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Other Borrowings - Lines of Credit (Details) - USD ($)
$ in Thousands
Nov. 15, 2019
Dec. 31, 2019
Dec. 31, 2018
Principal maturities of other borrowings      
2020   $ 700,007  
2021   8  
2022   8  
2023   8  
2024   8  
Thereafter   115,897  
Total borrowings   815,936 $ 266,084
Unsecured line of credit      
Other Borrowings      
Maximum borrowing capacity $ 25,000 0 $ 0
Junior Subordinated Debt      
Principal maturities of other borrowings      
Thereafter   115,833  
Total borrowings   115,833  
FHLB Advances      
Principal maturities of other borrowings      
2020   700,000  
Total borrowings   700,000  
Other      
Principal maturities of other borrowings      
2020   7  
2021   8  
2022   8  
2023   8  
2024   8  
Thereafter   64  
Total borrowings   $ 103  
LIBOR | Unsecured line of credit      
Other Borrowings      
Spread on variable rate basis (as a percent) 1.35%