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Loans And Leases (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Accounts Notes And Loans Receivable [Line Items] |  |
Loans | $ 406,406 | $ 346,125
Loans 90 days or more past due and still accruing interest |  |
Total TDR's | 3,386 | 3,130
Allocated specific reserves to modified TDRs | $ 25 | $ 22
Number of loans modified as a TDR | loan | 1 | 1
TDR's charge-offs | $ 0 | $ 0
Number of TDRs in payment default | loan |  | 1
Cash payments of interest | $ 190 | $ 216
Northpointe [Member] | Mortgage Purchase Program [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Percent of loans risk rated for capital adequacy | 100.00% |
Percent of participation agreement interest | 95.00% |
Ownership interest in each loan is participates | 5.00% |
Nonaccrual [Member] | Commitments to Lend Additional Amounts [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total TDR's | $ 0 | 0
Single-Family Mortgage Loans [Member] | Northpointe [Member] | Mortgage Purchase Program [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans | 37,665 | 46,919
Other Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total TDR's | 46,731 | 33,294
Accruing [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total TDR's | $ 3,271 | $ 2,986
Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Number of loans modified as a TDR | loan | 1 | 1
TDR's charge-offs | $ 841 | $ 239

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Amount after allowance and 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 and loans held for sale. + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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