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FDIC-Acquired Loans and Loss Sharing Agreements - Fair Value and Expected Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
FDIC-Acquired Loans and Loss Sharing Agreements |  |
Increase in accretable yield due to increased cash flow expectations | $ 12,323 | $ 5,202

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