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FHLB Advances, Other Borrowings and Junior Subordinated Notes Subordinated notes payable and junior subordinated notes payable (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Subordinated Borrowing [Line Items]    
Junior subordinated notes and other borrowings $ 329,429,000 $ 308,977,000
Repayment of subordinated notes payable 15,000,000 0
Unamortized Debt Issuance Cost, Subordinated Notes 383,000  
Subordinated Debt    
Subordinated Borrowing [Line Items]    
Junior subordinated notes and other borrowings 23,707,000 $ 23,769,000
Maturity date August 15, 2029 | Subordinated Debt    
Subordinated Borrowing [Line Items]    
Junior subordinated notes and other borrowings $ 15,000,000  
Fixed rate 5.50%  
Maturity date April 15, 2027 | Subordinated Debt    
Subordinated Borrowing [Line Items]    
Junior subordinated notes and other borrowings $ 9,100,000  
Fixed rate 6.00%