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Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | loan 1 3 1
Pre-Modification Outstanding Recorded Balance $ 187 $ 520 $ 187
Post-Modification Outstanding Recorded Balance $ 187 $ 520 $ 187
Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | loan 1 0 1
Pre-Modification Outstanding Recorded Balance $ 187 $ 0 $ 187
Post-Modification Outstanding Recorded Balance $ 187 $ 0 $ 187
CRE - owner occupied      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | loan   1 0
Pre-Modification Outstanding Recorded Balance   $ 188 $ 0
Post-Modification Outstanding Recorded Balance   $ 188 $ 0
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | loan   2 0
Pre-Modification Outstanding Recorded Balance   $ 332 $ 0
Post-Modification Outstanding Recorded Balance   $ 332 $ 0