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Loans and the Allowance for Loan Losses (Details) - Allowance for loan losses - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | $ 14,314 | $ 1,267 |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 59,072 | 35,784 |  |
Allowance for loan and lease losses, acquired portfolio | 5,840 | 1,242 |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 79,226 | 38,293 | $ 34,954 | $ 31,748
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 80,550 | 66,986 |  |
Loans Receivable, collectively evaluated for impairment | 5,192,274 | 4,539,568 |  |
Loans Receivable, acquired portfolio | 961,340 | 505,187 |  |
Loans Receivables, acquired with deteriorated credit quality | 13,517 | 6,553 |  |
Loans Receivable, Total | 6,247,681 | 5,118,294 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 12,985 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 15,412 | 8,309 |  |
Allowance for loan and lease losses, acquired portfolio | 46 | 40 |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 28,443 | 8,349 | 9,875 | 8,233
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 35,061 | 37,984 |  |
Loans Receivable, collectively evaluated for impairment | 1,414,626 | 1,011,708 |  |
Loans Receivable, acquired portfolio | 68,402 | 74,517 |  |
Loans Receivables, acquired with deteriorated credit quality | 3,878 | 5,452 |  |
Loans Receivable, Total | 1,521,967 | 1,129,661 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 1,329 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 33,373 | 19,967 |  |
Allowance for loan and lease losses, acquired portfolio | 4,628 | 886 |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 39,330 | 20,853 | 18,847 | 17,112
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 15,827 | 15,249 |  |
Loans Receivable, collectively evaluated for impairment | 2,959,978 | 2,669,999 |  |
Loans Receivable, acquired portfolio | 802,190 | 355,610 |  |
Loans Receivables, acquired with deteriorated credit quality | 5,555 | 1,101 |  |
Loans Receivable, Total | 3,783,550 | 3,041,959 |  |
Commercial construction [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  | 1,244 |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 7,787 | 5,744 |  |
Allowance for loan and lease losses, acquired portfolio | 407 | 316 |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 8,194 | 7,304 | 4,519 | 4,747
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 24,284 | 12,179 |  |
Loans Receivable, collectively evaluated for impairment | 574,118 | 578,620 |  |
Loans Receivable, acquired portfolio | 19,345 | 32,527 |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |
Loans Receivable, Total | 617,747 | 623,326 |  |
Residential Portfolio Segment [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  | 23 |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 1,928 | 1,662 |  |
Allowance for loan and lease losses, acquired portfolio | 759 |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 2,687 | 1,685 | 1,266 | 1,050
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 5,378 | 1,574 |  |
Loans Receivable, collectively evaluated for impairment | 241,925 | 276,177 |  |
Loans Receivable, acquired portfolio | 71,177 | 42,269 |  |
Loans Receivables, acquired with deteriorated credit quality | 4,084 |  |  |
Loans Receivable, Total | 322,564 | 320,020 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 4 | 3 |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | 4 | 3 | 2 | 1
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment |  |  |  |
Loans Receivable, collectively evaluated for impairment | 1,627 | 3,064 |  |
Loans Receivable, acquired portfolio | 226 | 264 |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |
Loans Receivable, Total | 1,853 | 3,328 |  |
Unallocated Financing Receivables [Member] |  |  |  |
Allowance for loan and lease losses |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 568 | 99 |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan and lease losses, total | $ 568 | $ 99 | $ 445 | $ 605

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