Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 69,504	$ 66,189
Unpaid Principal Balance Nonaccrual Loans	87,411	79,886
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	52,006	45,410
Unpaid Principal Balance Nonaccrual Loans	68,552	56,865
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	30	50
Unpaid Principal Balance Nonaccrual Loans	30	49
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	976	785
Unpaid Principal Balance Nonaccrual Loans	1,356	1,182
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,603	2,628
Unpaid Principal Balance Nonaccrual Loans	2,618	2,623
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,552	4,284
Unpaid Principal Balance Nonaccrual Loans	1,808	5,410
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	6,963	7,029
Unpaid Principal Balance Nonaccrual Loans	7,290	7,270
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	318	25
Unpaid Principal Balance Nonaccrual Loans	318	26
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	71	1,829
Unpaid Principal Balance Nonaccrual Loans	71	1,828
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	4,985	4,149
Unpaid Principal Balance Nonaccrual Loans	$ 5,368	$ 4,633