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Fair Value of Assets and Liabilities - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | $ 14,033 |  | $ 16,273 |  |
Loans, net of unearned income |  | 31,061,111 | [1] | 27,535,532 | [1] | $ 27,658,929
Other real estate owned (OREO) | [2] | 17,838 |  | 25,290 |  |
Non Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 42,208 |  | 48,259 |  | 26,666
Other real estate owned (OREO) |  | 15,660 |  | 22,387 |  | 39,566
Other assets |  | 10,608 |  | 8,845 |  | 26,521
Net gains (losses) loans, net of unearned income |  | (7,341) |  | (841) |  | (1,687)
Net gains (losses) other real estate owned |  | (927) |  | (2,599) |  | (996)
Net gains (losses) other assets |  | (1,809) |  | (4,712) |  | (3,468)
Net gains (losses) financial assets |  | (11,862) |  | (12,489) |  | (7,744)
Non Recurring | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 493,524 |  | 578,291 |  | 466,977
Net gains (losses) loans held-for-sale |  | (1,817) |  | (2,541) |  | (1,629)
Non Recurring | Other Consumer Loans Class |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  | 18,712 |  |
Net gains (losses) loans held-for-sale |  |  |  | (1,809) |  |
Non Recurring | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 516 |  | 541 |  | 618
Net gains (losses) loans held-for-sale |  | 32 |  | 13 |  | 36
Non Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 0 |  | 0 |  | 0
Other real estate owned (OREO) |  | 0 |  | 0 |  | 0
Other assets |  | 0 |  | 0 |  | 0
Non Recurring | Level 1 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  | 0
Non Recurring | Level 1 | Other Consumer Loans Class |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  | 0 |  |
Non Recurring | Level 1 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  | 0
Non Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 0 |  | 0 |  | 0
Other real estate owned (OREO) |  | 0 |  | 0 |  | 0
Other assets |  | 0 |  | 0 |  | 0
Non Recurring | Level 2 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 492,595 |  | 577,280 |  | 465,504
Non Recurring | Level 2 | Other Consumer Loans Class |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  | 18,712 |  |
Non Recurring | Level 2 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  | 0
Non Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 42,208 |  | 48,259 |  | 26,666
Other real estate owned (OREO) |  | 15,660 |  | 22,387 |  | 39,566
Other assets |  | 10,608 |  | 8,845 |  | 26,521
Non Recurring | Level 3 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 929 |  | 1,011 |  | 1,473
Non Recurring | Level 3 | Other Consumer Loans Class |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  | 0 |  |
Non Recurring | Level 3 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | $ 516 |  | $ 541 |  | $ 618
[1] | December 31, 2019 and 2018 include $18.8 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] | December 31, 2019 and 2018 include $9.2 million and $9.7 million, respectively, of foreclosed residential real estate.

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