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Purchased Loans - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Allowance for loan losses attributable to restructured loans $ 50,059,000   $ 50,059,000   $ 49,026,000
Purchased loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Number of Loans | loan 2 1 2 3  
Modifications with subsequent default     $ 0 $ 5,000  
Number of restructured loans | loan     1 4  
Restructured loans discontinued past due period     90 days 90 days  
Remaining availability under commitments to lend additional funds on restructured loans $ 3,000 $ 2,000 $ 3,000 $ 2,000  
Purchased loans | Nonaccruing Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 167,000 425,000 167,000 425,000  
Purchased loans | Restructured Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 1,276,000 684,000 1,276,000 684,000  
Allowance for loan losses attributable to restructured loans $ 79,000 $ 69,000 $ 79,000 $ 69,000