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Loans and the Allowance for Credit Losses (Details) - Aging analysis - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | $ 60,940 | $ 61,696
Total Past Due and Nonaccrual | 95,187 | 98,000
Gross Loans | 6,295,508 | 6,247,681
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 31,105 | 33,019
Total Past Due and Nonaccrual | 36,873 | 38,204
Gross Loans | 1,622,652 | 1,521,967
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 16,101 | 10,111
Total Past Due and Nonaccrual | 35,736 | 33,064
Gross Loans | 3,797,244 | 3,783,550
Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 8,951 | 14,015
Total Past Due and Nonaccrual | 13,351 | 16,487
Gross Loans | 565,872 | 617,747
Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 4,783 | 4,551
Total Past Due and Nonaccrual | 9,223 | 10,243
Gross Loans | 306,376 | 322,564
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual | 4 | 2
Gross Loans | 3,364 | 1,853
Current [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 6,200,321 | 6,149,681
Current [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1,585,779 | 1,483,763
Current [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 3,761,508 | 3,750,486
Current [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 552,521 | 601,260
Current [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 297,153 | 312,321
Current [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 3,360 | 1,851
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 17,191 | 18,544
30 - 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1,293 | 1,445
30 - 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 11,292 | 13,258
30 - 59 Days Past Due [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4,400 | 2,472
30 - 59 Days Past Due [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 202 | 1,367
30 - 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4 | 2
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 664 | 4,939
60 - 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 558
60 - 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 664 | 4,140
60 - 89 Days Past Due [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
60 - 89 Days Past Due [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 241
60 - 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 16,392 | 12,821
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4,475 | 3,182
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 7,679 | 5,555
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
90 Days or Greater Past Due and Still Accruing [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4,238 | 4,084
90 Days or Greater Past Due and Still Accruing [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |

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