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Borrowings - Federal Home Loan Bank Advances (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
derivative
Jul. 31, 2017
USD ($)
Jun. 30, 2017
derivative
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Collateral securing line of credit $ 1,227,711 $ 968,567    
Total borrowing capacity remaining 736,962 671,461    
Letter of credit pledged 100,000      
Line of credit secured 800,000      
Borrowings against line of credit $ 181,765 $ 302,372    
Notional Amount     $ 100,000  
Average interest rate on outstanding advances 1.93%      
Interest rate swaps        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Number of derivative instruments | derivative   3   3
Interest Rate Swaps Five        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Notional Amount   $ 35,000 35,000  
Interest Rate Swaps Three        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Notional Amount   30,000 30,000  
Interest Rate Swaps Four        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Notional Amount   35,000 $ 35,000  
Long Term Advances        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Borrowings against line of credit $ 1,765 12,372    
Cash Management Advances        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Borrowings against line of credit 80,000 190,000    
90 Day Fixed Rate Advance        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Borrowings against line of credit 100,000 100,000    
Federal Reserve Bank        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Line of credit $ 934,745 529,547    
Minimum        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Floating and fixed interest rates 2.43%      
Maximum        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Floating and fixed interest rates 7.78%      
Collateral Pledged        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Securities pledged $ 326,215 337,604    
Collateral Pledged | Federal Reserve Bank        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Securities pledged 8,569 13,544    
Federal Reserve        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Pledged loans to the Federal Reserve Bank $ 1,336,092 $ 737,856