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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | $ 12,999 |  | $ 689 |  |  |
Collectively evaluated for impairment | 108,120 |  | 79,595 |  |  |
Total Allowance for Loan Losses | 121,119 | $ 99,454 | 80,284 | $ 81,274 | $ 80,902 | $ 80,552
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 45,280 |  | 11,709 |  |  |
Collectively evaluated for impairment | 9,244,980 |  | 8,434,292 |  |  |
Loans | 9,298,541 |  | 8,459,310 |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 8,281 |  | 13,309 |  |  |
Commercial |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 7,466 |  | 0 |  |  |
Collectively evaluated for impairment | 37,212 |  | 32,902 |  |  |
Total Allowance for Loan Losses | 44,678 | 38,431 | 32,902 | 33,202 | 33,069 | 32,657
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 15,312 |  | 457 |  |  |
Collectively evaluated for impairment | 3,600,395 |  | 2,748,681 |  |  |
Loans | 3,616,871 |  | 2,750,854 |  |  |
Commercial | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 1,164 |  | 1,716 |  |  |
Commercial Real Estate |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 4,943 |  | 231 |  |  |
Collectively evaluated for impairment | 41,975 |  | 28,547 |  |  |
Total Allowance for Loan Losses | 46,918 | 37,907 | 28,778 | 29,531 | 29,434 | 29,609
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 26,512 |  | 8,728 |  |  |
Collectively evaluated for impairment | 3,847,884 |  | 3,821,660 |  |  |
Loans | 3,880,558 |  | 3,840,266 |  |  |
Commercial Real Estate | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | 6,162 |  | 9,878 |  |  |
Consumer |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 8,445 |  | 4,035 |  |  |
Total Allowance for Loan Losses | 8,445 | 5,752 | 4,035 | 4,070 | 4,026 | 3,964
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 3 |  | 4 |  |  |
Collectively evaluated for impairment | 123,608 |  | 135,985 |  |  |
Loans | 123,611 |  | 135,989 |  |  |
Residential |  |  |  |  |  |
Allowance Balances: |  |  |  |  |  |
Individually evaluated for impairment | 590 |  | 458 |  |  |
Collectively evaluated for impairment | 20,488 |  | 14,111 |  |  |
Total Allowance for Loan Losses | 21,078 | $ 17,364 | 14,569 | $ 14,471 | $ 14,373 | $ 14,322
Loan Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 3,453 |  | 2,520 |  |  |
Collectively evaluated for impairment | 1,673,093 |  | 1,727,966 |  |  |
Loans | 1,677,501 |  | 1,732,201 |  |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |  |  |
Loan Balance [Abstract] |  |  |  |  |  |
Loans | $ 955 |  | $ 1,715 |  |  |

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