Note Borrowings (Notes payable) (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Advances due 2016 To 2029 with fixed Rates 0.41% to 4.19% for 2015 and 0.45% to 4.19% for 2014
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	0.41%	0.45%
Advances with the FHLB, interest rate range to	4.19%	4.19%
Floating Rates of 0.24% over the 3 month LIBOR maturing on 2019
Debt Instrument [Line Items]
Advances with the FHLB, maturity	2019
Advances with the FHLB, interest rate	0.24%
Fixed Rate 7.00% Percent Notes Due July 2019 paying interest semiannually
Debt Instrument [Line Items]
Senior debt fixed rate	7.00%
Senior Debt Maturity Year	2019
Fixed Rate 6.125% to 8.327% Junior Subordinated Deferrable Interest Debentures Due 2027 to 2034
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

Latest year the outstanding debt instruments are required to be repaid.

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Earliest year the outstanding debt instruments are required to be repaid.

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Maturity year the outstanding debt instruments are required to be repaid.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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The year of maturity, when only one maturity date applies, for the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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The earliest year of maturity for the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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The last year of maturity for the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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States the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the highest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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