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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands | Jun. 30, 2021 USD ($) Relationship | Dec. 31, 2020 USD ($) Relationship
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Allowance for Credit Losses and Credit Quality of Loans [Abstract] |  |
Individually evaluated loans, number of relationships | Relationship | 5 | 5
Individually evaluated loans, amortized cost | $ 15,000 | $ 15,200
Individually evaluated loans, allowance for credit losses | 3,400 | 3,200
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 40,550 | 44,647
Recorded total loans | 7,517,627 | 7,498,885
Loans in non-accrual without an allowance for credit losses | 0 | 0
Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 19,517 | 27,806
31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 11,845 | 18,472
61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,097 | 6,185
Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,575 | 3,149
Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 7,457,560 | 7,426,432
C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,144,930 | 1,125,616
CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,498,951 | 2,412,285
PPP [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 359,738 | 430,810
Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 863,107 | 892,105
Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 662,700 | 648,154
Commercial Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 23,867 | 24,249
Recorded total loans | 4,003,619 | 3,968,711
Commercial Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,489 | 5,804
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 292 | 2,917
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,701 | 2,394
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,496 | 493
Commercial Loans [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,976,263 | 3,938,658
Commercial Loans [Member] | C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 4,908 | 4,278
Recorded total loans | 1,144,930 | 1,125,616
Commercial Loans [Member] | C&I [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,818 | 4,652
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 292 | 2,235
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 30 | 2,394
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,496 | 23
Commercial Loans [Member] | C&I [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,138,204 | 1,116,686
Commercial Loans [Member] | CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 18,959 | 19,971
Recorded total loans | 2,498,951 | 2,412,285
Commercial Loans [Member] | CRE [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,671 | 1,152
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 682
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,671 | 0
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 470
Commercial Loans [Member] | CRE [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,478,321 | 2,391,162
Commercial Loans [Member] | PPP [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 0 | 0
Recorded total loans | 359,738 | 430,810
Commercial Loans [Member] | PPP [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 0
Commercial Loans [Member] | PPP [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 0
Commercial Loans [Member] | PPP [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 0
Commercial Loans [Member] | PPP [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 0
Commercial Loans [Member] | PPP [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 359,738 | 430,810
Consumer Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 1,441 | 3,020
Recorded total loans | 1,525,807 | 1,540,259
Consumer Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 12,695 | 18,456
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 9,257 | 12,836
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,466 | 3,482
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 972 | 2,138
Consumer Loans [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,511,671 | 1,518,783
Consumer Loans [Member] | Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 1,273 | 2,730
Recorded total loans | 863,107 | 892,105
Consumer Loans [Member] | Auto [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 7,328 | 11,544
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 6,233 | 9,125
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 878 | 1,553
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 217 | 866
Consumer Loans [Member] | Auto [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 854,506 | 877,831
Consumer Loans [Member] | Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 168 | 290
Recorded total loans | 662,700 | 648,154
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,367 | 6,912
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,024 | 3,711
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,588 | 1,929
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 755 | 1,272
Consumer Loans [Member] | Other Consumer [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 657,165 | 640,952
Residential [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 15,242 | 17,378
Recorded total loans | 1,988,201 | 1,989,915
Residential [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,333 | 3,546
Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,296 | 2,719
Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 930 | 309
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 107 | 518
Residential [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | $ 1,969,626 | $ 1,968,991

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