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Note Borrowings (Notes payable) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Others $ 18,779 $ 19,008
Notes payable 1,583,468 1,662,508
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 638,848 747,072
Floating Rate of 0.34% over the 1 month LIBOR maturing on 2019    
Debt Instrument [Line Items]    
Advances with the FHLB 13,000 0
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 30,313 14,429
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]    
Long Term Debt 443,225 442,704
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]    
Long Term Debt $ 439,303 $ 439,295