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Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 $ 1,268,757    
2019 1,240,238    
2018 915,402    
2017 612,707    
2016 654,916    
2015 and Prior 1,657,854    
Revolving 1,018,345    
Revolving-Term 26,649    
Total 7,394,868   $ 7,137,152
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 1,265,090    
2019 1,239,531    
2018 912,836    
2017 609,018    
2016 637,681    
2015 and Prior 1,604,946    
Revolving 1,016,118    
Revolving-Term 25,576    
Total 7,310,796    
Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 3,667    
2019 707    
2018 2,566    
2017 3,689    
2016 17,235    
2015 and Prior 52,908    
Revolving 2,227    
Revolving-Term 1,073    
Total 84,072    
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 5,810,034   5,512,796
Commercial | Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 277,760    
2019 462,569    
2018 454,551    
2017 326,132    
2016 425,755    
2015 and Prior 821,346    
Revolving 50,114    
Revolving-Term 0    
Total 2,818,227 $ 3,416,518 3,059,592
Commercial | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 686,461    
2019 234,748    
2018 156,217    
2017 94,327    
2016 47,706    
2015 and Prior 218,559    
Revolving 380,631    
Revolving-Term 0    
Total 1,818,649 1,720,833 1,480,529
Commercial | Consumer construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 102,950    
2019 227,000    
2018 83,556    
2017 17,596    
2016 9,854    
2015 and Prior 18,686    
Revolving 11,218    
Revolving-Term 0    
Total 470,860 375,445 370,060
Commercial | Business banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 97,471    
2019 164,039    
2018 137,941    
2017 99,360    
2016 86,333    
2015 and Prior 323,499    
Revolving 106,166    
Revolving-Term 1,142    
Total 1,015,951 0 846,790
Commercial | Performing | Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 277,760    
2019 462,569    
2018 454,551    
2017 326,132    
2016 411,947    
2015 and Prior 788,059    
Revolving 50,114    
Revolving-Term 0    
Total 2,771,132    
Commercial | Performing | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 683,514    
2019 234,748    
2018 155,958    
2017 94,327    
2016 47,706    
2015 and Prior 217,628    
Revolving 379,082    
Revolving-Term 0    
Total 1,812,963    
Commercial | Performing | Consumer construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 102,950    
2019 227,000    
2018 83,556    
2017 16,555    
2016 9,854    
2015 and Prior 18,223    
Revolving 11,218    
Revolving-Term 0    
Total 469,356    
Commercial | Performing | Business banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 97,471    
2019 163,734    
2018 136,249    
2017 98,042    
2016 84,263    
2015 and Prior 311,076    
Revolving 105,951    
Revolving-Term 1,084    
Total 997,870    
Commercial | Nonperforming | Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 13,808    
2015 and Prior 33,287    
Revolving 0    
Revolving-Term 0    
Total 47,095    
Commercial | Nonperforming | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 2,947    
2019 0    
2018 259    
2017 0    
2016 0    
2015 and Prior 931    
Revolving 1,549    
Revolving-Term 0    
Total 5,686    
Commercial | Nonperforming | Consumer construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 1,041    
2016 0    
2015 and Prior 463    
Revolving 0    
Revolving-Term 0    
Total 1,504    
Commercial | Nonperforming | Business banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 305    
2018 1,692    
2017 1,318    
2016 2,070    
2015 and Prior 12,423    
Revolving 215    
Revolving-Term 58    
Total 18,081    
Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,584,834   1,624,356
Consumer | Consumer construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 15,343   8,390
Consumer | Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 95,412    
2019 136,323    
2018 75,055    
2017 70,907    
2016 81,618    
2015 and Prior 271,042    
Revolving 436,604    
Revolving-Term 23,519    
Total 1,190,480 1,545,323 1,295,207
Consumer | Other consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 8,703    
2019 15,559    
2018 8,082    
2017 4,385    
2016 3,650    
2015 and Prior 4,722    
Revolving 33,612    
Revolving-Term 1,988    
Total 80,701 $ 79,033 $ 84,974
Consumer | Performing | Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 94,828    
2019 136,323    
2018 74,440    
2017 69,663    
2016 80,532    
2015 and Prior 265,917    
Revolving 436,328    
Revolving-Term 22,639    
Total 1,180,670    
Consumer | Performing | Other consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 8,567    
2019 15,157    
2018 8,082    
2017 4,299    
2016 3,379    
2015 and Prior 4,043    
Revolving 33,425    
Revolving-Term 1,853    
Total 78,805    
Consumer | Nonperforming | Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 584    
2019 0    
2018 615    
2017 1,244    
2016 1,086    
2015 and Prior 5,125    
Revolving 276    
Revolving-Term 880    
Total 9,810    
Consumer | Nonperforming | Other consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 136    
2019 402    
2018 0    
2017 86    
2016 271    
2015 and Prior 679    
Revolving 187    
Revolving-Term 135    
Total $ 1,896