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Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Credit Quality by Loan Class [Abstract] |  |
Net Loans | $ 7,136,098 | $ 6,887,709
Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,246,676 | 2,284,563
Consumer Credit Exposure [Member] | Indirect Auto [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,193,635 | 1,216,144
Consumer Credit Exposure [Member] | Specialty Lending [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 542,063 | 524,928
Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,445,156 | 1,380,836
Originated Loans [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 6,871,220 | 6,565,118
Originated Loans [Member] | Commercial Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,790,472 | 2,589,349
Originated Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,651,441 | 2,478,108
Originated Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 58,899 | 25,242
Originated Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 79,626 | 85,999
Originated Loans [Member] | Commercial Credit Exposure [Member] | Doubtful [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 506 |
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 840,906 | 848,119
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 782,763 | 796,778
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 28,380 | 11,348
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 29,257 | 39,993
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Doubtful [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 506 |
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,949,566 | 1,741,230
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,868,678 | 1,681,330
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 30,519 | 13,894
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 50,369 | 46,006
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Doubtful [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 0 |
Originated Loans [Member] | Business Banking Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 538,528 | 489,271
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 524,725 | 476,052
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 13,803 | 13,219
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 538,528 | 489,271
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 524,725 | 476,052
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 13,803 | 13,219
Originated Loans [Member] | Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,222,943 | 2,252,939
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,215,503 | 2,245,076
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 7,440 | 7,863
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,193,635 | 1,216,112
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,190,455 | 1,212,955
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 3,180 | 3,157
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 542,063 | 524,928
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 540,756 | 523,366
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,307 | 1,562
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 487,245 | 511,899
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 484,292 | 508,755
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,953 | 3,144
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,319,277 | 1,233,559
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,312,742 | 1,225,599
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 6,535 | 7,960
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,319,277 | 1,233,559
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,312,742 | 1,225,599
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 6,535 | 7,960
Acquired Loans [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 264,878 | 322,591
Acquired Loans [Member] | Commercial Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 80,301 | 110,616
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 78,346 | 107,045
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,269 | 2,923
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 686 | 648
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 19,364 | 26,124
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 17,801 | 23,283
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,269 | 2,831
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 294 | 10
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 60,937 | 84,492
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 60,545 | 83,762
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 0 | 92
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 392 | 638
Acquired Loans [Member] | Business Banking Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 34,965 | 33,074
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 32,030 | 29,945
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,935 | 3,129
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 34,965 | 33,074
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 32,030 | 29,945
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 2,935 | 3,129
Acquired Loans [Member] | Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 23,733 | 31,624
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 23,628 | 31,382
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 105 | 242
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans |  | 32
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans |  | 32
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect Auto [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans |  | 0
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 23,733 | 31,592
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 23,628 | 31,350
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 105 | 242
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 125,879 | 147,277
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 124,509 | 145,779
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 1,370 | 1,498
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 125,879 | 147,277
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | 124,509 | 145,779
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net Loans | $ 1,370 | $ 1,498

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