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Loans (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) loan	Jun. 30, 2015 USD ($) item loan	Jun. 30, 2014 USD ($) loan	Dec. 31, 2014 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 284,160,000		$ 284,160,000		$ 257,085,000
Cash payments of interest	84,000	$ 51,000	166,000	$ 106,000
Loans 90 days or more past due and still accruing interest	0		0		0
Allocated specific reserves to modified TDRs	46,000		$ 46,000		64,000
Number of days of default payment			90 days
Total TDR's	5,417,000,000		$ 5,417,000,000		5,655,000,000
Accruing TDR's	5,030,000		$ 5,030,000		$ 5,233,000
Number of loans modified as a TDR | loan		0		0
Number of TDRs in payment default | loan			0	0
Recorded investment of loans undergoing modifications, not TDRs	4,575,000,000	$ 8,567,000,000	$ 4,575,000,000	$ 8,567,000,000
Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of participation agreement interest					80.00%
Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of participation agreement interest					95.00%
Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of loans risk rated for capital adequacy			100.00%
Northpointe [Member]
Accounts Notes And Loans Receivable [Line Items]
Ownership interest in each loan is participates			5.00%		20.00%
Home Equity Line of Credit [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	9,000		$ 9,000
Number of loans modified as a TDR | item			1
Single-Family Residential[Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	9,000		$ 9,000
Number of loans modified as a TDR | loan			1
Single-Family Residential[Member] | Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 37,644,000		$ 37,644,000		$ 24,996,000

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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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