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Borrowings (Long-Term Obligations) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net | $ (3,459) | $ 0
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2021 | 10,000 |
2022 | 98,709 |
2023 | 125,500 |
2024 | 6,144 |
2025 | 7,500 |
Thereafter | 1,000,310 |
Total long-term obligations | 1,248,163 | 588,638
Trust Preferred Securities | 128,500 |
Subordinated Debt [Member] | Fixed-to-Floating subordinated notes at 3.375% maturing March 15, 2030 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 350,000 | 0
Debt interest rate | 3.375% |
Junior Subordinated Debt [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 132,500 |
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 88,145 | 88,145
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036 | Libor 3 Month Rate [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Description of variable rate basis | 3-month LIBOR |
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 19,588 | 19,588
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034 | Libor 3 Month Rate [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Description of variable rate basis | 3-month LIBOR |
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 10,310 | 10,310
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034 | Libor 3 Month Rate [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.85% |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Description of variable rate basis | 3-month LIBOR |
Junior Subordinated Debt [Member] | Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 14,433 | 14,433
Junior Subordinated Debt [Member] | Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034 | Libor 3 Month Rate [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.80% |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Description of variable rate basis | 3-month LIBOR |
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.00% maturing December 31, 2026(1) |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 20,000 | 20,000
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.00% maturing December 31, 2026(1) | Libor 3 Month Rate [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Debt interest rate | 7.00% |
Junior Subordinated Debt [Member] | Junior subordinated debentures at 6.50% maturing October 1, 2025(2) |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 7,500 | 7,500
Junior Subordinated Debt [Member] | Junior subordinated debentures at 6.50% maturing October 1, 2025(2) | Libor 3 Month Rate [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Debt interest rate | 6.50% |
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.13% called February 25, 2020(2) |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 0 | 5,000
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.13% called February 25, 2020(2) | Libor 3 Month Rate [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Debt interest rate | 7.13% |
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 655,175 | 317,191
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 | Minimum |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Debt interest rate | 0.75% |
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 | Maximum |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Debt interest rate | 2.99% |
Unsecured Term Loan [Member] | Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022 |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 82,125 | 96,425
Unsecured Term Loan [Member] | Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022 | Libor 1 Month Rate [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.10% |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Description of variable rate basis | 1-month LIBOR |
Capital Lease Obligations [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 6,308 | 8,230
Unamortized Purchase Accounting Adjustments [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | (1,999) | (1,569)
Other Long Term Debt [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Total long-term obligations | $ 37 | $ 3,385

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