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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | $ 9,139 |  | $ 689 |  |  |
Collectively evaluated for impairment | 117,587 |  | 79,595 |  |  |
Total Allowance for Loan Losses | 126,726 | $ 121,119 | 80,284 | $ 80,571 | $ 81,274 | $ 80,552
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 52,484 |  | 11,709 |  |  |
Collectively evaluated for impairment | 9,183,892 |  | 8,434,292 |  |  |
Loans | 9,243,833 |  | 8,459,310 |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 7,457 |  | 13,309 |  |  |
Commercial |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 601 |  | 0 |  |  |
Collectively evaluated for impairment | 44,746 |  | 32,902 |  |  |
Total Allowance for Loan Losses | 45,347 | 44,678 | 32,902 | 33,001 | 33,202 | 32,657
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 4,837 |  | 457 |  |  |
Collectively evaluated for impairment | 3,568,432 |  | 2,748,681 |  |  |
Loans | 3,573,968 |  | 2,750,854 |  |  |
Commercial | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 699 |  | 1,716 |  |  |
Commercial Real Estate |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 7,981 |  | 231 |  |  |
Collectively evaluated for impairment | 41,973 |  | 28,547 |  |  |
Total Allowance for Loan Losses | 49,954 | 46,918 | 28,778 | 28,966 | 29,531 | 29,609
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 44,203 |  | 8,728 |  |  |
Collectively evaluated for impairment | 3,819,629 |  | 3,821,660 |  |  |
Loans | 3,870,590 |  | 3,840,266 |  |  |
Commercial Real Estate | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 6,758 |  | 9,878 |  |  |
Consumer |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 9,378 |  | 4,035 |  |  |
Total Allowance for Loan Losses | 9,378 | 8,445 | 4,035 | 4,106 | 4,070 | 3,964
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 3 |  | 4 |  |  |
Collectively evaluated for impairment | 125,408 |  | 135,985 |  |  |
Loans | 125,411 |  | 135,989 |  |  |
Residential |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 557 |  | 458 |  |  |
Collectively evaluated for impairment | 21,490 |  | 14,111 |  |  |
Total Allowance for Loan Losses | 22,047 | $ 21,078 | 14,569 | $ 14,498 | $ 14,471 | $ 14,322
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 3,441 |  | 2,520 |  |  |
Collectively evaluated for impairment | 1,670,423 |  | 1,727,966 |  |  |
Loans | 1,673,864 |  | 1,732,201 |  |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | $ 0 |  | $ 1,715 |  |  |

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