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Purchased Loans - Fair Value of Acquired Loans (Details) - Purchased
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Fair value of loans contractual principal cash flows amount $ 44,115
Fair value of loans contractual interest cash flows 6,972
Fair value of loans contractual purchase discount 1,615
Fair value of loans contractual interest payments 22,417
Receivables Acquired with Deteriorated Credit Quality  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Contractually-required principal and interest 247,383
Nonaccretable difference (51,087)
Cash flows expected to be collected 196,296
Accretable yield (24,032)
Fair value $ 172,264