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Loans (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) loan | Jun. 30, 2015 USD ($) item loan | Jun. 30, 2014 USD ($) loan | Dec. 31, 2014 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | $ 284,160,000 |  | $ 284,160,000 |  | $ 257,085,000
Cash payments of interest | 84,000 | $ 51,000 | 166,000 | $ 106,000 |
Loans 90 days or more past due and still accruing interest | 0 |  | 0 |  | 0
Allocated specific reserves to modified TDRs | 46,000 |  | $ 46,000 |  | 64,000
Number of days of default payment |  |  | 90 days |  |
Total TDR's | 5,417,000,000 |  | $ 5,417,000,000 |  | 5,655,000,000
Accruing TDR's | 5,030,000 |  | $ 5,030,000 |  | $ 5,233,000
Number of loans modified as a TDR | loan |  | 0 |  | 0 |
Number of TDRs in payment default | loan |  |  | 0 | 0 |
Recorded investment of loans undergoing modifications, not TDRs | 4,575,000,000 | $ 8,567,000,000 | $ 4,575,000,000 | $ 8,567,000,000 |
Minimum [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percent of participation agreement interest |  |  |  |  | 80.00%
Maximum [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percent of participation agreement interest |  |  |  |  | 95.00%
Mortgage Purchase Program Member [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percent of loans risk rated for capital adequacy |  |  | 100.00% |  |
Northpointe [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Ownership interest in each loan is participates |  |  | 5.00% |  | 20.00%
Home Equity Line of Credit [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | 9,000 |  | $ 9,000 |  |
Number of loans modified as a TDR | item |  |  | 1 |  |
Single-Family Residential[Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | 9,000 |  | $ 9,000 |  |
Number of loans modified as a TDR | loan |  |  | 1 |  |
Single-Family Residential[Member] | Mortgage Purchase Program Member [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | $ 37,644,000 |  | $ 37,644,000 |  | $ 24,996,000

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