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Borrowings - Lines of Credit (Details) - USD ($)
3 Months Ended
Feb. 05, 2008
Mar. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]      
Periodic term lender may accelerate due date   3 months  
Federal Funds Purchased | Line of credit      
Line of Credit Facility [Line Items]      
Amount of borrowings outstanding   $ 2,000,000 $ 0
Federal Home Loan Bank Borrowings | Line of credit      
Line of Credit Facility [Line Items]      
Lines of credit   $ 507,800,000 470,600,000
Term of FHLB borrowing agreements 10 years    
Principal amount of borrowing agreements with FHLB $ 15,000,000    
Fixed interest rate of FHLB borrowing agreement 2.07%    
Periodic term interest-only payments are due   3 months  
Remaining available line of credit from FHLB   $ 490,200,000 403,400,000
Federal Home Loan Bank Borrowings | Letters of credit      
Line of Credit Facility [Line Items]      
Amount of borrowings outstanding   241,000  
Federal Home Loan Bank Overnight Borrowings | Line of credit      
Line of Credit Facility [Line Items]      
Amount of borrowings outstanding   2,350,000 52,000,000
Federal Reserve Line of Credit | Line of credit      
Line of Credit Facility [Line Items]      
Lines of credit   39,300,000 37,800,000
Amount of borrowings outstanding   0 0
Unsecured Debt | Federal Funds Purchased | Line of credit      
Line of Credit Facility [Line Items]      
Lines of credit   $ 92,000,000 $ 92,000,000