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Loans And Leases (Narrative) (Details)		3 Months Ended		9 Months Ended
		Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan	Dec. 31, 2016 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans		$ 387,749,000		$ 387,749,000		$ 346,125,000
Cash payments of interest		52,000	$ 60,000	164,000	$ 174,000
Loans 90 days or more past due and still accruing interest
Number of days of default payment				90 days
Total TDR's		3,746,000		$ 3,746,000		3,130,000
Allocated specific reserves to modified TDRs		25,000		25,000		22,000
Commitment to lend additional amounts		0		$ 0		0
Number of loans modified as a TDR | loan			1	1	1
Number of TDRs in payment default | loan				0	1
Recorded investment of loans undergoing modifications, not TDRs		10,843,000	$ 18,255,000	$ 10,843,000	$ 18,255,000
Accruing TDR's		3,627,000		3,627,000		2,986,000
Loans And Leases Receivable Net Of Deferred Income		394,713,000		394,713,000		353,050,000
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		$ 93,025,000		$ 93,025,000		92,544,000
Single-Family Residential [Member] | Northpointe [Member] | Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans		37,618,000		37,618,000		46,919,000
Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR's		841,000	$ 339,000	841,000	$ 339,000
Loans And Leases Receivable Net Of Deferred Income	[1]	$ 91,410,000		$ 91,410,000		$ 71,334,000
[1] Includes $6,156 and $2,874 of commercial leases at September 30, 2017 and December 31, 2016, respectively.

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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.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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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.

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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.

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