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Note Borrowings (Notes payable) (Parenthetical) (Detail) $ in Thousands | 9 Months Ended
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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%

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