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Borrowed Funds and Subordinated Debentures - Scheduled Maturities of Term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
2019 $ 210,000    
2020 0    
2021 0    
2022 0    
2023 0    
Thereafter 10,310    
Total 220,310    
FHLB borrowings and repurchase agreements:      
Debt Instrument [Line Items]      
2019 210,000    
2020 0    
2021 0    
2022 0    
2023 0    
Thereafter 0    
Total 210,000    
Repurchase agreements:      
Debt Instrument [Line Items]      
Total 0 $ 15,000 $ 15,000
Subordinated debentures      
Debt Instrument [Line Items]      
2019 0    
2020 0    
2021 0    
2022 0    
2023 0    
Thereafter 10,310    
Total $ 10,310 $ 10,310 $ 10,310