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Note Borrowings (Notes payable) (Parenthetical) (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Advances due 2018 To 2029 with fixed Rates 0.89% to 4.19%  
Debt Instrument [Line Items]  
Advances with the FHLB, earliest maturity 2018
Advances with the FHLB, latest maturity 2029
Advances due 2018 To 2029 with fixed Rates 0.89% to 4.19% | Maximum  
Debt Instrument [Line Items]  
Advances with the FHLB, interest rate 4.19%
Advances due 2018 To 2029 with fixed Rates 0.89% to 4.19% | Minimum  
Debt Instrument [Line Items]  
Advances with the FHLB, interest rate 0.89%
Floating Rate from of 0.34% over the 1 month LIBOR with maturities on 2019  
Debt Instrument [Line Items]  
Advances with the FHLB, interest rate 0.34%
Advances with the FHLB, maturity 2019
Floating Rate from 0.12% to 0.24% over the 3 month LIBOR with maturities on 2019  
Debt Instrument [Line Items]  
Advances with the FHLB, maturity 2019
Floating Rate from 0.12% to 0.24% over the 3 month LIBOR with maturities on 2019 | Maximum  
Debt Instrument [Line Items]  
Advances with the FHLB, interest rate 0.24%
Floating Rate from 0.12% to 0.24% over the 3 month LIBOR with maturities on 2019 | Minimum  
Debt Instrument [Line Items]  
Advances with the FHLB, interest rate 0.12%
Fixed Rate from 6.125% to 7.00% Percent Notes paying interest semiannually, net of debt issuance costs of $7,841  
Debt Instrument [Line Items]  
Notes Payable Maturity Year Range Start 2019
Notes Payable Maturity Year Range End 2023
Debt issuance costs line of credit arrangements net $ 7,841
Fixed Rate from 6.125% to 7.00% Percent Notes paying interest semiannually, net of debt issuance costs of $7,841 | Maximum  
Debt Instrument [Line Items]  
Interest Rate Percentage 7.00%
Fixed Rate from 6.125% to 7.00% Percent Notes paying interest semiannually, net of debt issuance costs of $7,841 | Minimum  
Debt Instrument [Line Items]  
Interest Rate Percentage 6.125%
Fixed Rate 6.125% to 6.7% Junior Subordinated Deferrable Interest Debentures Due 2033 to 2034, net of debt issuance costs of $429  
Debt Instrument [Line Items]  
Notes Payable Maturity Year Range Start 2033
Notes Payable Maturity Year Range End 2034
Debt issuance costs line of credit arrangements net $ 429
Fixed Rate 6.125% to 6.7% Junior Subordinated Deferrable Interest Debentures Due 2033 to 2034, net of debt issuance costs of $429 | Maximum  
Debt Instrument [Line Items]  
Interest Rate Percentage 6.70%
Fixed Rate 6.125% to 6.7% Junior Subordinated Deferrable Interest Debentures Due 2033 to 2034, net of debt issuance costs of $429 | Minimum  
Debt Instrument [Line Items]  
Interest Rate Percentage 6.125%