Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
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| Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items] | ||
| Assets pledged as collateral for Federal Home Loan Bank advances | $ 903,047 | $ 1,273,674 |
| Federal Home Loan Bank stock | 40,845 | 53,826 |
| Federal Home Loan Bank of Des Moines [Member] | ||
| Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items] | ||
| Federal Home Loan Bank stock | 40,845 | 53,826 |
| Available-for-sale Securities [Member] | ||
| Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items] | ||
| Assets pledged as collateral for Federal Home Loan Bank advances | 903,047 | 1,210,715 |
| Due From Correspondent Brokers [Member] | ||
| Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items] | ||
| Assets pledged as collateral for Federal Home Loan Bank advances | $ 0 | $ 62,959 |
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- Definition [Line Items] for Schedule, as of the most recent balance sheet date, of securities or other assets underlying Federal Home Loan Bank advances, including type of securities or assets and market value. No definition available.
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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