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Loans and the Allowance for Loan Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment | $ 11,349 |  | $ 1,267 |  |  |
ALLL, Collectively evaluated for impairment | 59,880 |  | 35,685 |  |  |
ALLL, Acquired portfolio | 2,492 |  | 1,242 |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated | 546 |  | 99 |  |  |
Total | 74,267 | $ 68,724 | 38,293 | $ 38,771 | $ 37,698 | $ 34,954
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment | 78,526 |  | 66,986 |  |  |
Loans Receivable, Collectively evaluated for impairment | 5,113,045 |  | 4,539,568 |  |  |
Loans Receivable, Acquired portfolio | 1,058,169 |  | 505,187 |  |  |
Loans Receivables, Acquired with deteriorated credit quality | 13,520 |  | 6,553 |  |  |
Total | 6,263,260 |  | 5,118,294 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment | 10,000 |  |  |  |  |
ALLL, Collectively evaluated for impairment | 14,158 |  | 8,309 |  |  |
ALLL, Acquired portfolio |  |  | 40 |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated |  |  |  |  |  |
Total | 24,158 | 9,345 | 8,349 | 8,325 | 8,721 | 9,875
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment | 35,209 |  | 37,984 |  |  |
Loans Receivable, Collectively evaluated for impairment | 1,509,236 |  | 1,011,708 |  |  |
Loans Receivable, Acquired portfolio | 83,121 |  | 74,517 |  |  |
Loans Receivables, Acquired with deteriorated credit quality | 3,868 |  | 5,452 |  |  |
Total | 1,631,434 |  | 1,129,661 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment | 1,000 |  |  |  |  |
ALLL, Collectively evaluated for impairment | 37,519 |  | 19,967 |  |  |
ALLL, Acquired portfolio | 1,559 |  | 886 |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated |  |  |  |  |  |
Total | 40,078 | 22,655 | 20,853 | 21,010 | 21,485 | 18,847
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment | 15,122 |  | 15,249 |  |  |
Loans Receivable, Collectively evaluated for impairment | 2,790,162 |  | 2,669,999 |  |  |
Loans Receivable, Acquired portfolio | 861,653 |  | 355,610 |  |  |
Loans Receivables, Acquired with deteriorated credit quality | 5,525 |  | 1,101 |  |  |
Total | 3,672,462 |  | 3,041,959 |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment | 302 |  | 1,244 |  |  |
ALLL, Collectively evaluated for impairment | 6,389 |  | 5,744 |  |  |
ALLL, Acquired portfolio | 291 |  | 316 |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated |  |  |  |  |  |
Total | 6,982 | 8,026 | 7,304 | 7,175 | 5,542 | 4,519
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment | 23,953 |  | 12,179 |  |  |
Loans Receivable, Collectively evaluated for impairment | 559,665 |  | 578,620 |  |  |
Loans Receivable, Acquired portfolio | 30,494 |  | 32,527 |  |  |
Loans Receivables, Acquired with deteriorated credit quality |  |  |  |  |  |
Total | 614,112 |  | 623,326 |  |  |
Residential Real Estate Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment | 47 |  | 23 |  |  |
ALLL, Collectively evaluated for impairment | 1,811 |  | 1,662 |  |  |
ALLL, Acquired portfolio | 642 |  |  |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated |  |  |  |  |  |
Total | 2,500 | 1,690 | 1,685 | 1,761 | 1,208 | 1,266
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment | 4,242 |  | 1,574 |  |  |
Loans Receivable, Collectively evaluated for impairment | 252,418 |  | 276,177 |  |  |
Loans Receivable, Acquired portfolio | 82,589 |  | 42,269 |  |  |
Loans Receivables, Acquired with deteriorated credit quality | 4,127 |  |  |  |  |
Total | 343,376 |  | 320,020 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, Individually evaluated for impairment |  |  |  |  |  |
ALLL, Collectively evaluated for impairment | 3 |  | 3 |  |  |
ALLL, Acquired portfolio |  |  |  |  |  |
ALLL, Acquired with deteriorated credit quality |  |  |  |  |  |
Unallocated |  |  |  |  |  |
Total | 3 | 5 | 3 | 4 | 2 | 2
Gross loans |  |  |  |  |  |
Loans Receivable, Individually evaluated for impairment |  |  |  |  |  |
Loans Receivable, Collectively evaluated for impairment | 1,564 |  | 3,064 |  |  |
Loans Receivable, Acquired portfolio | 312 |  | 264 |  |  |
Loans Receivables, Acquired with deteriorated credit quality |  |  |  |  |  |
Total | 1,876 |  | 3,328 |  |  |
Unallocated [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
Unallocated | 546 |  | 99 |  |  |
Total | $ 546 | $ 27,003 | $ 99 | $ 496 | $ 740 | $ 445

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