member] | PPP [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 |
Commercial Loans [Member] | PPP [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 |
Commercial Loans [Member] | PPP [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 |
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 18,456 |
Nonaccrual | 3,020 |
Current | 1,518,783 |
Recorded total loans | 1,540,259 |
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 12,836 |
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,482 |
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,138 |
Consumer Loans [Member] | Auto [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 11,544 |
Nonaccrual | 2,730 |
Current | 877,831 |
Recorded total loans | 892,105 |
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 9,125 |
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,553 |
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 866 |
Consumer Loans [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 6,912 |
Nonaccrual | 290 |
Current | 640,952 |
Recorded total loans | 648,154 |
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,711 |
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,929 |
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,272 |
Residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,546 |
Nonaccrual | 17,378 |
Current | 1,968,991 |
Recorded total loans | 1,989,915 |
Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,719 |
Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 309 |
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | $ 518 |
Originated Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 32,917
Nonaccrual |  | 23,581
Current |  | 6,814,722
Recorded total loans |  | 6,871,220
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 24,353
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 5,111
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 3,453
Originated Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 5,759
Nonaccrual |  | 13,059
Current |  | 3,310,182
Recorded total loans |  | 3,329,000
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 5,597
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 162
Originated Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,227
Nonaccrual |  | 1,177
Current |  | 838,502
Recorded total loans |  | 840,906
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,227
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 3,576
Nonaccrual |  | 4,847
Current |  | 1,941,143
Recorded total loans |  | 1,949,566
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 3,576
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 956
Nonaccrual |  | 7,035
Current |  | 530,537
Recorded total loans |  | 538,528
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 794
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 162
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Originated Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 25,126
Nonaccrual |  | 4,650
Current |  | 2,193,167
Recorded total loans |  | 2,222,943
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 17,577
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 4,759
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 2,790
Originated Loans [Member] | Consumer Loans [Member] | Indirect Auto [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 14,973
Nonaccrual |  | 2,175
Current |  | 1,176,487
Recorded total loans |  | 1,193,635
Originated Loans [Member] | Consumer Loans [Member] | Indirect Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 11,860
Originated Loans [Member] | Consumer Loans [Member] | Indirect Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 2,108
Originated Loans [Member] | Consumer Loans [Member] | Indirect Auto [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,005
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 6,547
Nonaccrual |  | 0
Current |  | 535,516
Recorded total loans |  | 542,063
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 3,153
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 2,087
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,307
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 3,606
Nonaccrual |  | 2,475
Current |  | 481,164
Recorded total loans |  | 487,245
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 2,564
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 564
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 478
Originated Loans [Member] | Residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 2,032
Nonaccrual |  | 5,872
Current |  | 1,311,373
Recorded total loans |  | 1,319,277
Originated Loans [Member] | Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,179
Originated Loans [Member] | Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 190
Originated Loans [Member] | Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 663
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,886
Nonaccrual |  | 1,593
Current |  | 261,399
Recorded total loans |  | 264,878
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 1,257
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 365
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 264
Acquired Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 833
Nonaccrual |  | 382
Current |  | 114,051
Recorded total loans |  | 115,266
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 546
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 287
Acquired Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 149
Nonaccrual |  | 0
Current |  | 19,215
Recorded total loans |  | 19,364
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 149
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Nonaccrual |  | 0
Current |  | 60,937
Recorded total loans |  | 60,937
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 684
Nonaccrual |  | 382
Current |  | 33,899
Recorded total loans |  | 34,965
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 397
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 287
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 194
Nonaccrual |  | 105
Current |  | 23,434
Recorded total loans |  | 23,733
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 136
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 58
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 194
Nonaccrual |  | 105
Current |  | 23,434
Recorded total loans |  | 23,733
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 136
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 58
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 0
Acquired Loans [Member] | Residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 859
Nonaccrual |  | 1,106
Current |  | 123,914
Recorded total loans |  | 125,879
Acquired Loans [Member] | Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 575
Acquired Loans [Member] | Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | 20
Acquired Loans [Member] | Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing |  | $ 264

X
- Definition The number of relationships of financing receivables that were individually evaluated for impairment. + References No definition available. + Details
Name: | nbtb_FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships
Namespace Prefix: | nbtb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of valuation allowance for loans and leases receivables that are expected to be uncollectible that were individually evaluated for impairment. + References No definition available. + Details
Name: | nbtb_LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment
Namespace Prefix: | nbtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of loans and leases receivables that were individually evaluated for impairment. + References No definition available. + Details
Name: | nbtb_LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | nbtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The threshold period past due for a loan to be considered nonperforming, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of financing receivable on nonaccrual status with no allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
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- Definition Amount of financing receivable not past due. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 + Details
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- Definition Amount of financing receivable 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 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
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- Definition Amount of financing receivable past due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 Reference 3: 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=121611835&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 + Details
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