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Loans And Leases (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans |  | $ 422,495,000 |  | $ 406,406,000
Cash payments of interest |  | 50,000 | $ 56,000 |
Loans 90 days or more past due and still accruing interest |  |  |  |
Number of days of default payment |  | 90 days |  |
Total TDR's |  | $ 3,301,000 |  | 3,386,000
Allocated specific reserves to modified TDRs |  | 26,000 |  | 25,000
Commitment to lend additional amounts |  | $ 0 |  | 0
Number of TDRs in payment default | loan |  | 0 |  |
Recorded investment of loans undergoing modifications, not TDRs |  | $ 22,359,000 | $ 12,915,000 |
Accruing TDR's |  | 3,190,000 |  | 3,271,000
Loans And Leases Receivable Net Of Deferred Income |  | 429,471,000 |  | 413,376,000
Doubtful [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivable Net Of Deferred Income |  | $ 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 |  |
Percent of participation agreement interest |  | 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 |  | $ 99,409,000 |  | 95,578,000
Single-Family Residential [Member] | Northpointe [Member] | Mortgage Purchase Program Member [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans |  | 28,284,000 |  | 37,665,000
Commercial [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivable Net Of Deferred Income | [1] | $ 100,732,000 |  | $ 101,975,000
[1] | Includes $5,859 and $6,008 of commercial leases at March 31, 2018 and December 31, 2017, respectively.

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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