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Loans and Allowance for Credit Losses - Amortized cost basis of collateral-dependent loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | $ 7,424,619 | $ 7,650,633
Business or Other Assets |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 13,503 | 14,519
Business or Other Assets | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 10,310 | 11,326
Business or Other Assets | Income producing - commercial real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 3,193 | 3,193
Business or Other Assets | Owner occupied - commercial real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 0 | 0
Business or Other Assets | Real estate mortgage - residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 0 | 0
Business or Other Assets | Construction - commercial and residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 0 | 0
Business or Other Assets | Home equity |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 0 | 0
Business or Other Assets | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 0 | 0
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 49,100 | 46,424
Real Estate | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 9,339 | 4,026
Real Estate | Income producing - commercial real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 23,135 | 15,686
Real Estate | Owner occupied - commercial real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 14,075 | 23,159
Real Estate | Real estate mortgage - residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 1,942 | 2,932
Real Estate | Construction - commercial and residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 196 | 206
Real Estate | Home equity |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | 413 | 415
Real Estate | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
PPP loans, net | $ 0 | $ 0

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