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Loans and the Allowance for Credit Losses (Details) - Credit Quality Indicators - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | $ 6,587,896 | $ 6,247,681
Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 6,379,338 | 6,047,888
Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 67,524 | 79,868
Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 141,034 | 119,710
Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  | 215
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans | [1] | 1,325,488 | 1,521,967
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 1,257,861 | 1,447,097
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 24,767 | 30,725
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 42,860 | 43,930
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  | 215
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 4,436,626 | 3,783,550
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 4,323,007 | 3,700,498
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 42,757 | 49,143
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 70,862 | 33,909
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 552,896 | 617,747
Commercial Construction Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 538,008 | 587,266
Commercial Construction Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Commercial Construction Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 14,888 | 30,481
Commercial Construction Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Residential Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 270,793 | 322,564
Residential Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 258,369 | 311,174
Residential Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Residential Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 12,424 | 11,390
Residential Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 2,093 | 1,853
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  | 2,093 | 1,853
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Gross loans |  |  |
[1] | Included in commercial loans as of September 30, 2021 and December 31, 2020 were PPP loans of $177.8 million and $397.5 million, respectively.

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