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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Allowance Balances: |  |  |  |
Individually evaluated for impairment | $ 616 | $ 689 |  |
Collectively evaluated for impairment | 98,838 | 79,595 |  |
Total Allowance for Loan Losses | 99,454 | 80,284 | $ 80,902 | $ 80,552
Loan Balance [Abstract] |  |  |  |
Individually evaluated for impairment | 12,813 | 11,709 |  |
Collectively evaluated for impairment | 8,583,450 | 8,434,292 |  |
Loans | 8,606,849 | 8,459,310 |  |
Loans acquired with deteriorated credit quality |  |  |  |
Loan Balance [Abstract] |  |  |  |
Loans | 10,586 | 13,309 |  |
Commercial |  |  |  |
Allowance Balances: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 38,431 | 32,902 |  |
Total Allowance for Loan Losses | 38,431 | 32,902 | 33,069 | 32,657
Loan Balance [Abstract] |  |  |  |
Individually evaluated for impairment | 905 | 457 |  |
Collectively evaluated for impairment | 2,870,855 | 2,748,681 |  |
Loans | 2,873,288 | 2,750,854 |  |
Commercial | Loans acquired with deteriorated credit quality |  |  |  |
Loan Balance [Abstract] |  |  |  |
Loans | 1,528 | 1,716 |  |
Commercial Real Estate |  |  |  |
Allowance Balances: |  |  |  |
Individually evaluated for impairment | 150 | 231 |  |
Collectively evaluated for impairment | 37,757 | 28,547 |  |
Total Allowance for Loan Losses | 37,907 | 28,778 | 29,434 | 29,609
Loan Balance [Abstract] |  |  |  |
Individually evaluated for impairment | 9,282 | 8,728 |  |
Collectively evaluated for impairment | 3,895,221 | 3,821,660 |  |
Loans | 3,911,842 | 3,840,266 |  |
Commercial Real Estate | Loans acquired with deteriorated credit quality |  |  |  |
Loan Balance [Abstract] |  |  |  |
Loans | 7,339 | 9,878 |  |
Consumer |  |  |  |
Allowance Balances: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 5,752 | 4,035 |  |
Total Allowance for Loan Losses | 5,752 | 4,035 | 4,026 | 3,964
Loan Balance [Abstract] |  |  |  |
Individually evaluated for impairment | 3 | 4 |  |
Collectively evaluated for impairment | 129,762 | 135,985 |  |
Loans | 129,765 | 135,989 |  |
Residential |  |  |  |
Allowance Balances: |  |  |  |
Individually evaluated for impairment | 466 | 458 |  |
Collectively evaluated for impairment | 16,898 | 14,111 |  |
Total Allowance for Loan Losses | 17,364 | 14,569 | $ 14,373 | $ 14,322
Loan Balance [Abstract] |  |  |  |
Individually evaluated for impairment | 2,623 | 2,520 |  |
Collectively evaluated for impairment | 1,687,612 | 1,727,966 |  |
Loans | 1,691,954 | 1,732,201 |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |
Loan Balance [Abstract] |  |  |  |
Loans | $ 1,719 | $ 1,715 |  |

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