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Loans and the Allowance for Credit Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  | $ 15,895 |  | $ 14,314 |  |  |
ACL, Collectively evaluated for impairment |  | 56,721 |  | 59,072 |  |  |
ACL, Acquired portfolio |  |  |  | 5,840 |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  | 5,370 |  |  |  |  |
Total |  | 77,986 | $ 78,684 | 79,226 | $ 74,267 | $ 68,724 | $ 38,293
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  | 103,211 |  | 80,550 |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 6,469,284 |  | 5,192,274 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 961,340 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  | 15,401 |  | 13,517 |  |  |
Total |  | 6,587,896 |  | 6,247,681 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  | 14,630 |  | 12,985 |  |  |
ACL, Collectively evaluated for impairment |  | 9,487 |  | 15,412 |  |  |
ACL, Acquired portfolio |  |  |  | 46 |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  | 3,219 |  |  |  |  |
Total |  | 27,336 | 25,567 | 28,443 | 24,158 | 9,345 | 8,349
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  | 33,970 |  | 35,061 |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 1,286,337 |  | 1,414,626 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 68,402 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  | 5,181 |  | 3,878 |  |  |
Total | [1] | 1,325,488 |  | 1,521,967 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  | 1,199 |  | 1,329 |  |  |
ACL, Collectively evaluated for impairment |  | 40,222 |  | 33,373 |  |  |
ACL, Acquired portfolio |  |  |  | 4,628 |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  | 1,921 |  |  |  |  |
Total |  | 43,342 | 43,815 | 39,330 | 40,078 | 22,655 | 20,853
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  | 50,642 |  | 15,827 |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 4,380,004 |  | 2,959,978 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 802,190 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  | 5,980 |  | 5,555 |  |  |
Total |  | 4,436,626 |  | 3,783,550 |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  |  |  |  |  |  |
ACL, Collectively evaluated for impairment |  | 3,702 |  | 7,787 |  |  |
ACL, Acquired portfolio |  |  |  | 407 |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  |  |  |  |  |  |
Total |  | 3,702 | 4,927 | 8,194 | 6,982 | 8,026 | 7,304
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  | 12,582 |  | 24,284 |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 540,314 |  | 574,118 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 19,345 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  |  |  |  |  |  |
Total |  | 552,896 |  | 617,747 |  |  |
Residential Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  | 66 |  |  |  |  |
ACL, Collectively evaluated for impairment |  | 3,302 |  | 1,928 |  |  |
ACL, Acquired portfolio |  |  |  | 759 |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  | 230 |  |  |  |  |
Total |  | 3,598 | 4,366 | 2,687 | 2,500 | 1,690 | 1,685
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  | 6,017 |  | 5,378 |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 260,536 |  | 241,925 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 71,177 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  | 4,240 |  | 4,084 |  |  |
Total |  | 270,793 |  | 322,564 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  |  |  |  |  |  |
ACL, Collectively evaluated for impairment |  | 8 |  | 4 |  |  |
ACL, Acquired portfolio |  |  |  |  |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  |  |  |  |  |  |
Total |  | 8 | 9 | 4 | 3 | 5 | 3
Gross loans |  |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  |  |  |  |  |  |
Loans Receivable, Collectively evaluated for impairment |  | 2,093 |  | 1,627 |  |  |
Loans Receivable, Acquired portfolio |  |  |  | 226 |  |  |
Loans Receivables, Acquired with deteriorated credit quality individually analyzed |  |  |  |  |  |  |
Total |  | 2,093 |  | 1,853 |  |  |
Unallocated [Member] |  |  |  |  |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items] |  |  |  |  |  |  |
ACL, Individually evaluated for impairment |  |  |  |  |  |  |
ACL, Collectively evaluated for impairment |  |  |  | 568 |  |  |
ACL, Acquired portfolio |  |  |  |  |  |  |
ACL, Acquired with deteriorated credit quality individually analyzed |  |  |  |  |  |  |
Total |  |  |  | $ 568 | $ 546 | $ 27,003 | $ 99
[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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