Loans, Allowance for Loan Losses and Impaired Loans - Schedule of Acquired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 1,187,264	$ 999,433
Carrying amount	1,187,264	999,433
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	424,744	$ 379,644
Carrying amount	415,253
Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	38,268
Carrying amount	31,978
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	386,476
Carrying amount	$ 383,275