Loans (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 297,064	$ 257,085
Loans 90 days or more past due and still accruing interest
Total TDR's	$ 5,276,000	$ 5,655,000
Allocated specific reserves to modified TDRs	$ 20	$ 64
Number of loans modified as a TDR \| loan	2	1
TDR's charge-offs	$ 0	$ 4
Number of TDRs in payment default \| loan	0	0
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%	80.00%
Ownership interest in each loan is participates	5.00%	20.00%
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]
Accounts Notes And Loans Receivable [Line Items]
Number of loans modified as a TDR \| loan	1
Single-Family Mortgage Loans [Member] \| Northpointe [Member] \| Mortgage Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 43,517	24,996
Home Equity Line of Credit, Originated Portfolio [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans modified as a TDR \| loan	1
Other Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR's	$ 19,097	20,719
Accruing [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR's	$ 4,920	$ 5,233

Allocated specific reserves to modified TDRs.

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- Definition

Loans Participation Agreement Percentage

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- Definition

Ownership Interest In Each Loan

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- Definition

Percent Of Loans Held Risk Rated For Capital Adequacy

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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=35738203&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to 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 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

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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=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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