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Note Borrowings (Notes payable) (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Advances due 2016 To 2029 with fixed Rates 0.41% to 4.19% for 2016 and 2015    
Debt Instrument [Line Items]    
Advances with the FHLB, earliest maturity 2016  
Advances with the FHLB, latest maturity 2029  
Advances with the FHLB, interest rate range from 0.71% 0.45%
Advances with the FHLB, interest rate range to 4.19% 4.19%
Floating Rate of 0.34% over the 1 month LIBOR maturing on 2019    
Debt Instrument [Line Items]    
Advances with the FHLB, maturity 2019  
Advances with the FHLB, interest rate 0.34%  
Floating Rate from 0.01% to 0.24% over the 3 month LIBOR with maturities ranging from 2017 to 2019    
Debt Instrument [Line Items]    
Advances with the FHLB, earliest maturity 2017  
Advances with the FHLB, latest maturity 2019  
Advances with the FHLB, interest rate range from 0.01%  
Advances with the FHLB, interest rate range to 0.24%  
Fixed Rate 7.00% Percent Notes Due July 2019 paying interest semiannually, net of debt issuance costs of $6,775 for 2016 $7,296 for 2015    
Debt Instrument [Line Items]    
Senior debt fixed rate 7.00%  
Senior Debt Maturity Year 2019  
Debt issuance costs line of credit arrangements net $ 6,775 $ 7,296
Fixed Rate 6.125% to 8.327% Junior Subordinated Deferrable Interest Debentures Due 2027 to 2034, net of debt issuance costs of $497 for 2016 and $505 for 2015    
Debt Instrument [Line Items]    
Notes payable, interest rate range minimum 6.125%  
Notes payable, interest rate range maximum 8.327%  
Notes Payable Maturity Year Range Start 2027  
Notes Payable Maturity Year Range End 2034  
Debt issuance costs line of credit arrangements net $ 497 $ 505