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Loans and the Allowance for Loan Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment | $ 110 |  | $ 145 |  |  |
ALLL, collectively evaluated for impairment | 28,260 |  | 25,599 |  |  |
ALLL, acquired portfolio | 1,500 |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 29,870 | $ 28,401 | 25,744 | $ 37,615 | $ 32,763 | $ 26,572
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 30,835 |  | 30,991 |  |  |
Loans Receivable, collectively evaluated for impairment | 3,356,822 |  | 2,783,922 |  |  |
Loans Receivable, acquired portfolio | 499,295 |  | 656,448 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 5,475 |  | 8,080 |  |  |
Total gross loans | 3,892,427 |  | 3,479,441 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment |  |  |  |  |  |
ALLL, collectively evaluated for impairment | 7,716 |  | 6,632 |  |  |
ALLL, acquired portfolio |  |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 7,716 | 7,238 | 6,632 | 20,396 | 15,548 | 10,949
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 3,068 |  | 3,637 |  |  |
Loans Receivable, collectively evaluated for impairment | 618,012 |  | 517,869 |  |  |
Loans Receivable, acquired portfolio | 15,290 |  | 24,972 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 5,243 |  | 7,098 |  |  |
Total gross loans | 641,613 |  | 553,576 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment | 110 |  | 145 |  |  |
ALLL, collectively evaluated for impairment | 15,224 |  | 12,438 |  |  |
ALLL, acquired portfolio | 1,500 |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 16,834 | 15,389 | 12,583 | 11,375 | 11,371 | 10,926
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 20,861 |  | 19,532 |  |  |
Loans Receivable, collectively evaluated for impairment | 2,142,385 |  | 1,621,745 |  |  |
Loans Receivable, acquired portfolio | 421,727 |  | 562,451 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 232 |  | 982 |  |  |
Total gross loans | 2,585,205 |  | 2,204,710 |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment |  |  |  |  |  |
ALLL, collectively evaluated for impairment | 3,940 |  | 4,789 |  |  |
ALLL, acquired portfolio |  |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 3,940 | 4,241 | 4,789 | 4,072 | 4,040 | 3,253
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 4,340 |  | 5,909 |  |  |
Loans Receivable, collectively evaluated for impairment | 395,113 |  | 478,865 |  |  |
Loans Receivable, acquired portfolio |  |  | 1,454 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Total gross loans | 399,453 |  | 486,228 |  |  |
Residential Real Estate Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment |  |  |  |  |  |
ALLL, collectively evaluated for impairment | 1,052 |  | 958 |  |  |
ALLL, acquired portfolio |  |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 1,052 | 985 | 958 | 1,174 | 1,091 | 976
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 2,520 |  | 1,851 |  |  |
Loans Receivable, collectively evaluated for impairment | 199,902 |  | 163,686 |  |  |
Loans Receivable, acquired portfolio | 61,822 |  | 67,010 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Total gross loans | 264,244 |  | 232,547 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment |  |  |  |  |  |
ALLL, collectively evaluated for impairment | 2 |  | 3 |  |  |
ALLL, acquired portfolio |  |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | 2 | 2 | 3 | 4 | 4 | 4
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 46 |  | 62 |  |  |
Loans Receivable, collectively evaluated for impairment | 1,410 |  | 1,757 |  |  |
Loans Receivable, acquired portfolio | 456 |  | 561 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Total gross loans | 1,912 |  | 2,380 |  |  |
Unallocated [Member] |  |  |  |  |  |
ALLL |  |  |  |  |  |
ALLL, individually evaluated for impairment |  |  |  |  |  |
ALLL, collectively evaluated for impairment | 326 |  | 779 |  |  |
ALLL, acquired portfolio |  |  |  |  |  |
ALLL, acquired with deteriorated credit quality |  |  |  |  |  |
Total ALLL | $ 326 | $ 546 | $ 779 | $ 594 | $ 709 | $ 464

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