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Loans And Leases (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | $ 493,529,000 |  | $ 493,529,000 |  | $ 406,406,000
Cash payments of interest | 52,000 | $ 52,000 | 151,000 | $ 164,000 |
Loans 90 days or more past due and still accruing interest |  |  |  |  |
Number of days of default payment |  |  | 90 days |  |
Total TDR's | 3,266,000 |  | $ 3,266,000 |  | 3,386,000
Allocated specific reserves to modified TDRs | 24,000 |  | 24,000 |  | 26,000
Commitment to lend additional amounts | $ 0 |  | $ 0 |  | 0
Number of loans modified as a TDR | loan | 0 | 0 | 0 | 1 |
Loans modified as TDR, amount |  |  |  | $ 841,000 |
Number of TDRs in payment default | loan |  |  | 0 | 0 |
Recorded investment of loans undergoing modifications, not TDRs | $ 10,210,000 | $ 10,843,000 | $ 10,210,000 | $ 10,843,000 |
Accruing TDR's | 3,163,000 |  | 3,163,000 |  | 3,271,000
Loans And Leases Receivable Net Of Deferred Income | 500,534,000 |  | 500,534,000 |  | 413,376,000
Doubtful [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans And Leases Receivable Net Of Deferred Income | 0 |  | $ 0 |  | 0
Northpointe [Member] | Mortgage Purchase Program Member [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percent of loans risk rated for capital adequacy |  |  | 100.00% |  |
Mortgage allowance | $ 0 |  | $ 0 |  |
Percent of participation agreement interest | 95.00% |  | 95.00% |  |
Ownership interest in each loan it participates |  |  | 5.00% |  |
Single-Family Residential [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans And Leases Receivable Net Of Deferred Income | $ 93,982,000 |  | $ 93,982,000 |  | 95,578,000
Single-Family Residential [Member] | Northpointe [Member] | Mortgage Purchase Program Member [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans | 134,000 |  | 134,000 |  | 37,665,000
Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans And Leases Receivable Net Of Deferred Income | $ 131,176,000 |  | $ 131,176,000 |  | $ 101,975,000

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