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Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Credit Quality by Loan Class [Abstract] |  |
Net loans | $ 7,013,809 | $ 6,887,709
Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,245,688 | 2,284,563
Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,416,920 | 1,380,836
Originated Loans [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 6,724,120 | 6,565,118
Originated Loans [Member] | Commercial Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,683,684 | 2,589,349
Originated Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,533,792 | 2,478,108
Originated Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 72,360 | 25,242
Originated Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 77,532 | 85,999
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 837,827 | 848,119
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 771,776 | 796,778
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 32,992 | 11,348
Originated Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 33,059 | 39,993
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,845,857 | 1,741,230
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,762,016 | 1,681,330
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 39,368 | 13,894
Originated Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 44,473 | 46,006
Originated Loans [Member] | Business Banking Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 534,706 | 489,271
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 520,830 | 476,052
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 13,876 | 13,219
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 534,706 | 489,271
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 520,830 | 476,052
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 13,876 | 13,219
Originated Loans [Member] | Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,220,267 | 2,252,939
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,212,603 | 2,245,076
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 7,664 | 7,863
Originated Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,195,783 | 1,216,112
Originated Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,192,448 | 1,212,955
Originated Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 3,335 | 3,157
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 528,505 | 524,928
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 526,937 | 523,366
Originated Loans [Member] | Consumer Credit Exposure [Member] | Specialty Lending [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,568 | 1,562
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 495,979 | 511,899
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 493,218 | 508,755
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,761 | 3,144
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,285,463 | 1,233,559
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,278,652 | 1,225,599
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 6,811 | 7,960
Originated Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,285,463 | 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 | 1,278,652 | 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 | 6,811 | 7,960
Acquired Loans [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 289,689 | 322,591
Acquired Loans [Member] | Commercial Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 96,676 | 110,616
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 89,222 | 107,045
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,860 | 2,923
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 4,594 | 648
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 28,823 | 26,124
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 21,781 | 23,283
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Special Mention [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,860 | 2,831
Acquired Loans [Member] | Commercial Credit Exposure [Member] | C&I [Member] | Substandard [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 4,182 | 10
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 67,853 | 84,492
Acquired Loans [Member] | Commercial Credit Exposure [Member] | CRE [Member] | Pass [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 67,441 | 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 | 412 | 638
Acquired Loans [Member] | Business Banking Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 36,135 | 33,074
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 33,499 | 29,945
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,636 | 3,129
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 36,135 | 33,074
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 33,499 | 29,945
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 2,636 | 3,129
Acquired Loans [Member] | Consumer Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 25,421 | 31,624
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 25,290 | 31,382
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 131 | 242
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans |  | 32
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans |  | 32
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Dealer Finance [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 | 25,421 | 31,592
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 25,290 | 31,350
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 131 | 242
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 131,457 | 147,277
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Performing [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 130,287 | 145,779
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Nonperforming [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 1,170 | 1,498
Acquired Loans [Member] | Residential Real Estate Credit Exposure [Member] | Residential Real Estate [Member] |  |
Credit Quality by Loan Class [Abstract] |  |
Net loans | 131,457 | 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 | 130,287 | 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 | $ 1,170 | $ 1,498

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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=118952595&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=118936363&loc=d3e5074-111524 + Details
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