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Loans And Leases (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Dec. 31, 2018 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 598,695,000		$ 598,695,000		$ 550,683,000
Cash payments of interest	43,000	$ 48,000	88,000	$ 99,000
Loans 90 days or more past due and still accruing interest
Number of days of default payment			90 days
Total TDR's	3,111,000		$ 3,111,000		3,161,000
Allocated specific reserves to modified TDRs	20,000		20,000		22,000
Commitment to lend additional amounts	$ 0		$ 0		0
Number of loans modified as a TDR | loan	0	0	0	0
Number of TDRs in payment default | loan	0	0
Recorded investment of loans undergoing modifications, not TDRs	$ 15,821,000	$ 21,612,000	$ 15,821,000	$ 21,612,000
Accruing TDR's	3,018,000		3,018,000		3,061,000
Loans And Leases Receivable Net Of Deferred Income	605,724,000		605,724,000		557,695,000
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]
Accounts Notes And Loans Receivable [Line Items]
Average days			14 days
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	$ 131,517,000		$ 131,517,000		118,386,000
Single-Family Residential[Member] | Northpointe [Member] | Mortgage Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	40,572,000		40,572,000		36,845,000
Commercial Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivable Net Of Deferred Income	$ 146,450,000		$ 146,450,000		$ 126,887,000

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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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