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Other Borrowings and Notes Payable (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Feb. 23, 2016
Nov. 06, 2012
Debt Instrument [Line Items]        
Securities sold under repurchase agreements $ 276,980,000 $ 270,326,000    
Total 276,980,000 270,326,000    
Unsecured Lines of Credit     $ 20,000,000  
Line of Credit        
Debt Instrument [Line Items]        
Remaining borrowing capacity 933,900,000      
Aggregate of pledge secured by certain eligible loans 1,147,200,000      
Amount withdrawn 0      
Other Borrowings        
Debt Instrument [Line Items]        
Average balance during the year 206,643,000 195,328,000    
Maximum balance outstanding at any month-end $ 276,980,000 $ 270,326,000    
Average interest rate during the year 0.19% 0.22%    
Average interest rate at December 31 0.18% 0.16%    
Unsecured Term Loan        
Debt Instrument [Line Items]        
Average balance during the year   $ 4,509,000    
Maximum balance outstanding at any month-end   $ 5,700,000    
Average interest rate during the year   3.01%    
Average interest rate at December 31   0.00%    
Unsecured term loan, face amount       $ 12,000,000
Term Loan   $ 0