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FHLB Advances, Other Borrowings and Junior Subordinated Notes FHLB Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Borrowed funds $ 308,977 $ 217,917
Loans pledged as collateral for Federal Home Loan Bank advances and unused available credit 435,200 388,200
FHLB advances and other borrowings    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank line of credit maximum available 435,200  
Federal Home Loan Bank unused line remaining 160,700  
Line of credit, amount outstanding 0 0
FHLB advances and other borrowings    
Line of Credit Facility [Line Items]    
Borrowed funds $ 274,500 $ 183,500
FHLB advances and other borrowings | Minimum    
Line of Credit Facility [Line Items]    
Fixed rate 1.29% 1.20%
FHLB advances and other borrowings | Maximum    
Line of Credit Facility [Line Items]    
Fixed rate 2.75% 2.42%