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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands | Mar. 31, 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 | $ 15,800 | $ 15,200
Individually evaluated loans, allowance for credit losses | 3,900 | 3,200
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 16,551 | 27,806
Nonaccrual | 43,399 | 44,647
Current | 7,573,509 | 7,426,432
Recorded total loans | 7,633,459 | 7,498,885
Loans in non-accrual without an allowance for credit losses | 0 | 0
31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 10,687 | 18,472
61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,709 | 6,185
Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,155 | 3,149
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 3,126 | 5,804
Nonaccrual | 24,506 | 24,249
Current | 4,112,816 | 3,938,658
Recorded total loans | 4,140,448 | 3,968,711
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,359 | 2,917
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 693 | 2,394
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 74 | 493
Commercial Loans [Member] | C&I [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,387 | 4,652
Nonaccrual | 4,994 | 4,278
Current | 1,145,359 | 1,116,686
Recorded total loans | 1,152,740 | 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 | 1,985 | 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 | 402 | 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 | 0 | 23
Commercial Loans [Member] | CRE [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 739 | 1,152
Nonaccrual | 19,512 | 19,971
Current | 2,430,963 | 2,391,162
Recorded total loans | 2,451,214 | 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 | 374 | 682
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 291 | 0
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 74 | 470
Commercial Loans [Member] | PPP [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 | 0
Nonaccrual | 0 | 0
Current | 536,494 | 430,810
Recorded total loans | 536,494 | 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 | 0
Commercial Loans [Member] | PPP [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 0 | 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 | 0
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 11,521 | 18,456
Nonaccrual | 2,075 | 3,020
Current | 1,498,719 | 1,518,783
Recorded total loans | 1,512,315 | 1,540,259
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 7,232 | 12,836
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 2,677 | 3,482
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,612 | 2,138
Consumer Loans [Member] | Auto [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 5,715 | 11,544
Nonaccrual | 1,789 | 2,730
Current | 865,474 | 877,831
Recorded total loans | 872,978 | 892,105
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 4,365 | 9,125
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 847 | 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 | 503 | 866
Consumer Loans [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 5,806 | 6,912
Nonaccrual | 286 | 290
Current | 633,245 | 640,952
Recorded total loans | 639,337 | 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 | 2,867 | 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 | 1,830 | 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 | 1,109 | 1,272
Residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,904 | 3,546
Nonaccrual | 16,818 | 17,378
Current | 1,961,974 | 1,968,991
Recorded total loans | 1,980,696 | 1,989,915
Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 1,096 | 2,719
Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | 339 | 309
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total past due accruing | $ 469 | $ 518

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