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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Allowance Balances: |  |
Individually evaluated for impairment |  | $ 12,901
Collectively evaluated for impairment |  | 117,747
Total Allowance for Loan Losses |  | 130,648
Loan Balances: |  |
Individually evaluated for impairment | $ 49,643 | 56,156
Collectively evaluated for impairment |  | 9,180,857
Financing Receivable, Evaluated for Impairment |  | 9,243,174
Loans acquired with deteriorated credit quality |  |
Loan Balances: |  |
Financing Receivable, Evaluated for Impairment |  | 6,161
Commercial |  |
Allowance Balances: |  |
Individually evaluated for impairment |  | 223
Collectively evaluated for impairment |  | 46,892
Total Allowance for Loan Losses |  | 47,115
Loan Balances: |  |
Individually evaluated for impairment |  | 1,258
Collectively evaluated for impairment |  | 3,505,863
Financing Receivable, Evaluated for Impairment |  | 3,507,698
Commercial | Loans acquired with deteriorated credit quality |  |
Loan Balances: |  |
Financing Receivable, Evaluated for Impairment |  | 577
Commercial Real Estate |  |
Allowance Balances: |  |
Individually evaluated for impairment |  | 12,246
Collectively evaluated for impairment |  | 38,824
Total Allowance for Loan Losses |  | 51,070
Loan Balances: |  |
Individually evaluated for impairment |  | 51,605
Collectively evaluated for impairment |  | 3,805,808
Financing Receivable, Evaluated for Impairment |  | 3,862,997
Commercial Real Estate | Loans acquired with deteriorated credit quality |  |
Loan Balances: |  |
Financing Receivable, Evaluated for Impairment |  | 5,584
Consumer |  |
Allowance Balances: |  |
Individually evaluated for impairment |  | 0
Collectively evaluated for impairment |  | 9,648
Total Allowance for Loan Losses |  | 9,648
Loan Balances: |  |
Individually evaluated for impairment |  | 2
Collectively evaluated for impairment |  | 129,477
Financing Receivable, Evaluated for Impairment |  | 129,479
Residential |  |
Allowance Balances: |  |
Individually evaluated for impairment |  | 432
Collectively evaluated for impairment |  | 22,383
Total Allowance for Loan Losses |  | 22,815
Loan Balances: |  |
Individually evaluated for impairment | 2,927 | 3,291
Collectively evaluated for impairment |  | 1,739,709
Financing Receivable, Evaluated for Impairment |  | 1,743,000
Residential | Loans acquired with deteriorated credit quality |  |
Loan Balances: |  |
Financing Receivable, Evaluated for Impairment |  | $ 0
Home equity |  |
Loan Balances: |  |
Individually evaluated for impairment | $ 402 |

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